Triangle sq ft calculator

board feet = length (ft) × width (in) × thickness (in) / 12. board feet = 8 × 10 × 1.25 / 12. board feet = 8.33 BF. Now, multiply this result by the number of pieces to obtain the total board footage of your purchase: 5 × 8.33 = 41.67 BF. Finally, you can multiply this value by the price per board foot to determine the total cost of your ...

Triangle sq ft calculator. Tank volume calculator online - calculate the capacity of a tank in gallons, litres, cubic meters, cubic feet, etc. Tank capacity calculator for on oil tank, water tank, etc. supporting 10 different tank shapes. Quick and easy tank volume and tank capacity calculation (a.k.a. tank size). Servers as a liquid volume calculator with output in US gallons, UK gallons, …

The area of any rectangular place is or surface is its length multiplied by its width. For example, a garden shaped as a rectangle with a length of 10 yards and width of 3 yards has an area of 10 x 3 = 30 square yards. A rectangular bedroom with one wall being 15 feet long and the other being 12 feet long is simply 12 x 15 = 180 square feet.

How to calculate the volume of a triangular prism? You need to take or know (from a plan/schematic) three length measurements. Make sure they are all in the same length unit, or convert accordingly until they are. The resulting output from our triangular prism calculator is always in cubic units: in 3, ft 3, yd 3, mm 3, cm 3, meters 3, etc.Oct 3, 2023 · Calculate the square footage of the deck: 12 ft × 12 ft = 144 ft². Choose the size of a single decking board, e.g., 8 ft long and 0.5 ft wide. Calculate the square footage of the decking board: 8 ft × 0.5 ft = 4 ft². Find the number of decking boards needed (plus 10% for waste): 144 ft² / 4 ft² × 1.1 = 40. Area = 200 sq. ft. Area of a Right Triangle Formula: Area = 1/2 (base x height).The online pond calculator does the conversions for you. All you need to do is select the desired units in the drop down option and the calculator will do the following conversions for you: $$1\,foot = 12\,inches = 0.33\,yards = 30.48\,centimeters = 0.3048\,meters$$ $$1\,ft^2 = 144\,in^2 = 0.111\,yd^2 = 929\,cm^2= 0.0929\,m^2$$The empirical rule calculator, also known as a "68 95 99 rule calculation", is a tool that allows you to determine the ranges that are either 1 or 2 standard deviations or 3 standard deviations. This calculator will show you the ranges in which 68, 95, or 99.7% of normally distributed data, respectively.The cost of a new roof can vary greatly depending on the type of material used. For homeowners with a 1200 sq ft home, it’s important to consider the cost of roofing materials in order to stay within budget.

Calculator Use. This online calculator will calculate the 3 unknown values of a sphere given any 1 known variable including radius r, surface area A, volume V and circumference C. It will also give the answers for volume, surface area and circumference in terms of PI π. A sphere is a set of points in three dimensional space that are located at ...Solving using the area of a triangle formula c 2 / (2 * (tanα -1 + tanβ -1 )) = 225 / (2 * (0.577350 -1 + 1.732051 -1 )) = 48.7 square feet. Obviously using both a tangent calculator and an exponent calculator is quite helpful. …Triangle angle calculator is a safe bet if you want to know how to find the angle of a triangle. Whether you have three sides of a triangle given, two sides and an angle or just two angles, this tool is a solution to your geometry problems. Below you'll also find the explanation of fundamental laws concerning triangle angles: triangle angle sum ...Calculate Rise, Pitch, Angle and Grade % from known Run. Visit this page on your Phone to directly measure pitch and angles. With a mobile device, a button will appear. Tap the button to start measuring and lay your device on an angle (roof) to measure pitch and angle and animate the diagram. While measuring, tap to hear the spoken angle ...Calculator Use. An isosceles triangle is a special case of a triangle where 2 sides, a and c, are equal and 2 angles, A and C, are equal. In our calculations for a right triangle we only consider 2 known sides to calculate the other 7 unknowns. For example, if we know a and b we know c since c = a.Enter the values of any two angles and any one side of a triangle below which you want to solve for remaining angle and sides. Triangle calculator finds the values of remaining sides and angles by using Sine Law. Sine law states that. a sin A = b sin B = c sin C. Cosine law states that-a 2 = b 2 + c 2-2 b c. cos (A) b 2 = a 2 + c 2-2 a c. cos ...Step 3: Convert Inches To Feet and Calculate Square Footage. Divide your measurements in inches by 12, which will convert your measurements into feet. Then, use our square footage calculator to find the area of your space’s shape. If you’ve divided a room into multiple shapes, remember to add up all of the shapes’ areas to find the room ...... triangle is 100 ft. and the height is 35 ft., the equation would be. Triangle area = (100x35) / 2 = 1750 sq. ft. Rectangular or Square area = L x W. Example ...

