Paving calculator
Work out how many paving slabs or block pavers you need for a patio, path or drive.
Uses only the sizes you enter.
Show the workings
| Step | Sum | Answer |
|---|---|---|
| Space each slab takes, with its joint | 0.61 m × 0.61 m | 0.372 m² |
| Slabs in a square metre | 1 ÷ 0.3721 | 2.687 slabs |
| Slabs for the area | 20 m² × 2.687 | 53.749 slabs |
| Rounded up | 53.749 | 54 slabs |
Where the figures come from
This sum uses only the numbers you entered.
How to work out paving
Work out the patio's area, then divide by the area each slab takes up with its joint. A 5 m by 4 m patio in 600 mm square slabs with 10 mm joints needs 20 ÷ (0.61 × 0.61) = 53.75, so 54 slabs before cuts.
For block paving, enter one block's size. Many block pavers are laid with very narrow joints: the maker's guide gives the joint to use. Paving is often sold by the square metre or in packs: check how much a pack covers.