About Calculapedia

Calculapedia is a free collection of material and cost calculators for home and building projects. Whether you’re pouring a concrete slab, mulching a garden bed, or tiling a floor, our tools tell you exactly how much material to buy — and roughly what it will cost — in seconds.

Why we built it

Estimating materials usually means hunting for a formula, converting units, and second-guessing yourself at the store. We wanted a faster way: enter your measurements, get a clear answer with a sensible waste allowance built in, and get on with the project.

How the estimates work

Every calculator uses standard industry formulas and rounds up with a reasonable allowance for waste and offcuts, so you’re less likely to run short. Each one shows a worked example so you can see exactly how the number was reached.

Our estimates are for planning only — always confirm quantities with your supplier or contractor before buying.

Free to use, free to share

All calculators are free, with no signup. You’re welcome to embed any of them on your own website using the embed code at the bottom of each calculator page.