One of the most important steps in re-seeding or re-sodding a lawn is laying the appropriate amount of topsoil. The purpose of topsoil is to spread a layer of nutrient rich soil that provides the proper growth environment for new grass seeds and sod. Topsoil is applied to a depth of approximately three to six inches depending on the grade of the yard. Calculating the amount of topsoil to purchase for a new lawn isn't hard as long as you use accurate yard measurements to start with.
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Things you need
- Measuring tape
Use a measuring tape to measure the entire length of the yard (in feet). Make note of the length measurement.
Use a measuring tape to measure the entire width of the yard (in feet). Make note of the width measurement.
Convert the depth of the topsoil to a fraction of 12. Topsoil should be applied at a minimum depth of three inches, although it can be applied up to six inches deep. To convert this to a fraction of 12, simply place the number over 12. For example, a topsoil depth of three inches would be converted to a fraction as follows: 3/12. Using a calculator, divide 3 by 12 to arrive at a percentage of 0.25.
Multiply the width of the lawn by the length of the lawn and the depth of the topsoil (width x length x depth). For example, if the lawn is 120 feet by 130 feet and you want to apply three inches of topsoil, use the following calculation: 120 x 130 x 0.25 This calculation tells you how many cubic feet of topsoil is needed for the lawn.
Since topsoil is sold by the yard, you must convert the cubic feet number into cubic yards. To do this, divide the total cubic feet by 27.
Add three to five additional yards to the final number to account for spillage and you will have the total amount of topsoil needed to apply to the new lawn.
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