120 (Sq Ft) x 1.45 = 174 (Plants) ANNUALS & GROUNDCOVER SPACING The quantity of plants needed for a space depends on how far apart they will be planted. For many materials, this depends on mature size of the chosen annual, shrub or tree. However, with groundcovers, spacing also needs to take into account how long you are willing to wait …The Calculation. Enter the length. (feet + inches) Enter the width. (feet + inches) Enter the grid spacing. (inches) Enter the required splice (overlap) of your bars. (inches) Enter a waste factor, if required. (percentage)The Hypotenuse Calculator makes it easy to find the length of any hypotenuse (a hypotenuse is the longest side of a right triangle). All you have to do to use this free online Hypotenuse Calculator is to just enter in the length of side 1 and side 2 and then press the calculate button – that’s it! Try out this super easy to use math ...Simply enter the three side lengths, and the calculator will show the area result instantly. You can even try using the calculator to find a missing side length if you know the area and the other two side lengths: Enter a value for the area of the triangle. Input the other two known side lengths of the triangle.Jun 5, 2023 · To calculate the isosceles triangle area, you can use many different formulas. The most popular ones are the equations: Given leg a and base b: area = (1/4) × b × √ ( 4 × a² - b² ) Given h height from apex and base b or h2 height from the other two vertices and leg a: area = 0.5 × h × b = 0.5 × h2 × a. Given any angle and leg or base.

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How to calculate square feet for triangles. The square footage formula for triangles is: ... The landscaper uses the formula for calculating the square feet of a rectangle and performs the following calculations: A = 60 ft. x 80 ft. = 4,800 ft.2. The landscaper determines they need to buy enough fertilizer to cover 4,800 square feet of …Enter the given values.Our leg a is 10 ft long, and the α angle between the ladder and the ground equals 75.5°.. Ladder length, our right triangle hypotenuse, appears! It's equal to 10.33 ft. The angle β = 14.5° and leg b = 2.586 ft are displayed as well. The second leg is also an important parameter, as it tells you how far you should place …AboutTranscript. The area of a triangle is found by multiplying one half of the base by the height. In our example, the base is 18 and the height is 6. So, half of 18 is 9, and 9 times 6 equals 54 square units. Triangle area calculator - step by step calculation, formula & solved example problem to find the area for the given values of base b, & height h of triangle in different measurement units between inches (in), feet (ft), meters (m), centimeters (cm) & millimeters (mm).She determines the surface area of material she needs to create her hat with a radius of 1 foot and a height of 0.5 feet as follows: lateral SA = π × 0.4√ 0.4 2 + 0.5 2 = 0.805 ft 2. Cube. The surface area of a cube can be calculated by summing the total areas of its six square faces: SA = 6a 2 where a is the edge length Simply enter the three side lengths, and the calculator will show the area result instantly. You can even try using the calculator to find a missing side length if you know the area and the other two side lengths: Enter a value for the area of the triangle. Input the other two known side lengths of the triangle.

