Home & garden calculators
Material estimates for home and garden projects, with measurements, waste allowance and product coverage kept as inputs you control.
Every project here comes down to the same steps: measure the area or volume, add an allowance for cuts and waste, and round up to the packages you can actually buy. Each calculator shows those steps with your numbers in them.
Product figures — box coverage, coverage per litre, bag yield, stone density — change from one product to the next, so they stay as inputs. Read them off the label of the product you plan to buy.
Start with a question
Questions people arrive with, and the calculator that answers each one.
- How many boxes of flooring do I need for a 12 × 10 room?Flooring — whole boxes to buy →
- How many 12-inch tiles cover a 10 × 8 ft floor?Tile — tiles and boxes →
- How much paint do I need for two coats on four walls?Paint — gallons or litres and tins →
- How many bags of concrete for a 10 × 10 ft slab, 4 inches thick?Concrete — cubic yards and bags →
- How many bricks for a 20 ft garden wall?Brick — bricks to buy →
- How much mulch for a bed 3 inches deep?Mulch — cubic yards and bags →
- How many tons of gravel for a path?Gravel — volume and weight →