YardMaths is a small collection of free calculators for people planning yard, garden and landscaping projects. The goal is simple: tell you how much material to buy so you do not run short, and do not pay for a pile you never use.
How we calculate
Every calculator uses plain, standard geometry. Area comes from the shape you pick, volume is area multiplied by depth, and one cubic yard is 27 cubic feet (0.7646 cubic meters). Weight comes from a density you can change, and bag, roll, pallet and seed counts are always rounded up to whole units so the estimate never undershoots. The formulas and a worked example are written out on each calculator page.
Assumptions we state openly
Material weights, bag sizes, pallet sizes and seeding rates differ between suppliers and products. We use common planning values, show them in the calculator, and let you edit them. When your supplier or seed bag gives a different number, use theirs.
Testing
The calculation code is covered by an automated test suite that checks known cases, such as a 10 ft × 10 ft area at 3 inches deep equalling 25 cubic feet or 0.926 cubic yards, and metric inputs against imperial results.
Free and private
The calculators are free, need no account, and run entirely in your browser. See the privacy policy for details. Questions or suggestions are welcome on the contact page.
Our calculators
- Gravel CalculatorCubic yards, tons and bags of gravel for driveways, paths and patios.
- Cubic Yard CalculatorTurn length, width and depth into cubic yards, cubic feet and cubic meters.
- Topsoil CalculatorHow much topsoil for a lawn, garden bed or raised bed, in yards, tons and bags.
- Sod CalculatorSq ft, rolls and pallets of sod for your lawn, with a waste allowance.
- Mulch CalculatorCubic yards and bags of mulch for beds, borders and tree rings.
- Grass Seed CalculatorPounds of grass seed for a new lawn or overseeding, by seed type.