Calculator online for a the surface area of a capsule, cone, conical frustum, cube, cylinder, hemisphere, square pyramid, rectangular prism, triangular prism, sphere, or spherical cap. Calculate the unknown defining side lengths, circumferences, volumes or radii of a various geometric shapes with any 2 known variables. Online calculators and formulas for a surface area and other geometry problems.Calculate the square footage of the deck: 12 ft × 12 ft = 144 ft². Choose the size of a single decking board, e.g., 8 ft long and 0.5 ft wide. Calculate the square footage of the decking board: 8 ft × 0.5 ft = 4 ft². Find the number of decking boards needed (plus 10% for waste): 144 ft² / 4 ft² × 1.1 = 40.Using square footage formula, Area of a rectangle = Length × Breadth. Thus, are of each tile = 8 × 36 = 288 square inches. But, 1 square foot = 12 in × 12 in = 144 square inches. Thus, 288 square inches = 2 square feet. Hence, the area of each tile is 2 square feet.Sep 30, 2023 · When the number of sides, n, is equal to 3 it is an equilateral triangle and when n = 4 is is a square. The following formulas were used to develop calculations for this calculator where a = side length, r = inradius (apothem), R = circumradius, A = area, P = perimeter, x = interior angle, y = exterior angle and n = number of sides. SF circle = π * Radius * Radius. Where: π = 3.14159265359. Rhombus requires that the base and its height to be given: SF rhombus = Base * Height. Where: SF = square footage. 16 Apr, 2015. The Calculator. This square footage calculator finds the square footage of a house, room, property, lot or land with any of the following shape rectangle ...Area & Perimeter of a Square calculator uses side length of a square, and calculates the perimeter, area and diagonal length of the square. It is an online Geometry tool requires side length of a square. Using this calculator, we will understand the algorithm of how to find the the perimeter, area and diagonal length of a square. Need area for an irregular quadrilateral: 9' x 12" x 10'2" x 21' deck. Angle 90, AB 60, BC 91, CD 63, DA 78. As per calculation it comes to 5070 but your online calculator shows 5133.80. (If the quad'l is broken into a rectangle of 60 x 78 and a triangle of sides, 13, 60,63.The area of any rectangular place is or surface is its length multiplied by its width. For example, a garden shaped as a rectangle with a length of 10 yards and width of 3 yards has an area of 10 x 3 = 30 square yards. A rectangular bedroom with one wall being 15 feet long and the other being 12 feet long is simply 12 x 15 = 180 square feet.Directions: Enter any combination of feet and/or inches into the calculator below. You can use this square footage calculator to calculate siding square footage or any other square feet needed (like: roofing, carpet, etc.) You can also use this tool to convert feet to inches, convert inches to feet and calculate square inches. rectangle examples.

Calculate square footage, square meters, square yardage and acres for home or construction project. Calculate square feet, meters, yards and acres for flooring, carpet, or tiling projects. Enter measurements in US or metric units. How to calculate square footage for rectangular, round and bordered areas. Calculate project cost based on price per square foot, square yard or square meter.

This square footage calculator finds the square footage of a house, room, property, lot or land with any of the following shape rectangle, triangle, trapezoid, square, circle or …Sep 28, 2018 ... ... Triangle": base = int(input("Enter the value of base: ")) height ... Write a Python program to find area of i) Square, ii) Rectangle, iii) Circle.Answer to: A triangle has three sides: 1500 ft, 600 ft, and 1200 ft. Calculate the area of the triangle in acres. By signing up, you'll get...sq ft calculator - How to calculate square footage of an irregular shape https://www.squarefootagearea.com/calculator/square-footage-calculator/ |...Triangle. Calculate . Result. Area: ... Our calculator allows you to use both square and triangular patterns for the plants with equal coverage. ... feet by 50 feet ... Simply enter the three side lengths, and the calculator will show the area result instantly. You can even try using the calculator to find a missing side length if you know the area and the other two side lengths: Enter a value for the area of the triangle. Input the other two known side lengths of the triangle.This type of triangle can be used to evaluate trigonometric functions for multiples of π/6. 45°-45°-90° triangle: The 45°-45°-90° triangle, also referred to as an isosceles right triangle, since it has two sides of equal lengths, is a right triangle in which the sides corresponding to the angles, 45°-45°-90°, follow a ratio of 1:1:√ ... Enter the length and angle of any side of a triangle and get the area in sq ft. Learn the basic formula for triangle area, how to calculate it with different methods, and how to use it for equilateral triangles.

