All 12 building calculators on QuickCalcHub, free, instant, no signup.
Every calculator here splits along the same line, and knowing which side a number falls on saves more money than any formula. Geometry is exact. If you measure a slab 20 ft by 20 ft and 4 in deep, it contains 4.94 cubic yards, there is no estimate in that, it is arithmetic. Material properties are not. How much that yard weighs, how many bags it takes, how far a gallon spreads: those depend on the product you actually buy, and they vary.
So the calculators here always give you the exact geometric answer, and where a conversion factor is needed they either take it from a published source and say which one, or they ask you for the number off your own supplier’s spec sheet. Where a published figure is a range, paint coverage, most obviously, the page offers the range rather than pretending to one value.
| What you are estimating | Use |
|---|---|
| Concrete for a slab, footing or pad | Concrete Calculator |
| Steps from a total rise, with IRC limits | Stair Calculator |
| Gravel for a driveway or path | Gravel Calculator |
| Mulch for beds, in yards or bags | Mulch Calculator |
| Soil or topsoil for a bed or raised bed | Soil Calculator |
| Stone or crushed aggregate by volume | Stone Calculator |
| Bricks for a wall, by brick size and joint | Brick Calculator |
| Paint, by area and number of coats | Paint Calculator |
| Tiles for a floor, wall or backsplash | Tile Calculator |
| Rebar grid for a slab | Rebar Calculator |
Every result on these pages is a bare minimum, and no experienced trade orders the bare minimum. Sub-grade is not flat, forms spread, material compacts, cuts generate scrap, and a second batch is rarely an exact colour match. Five to ten percent over is normal for bulk material; tile and brick, where offcuts are scrap, run higher.