What Is a Sod Calculator?
A sod calculator tells you how much sod (rolled grass turf) to buy to cover a lawn area. It multiplies the area you want to cover by a small waste factor to account for cutting around curves, edges, and obstacles, then converts that figure into the number of rolls or pieces you need to order.
How to Use It
Measure the area you want to sod in feet. Enter the length and width. Add a waste percentage — 5% is a good default for a simple rectangle, while irregular or curved areas may need 10% or more. Finally, enter the coverage per roll (often listed by your supplier; a typical roll covers about 10 sq ft, while big slabs cover more). The calculator returns total square feet, square yards, and the number of rolls rounded up.
The Formula Explained
First the base area is found: \(\text{Area} = \text{Length} \times \text{Width}\). Then waste is added: \(\text{Sod} = \text{Area} \times \left(1 + \frac{\text{Waste\%}}{100}\right)\). Rolls are computed as \(\text{Sod} \div \text{Coverage}\), rounded up because you can only buy whole rolls. Square yards are simply square feet divided by 9.
$$\text{Sod Needed} = (\text{Length} \times \text{Width}) \times \left(1 + \frac{\text{Waste\%}}{100}\right)$$
$$\text{Rolls} = \left\lceil \frac{\text{Sod}}{\text{Coverage}} \right\rceil$$
Worked Example
For a 30 ft × 20 ft lawn with 5% waste and 10 sq ft per roll: Area = 600 sq ft,
$$\text{Sod} = 600 \times 1.05 = 630 \text{ sq ft} = 70 \text{ sq yd}$$
$$\text{Rolls} = \lceil 630 \div 10 \rceil = 63 \text{ rolls}$$
FAQ
How much waste should I add? Use 5% for square lawns, 10–15% for areas with many curves, slopes, or obstacles.
How is sod sold? Often by the roll, slab, or pallet. Check your supplier's coverage per piece and enter it here.
Why round up the rolls? Suppliers sell whole pieces, so any fractional roll means you need one more.