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If requested, after the calculation you can choose to make the conversion into other units. Below you can find a short list on how to convert the square footage: 1 acre = 43,560 square foot; 1 square yard = 9 square foot; 1 square meter = 10.76 square foot; 1 square inch = 0.00064516 square foot. 25 Mar, 2015.Keisan English website (keisan.casio.com) was closed on Wednesday, September 20, 2023. Thank you for using our service for many years. Please note that all registered data will be deleted following the closure of this site.Calculate the square footage of the deck: 12 ft × 12 ft = 144 ft². Choose the size of a single decking board, e.g., 8 ft long and 0.5 ft wide. Calculate the square footage of the decking board: 8 ft × 0.5 ft = 4 ft². Find the number of decking boards needed (plus 10% for waste): 144 ft² / 4 ft² × 1.1 = 40.Enter the values of any two angles and any one side of a triangle below which you want to solve for remaining angle and sides. Triangle calculator finds the values of remaining sides and angles by using Sine Law. Sine law states that. a sin A = b sin B = c sin C. Cosine law states that-a 2 = b 2 + c 2-2 b c. cos (A) b 2 = a 2 + c 2-2 a c. cos ... The Square Footage Calculator estimates the square footage of a lot, house, or other surfaces in several common shapes. If the surface is complex in shape, it may be …When the number of sides, n, is equal to 3 it is an equilateral triangle and when n = 4 is is a square. The following formulas were used to develop calculations for this calculator where a = side length, r = inradius (apothem), R = circumradius, A = area, P = perimeter, x = interior angle, y = exterior angle and n = number of sides.Take the total square footage of your space and multiply it by .10. Formula: Total square footage x .10 = amount you need to add. Example: 2017.35 square feet x .10 = 201.7 square feet. Take the number you get from the step above and add it to the total square footage of the space you’re working with.If you have a floor of 20 feet long and 25 feet wide, the square foot calculator can be used to measure the wall. The floor will be 500 square feet. If the measurement of one tile is 20 square feet, the area of the floor will be divided by 20. A floor with 500 square feet area will take 25 tiles (20 square feet each) to cover the whole floor. 2. Triangle Calculator 17+. Right angle triangle solver. Kent Johansson. Designed for iPad. Free. iPad Screenshots. Additional Screenshots. iPhone. Description. A ...Directions: Use the calculator above to calculate a triangle's square footage. You can enter feet only, inches only or a combination of the two. *Square Footage is also known as (a.k.a) square feet, square ft, SqFt, Sq.Ft., sq.ft., ft2 & ft 2. **This Calculator also calculates triangle square inches, the triangle's total Height in feet, total ... Jul 26, 2023 · h = a × √3 / 2. Substituting h into the first area formula, we obtain the equation for the equilateral triangle area: area = a² × √3 / 4. 2. Using trigonometry. Let's start with the trigonometric triangle area formula: area = (1/2) × a × b × sin (γ), where γ is the angle between the sides. We remember that all sides and all angles ... ….

