Order the right amount, every time.
Before you buy, know exactly how much material to get. Each tool does one job, runs instantly in your browser, and shows its math — so you stop over-ordering or running short.
Pick a tool, get your number
Purpose-built for the most common DIY concrete and gravel jobs around the house.
Why calculate before you buy?
Concrete and gravel are sold by the bag or the cubic yard, and most people guess. A slab an inch too thick or a driveway a foot too short wastes real money.
Exact quantities
Bags, cubic yards, or tons — precise numbers you can hand straight to the supplier, with waste already built in.
Math you can audit
Every tool shows its formula and assumptions, so you can verify the figure instead of trusting a black box.
Free & private
No accounts, no sign-up. Calculations run instantly in your browser and your inputs never leave your device.