You can use these calculations to determine that here. Use this calculation to calculate the area of a square or a rectangle. This calculation will calculate the area of a circle using either the diameter, the radius or the circumference as input. Calculate the area of a (right-angled) triangle with this calculation.Calculation. Enter the length of the wall. (feet+inches) Enter the rise of the roof pitch (rise/12) Enter the length of the board. (inches) Enter the exposed face of the board. (inches + fraction) Enter a waste factor if required. (percentage) Results. The square footage of your Gable. Amount of siding in lineal feet needed to cover the Gable.Please follow these basic instructions to use this calculator: 1. In field one, labeled “Side 1,” enter the length, in feet, of the first side of the triangular prism. A decimal can be used if the measurement is not a whole number. Examples: If the length is eight feet, enter “8”. If the length is one foot, nine inches, enter “1.75”.An easy to use, free area calculator you can use to calculate the area of shapes like square, rectangle, triangle, circle, parallelogram, trapezoid, ellipse, octagon, and sector of a circle. Formulas, explanations, and graphs for each calculation. Area of a triangle calculation using all different rules, side and height, SSS, ASA, SAS, SSA, etc.Directions: Use the calculator above to calculate a triangle's square footage. You can enter feet only, inches only or a combination of the two. *Square Footage is also known as (a.k.a) square feet, square ft, SqFt, Sq.Ft., sq.ft., ft2 & ft 2. **This Calculator also calculates triangle square inches, the triangle's total Height in feet, total ...Enter feet in whole numbers. Enter inches in mixed numbers, whole numbers or fractions in the following formats: Mixed numbers as 1 1/2 which is one and one half or 25 3/32 which is twenty five and three thirty-secondths. Keep exactly one space between the whole number and the fraction. Fractions as 3/4 which is three fourths or 3/100 which is ...Enter the land width (in feet) in a box below Acre Calculator. Enter the land length (in feet) in the space below the first box. Click the Calculate button. You can use the Acre Calculator to find the square footage in a property that has uneven lengths or widths. For example, a parcel that is 70 feet wide but has a length of 160 feet on one ...If you are human, leave this field blank. Calculate. Copyright 2023 – Calculator.devUse the calculator above to calculate a triangle's square footage. You can enter feet only, inches only or a combination of the two. **This Calculator also calculates triangle square inches, the triangle's total Height in feet, total Height in inches, total length in feet and total length in inches. Triangle sq ft calculator, board feet = length (ft) × width (in) × thickness (in) / 12. board feet = 8 × 10 × 1.25 / 12. board feet = 8.33 BF. Now, multiply this result by the number of pieces to obtain the total board footage of your purchase: 5 × 8.33 = 41.67 BF. Finally, you can multiply this value by the price per board foot to determine the total cost of your ..., Area of Triangle (A): The calculator returns the area in square feet (ft2). However, this can be automatically converted to other area units (e.g. square meters) via the pull-down …, Free Triangles calculator - Calculate area, perimeter, sides and angles for triangles step-by-step, This calculator completes the analysis of an irregular triangle given any three inputs. Please input only three values and leave the values to be calculated blank. In the case where two solutions to the same inputs are possible this calculator will give the two solutions. The triangle area is also calculated., Area of Triangle (A): The calculator returns the area in square feet (ft2). However, this can be automatically converted to other area units (e.g. square meters) via the pull-down menu. The Math / Science The formula for the area of a triangle base on the length of its threeside is: `A = sqrt((a+b+c)/2((a+b+c)/2-a)((a+b+c)/2-b)((a+b+c)/2-c))`, 120 (Sq Ft) x 1.45 = 174 (Plants) ANNUALS & GROUNDCOVER SPACING The quantity of plants needed for a space depends on how far apart they will be planted. For many materials, this depends on mature size of the chosen annual, shrub or tree. However, with groundcovers, spacing also needs to take into account how long you are willing to wait …, Take a tour of the Midwest Gardens. An educational outdoor classroom open to customers and trade professionals during business hours. We have tools at your fingertips to plan the garden or yard of your dreams. With a plant calculator, you can figure out just how many plants you need., Oct 19, 2021 ... ... feet, so the square footage of the room is 113.1 square feet (3.1416 x 6 x 6 = 113.1). Triangular. Triangle Area Calculator. Base (in feet), This type of triangle can be used to evaluate trigonometric functions for multiples of π/6. 45°-45°-90° triangle: The 45°-45°-90° triangle, also referred to as an isosceles right triangle, since it has two sides of equal lengths, is a right triangle in which the sides corresponding to the angles, 45°-45°-90°, follow a ratio of 1:1:√ ... , How to Calculate Your Turf Grass Needs. Divide your yard into simple geometric shapes-rectangles, circles or triangles, and total their square footage., Free Quadrilaterals calculator - Calculate area, perimeter, diagonals, sides and angles for quadrilaterals step-by-step ... Triangles. General. Area & Perimeter; Sides & Angles; Equilateral. Area & Perimeter; Sides; Isosceles Triangle. ... Square. Correct Answer :) Let's Try Again :(Try to further simplify. Verify Related., Given triangle area. The well-known equation for the area of a triangle may be transformed into a formula for the altitude of a right triangle: a r e a = b × h / 2. \mathrm {area} = b \times h / 2 area = b ×h/2, where. b. b b is a base, h. h h – height; and. So., To calculate the square footage of a rhombus, you can use the following formula: A = distance from one pair of opposite angles x distance from the other pair of opposite angles. In this equation, "A" is the area of the rhombus in square feet and the distances from both pairs of opposite angles are in feet., You need to apply the Pythagorean theorem: Recall the formula a² + b² = c², where a, and b are the legs and c is the hypotenuse. Put the length of the legs into the formula: 7² + 9² = c². Squaring gives 49 + 81 = c². That is, c² = 150. Taking the square root, we obtain c = 11.40., An easy to use, free perimeter calculator you can use to calculate the perimeter of shapes like square, rectangle, triangle, circle, parallelogram, trapezoid, ellipse, octagon, and sector of a circle. Formulas, explanations, and graphs for each calculation. Perimeter of a triangle calculation using all different rules: SSS, ASA, SAS, SSA, etc. , Determine the width and length. Length can also be height. If your width and length are not measured in feet convert measurements into feet. For inches divide by 12. For yards multiply by 3. For centimeters multiply by 0.03281. For meters multiply by 3.281. Finally, multiply Length (ft) x Width (ft) = Square Footage., Enter the land width (in feet) in a box below Acre Calculator. Enter the land length (in feet) in the space below the first box. Click the Calculate button. You can use the Acre Calculator to find the square footage in a property that has uneven lengths or widths. For example, a parcel that is 70 feet wide but has a length of 160 feet on one ..., The area of any rectangular place is or surface is its length multiplied by its width. For example, a garden shaped as a rectangle with a length of 10 yards and width of 3 yards has an area of 10 x 3 = 30 square yards. A rectangular bedroom with one wall being 15 feet long and the other being 12 feet long is simply 12 x 15 = 180 square feet., "Obtuse" describes a triangle that comprises: 1x angle that measures over 90 degrees (>90°), called an obtuse angle; and; 2x angles that measure less than 90 degrees (<90°), called the acute angles.; The obtuse triangle is one of two types of oblique triangles - the other one is acute., Step 1: Calculate Area. Calculate the surface area that requires tiling by multiplying the length and width of the project area. Step 2: Calculate Tile Size. Be sure to add the grout size to the length and width here, then multiply the two figures. Divide it all by 144 to convert it to square feet. Step 3: Divide by Tile Size, 1 acre = 43,560 square foot 1 square yard = 9 square foot 1 square meter = 10.76 square foot 1 square inch = 0.00064516 square foot Calculating Cost Per Square Foot. When painting a house, installing flooring, or building a home, the square footage of the property is often used to determine the cost or materials to be used. Painting a house: , Step 1: Multiply the given measurements in yards. Volume = length x width x height. = 12 yd x 6 yd x 9 yd. = 648 yd 3. Step 2: Multiply the result by 27 to convert it into feet. = 648 x 27 ft 3. = 17496 ft 3. , Find out area of triangle easily with our free triangle area calculator! You can calculate with base and height, three different sides and many more. Works with angles and radians!, Using the square feet of a triangle calculator is easy! Follow these steps: Select the triangle type from the drop-down list. You can find the square feet of triangles of these types: base and height; Three sides ( SSS ); Side-angle-side ( SAS ); and Angle-side-angle ( ASA ). Enter the measurements of the triangle type you've selected., Then add at least four feet for waste. Remember, the longer the cut, the more the waste. For a shape like a circle, pentagon, hexagon, or octagon, find 25% of the width and measure the length at that point. Add at least six feet for waste. No calculator can tell how much waste will be on each run plywood., Calculate easily the geometric properties of a regular hexagon. ... there are 4 triangles. Since he sum of internal angles in one triangle is 180°, 4 triangles, side by side, should measure up to …, This tool is designed to find the sides, angles, area and perimeter of any right triangle if you input any 3 fields (any 3 combination between sides and angles) of the 5 sides and angles available in the form. The algorithm of this right triangle calculator uses the Pythagorean theorem to calculate the hypotenuse or one of the other two sides ... , Oct 19, 2021 ... ... feet, so the square footage of the room is 113.1 square feet (3.1416 x 6 x 6 = 113.1). Triangular. Triangle Area Calculator. Base (in feet), Our calculator determines the area of your polygon and, as a bonus, its perimeter. The results will appear below the list of vertices. If you want our irregular polygon area calculator to determine the results with higher precision, go to the advanced mode. By default, the calculator displays 4 sig figs., Take the total square footage of your space and multiply it by .10. Formula: Total square footage x .10 = amount you need to add. Example: 2017.35 square feet x .10 = 201.7 square feet. Take the number you get from the step above and add it to the total square footage of the space you’re working with., Regularly: $431.00 On Sale! Save 20% on this popular package of ferns! This combination gives vivid color coverage throughout the season in zones 3/4-9. In stock. Our plant calculator makes it simple to calculate how many plants you need, spacing, coverage, ... so your landscaping project comes out perfect! , The area of any rectangular place is or surface is its length multiplied by its width. For example, a garden shaped as a rectangle with a length of 10 yards and width of 3 yards has an area of 10 x 3 = 30 square yards. A rectangular bedroom with one wall being 15 feet long and the other being 12 feet long is simply 12 x 15 = 180 square feet., First, measure the landscape bed length and width in inches. Use our feet to inches conversion tool to convert a measurement in feet to inches. Divide the width by the spacing to get the number of columns then divide the length by the spacing to get the number of rows. Finally, multiply the rows by the columns to find the number of plants needed.