Paving Block Calculator
Find out how many paving blocks or slabs you need to cover an area.
–
blocks needed (including waste)
| Area to pave | – |
|---|---|
| Each block covers | – |
| Blocks before waste | – |
| Blocks per m² | – |
Paving block calculator
This calculator tells you how many paving blocks, bricks, or slabs you need to cover a given area. Enter the dimensions of the area you are paving and the size of a single block, add a waste allowance, and it returns the total number of blocks required — plus how many fit per square metre.
How it works
The tool divides the total area by the area of one block to find how many are needed, then adds your waste percentage to cover cuts, breakages, and the off-cuts you cannot reuse. A 5–10% allowance is sensible for a simple layout, and 10–15% for diagonal or herringbone patterns where there are more cuts.
Don’t forget the base layers
Paving needs a solid foundation: a compacted MOT Type 1 sub-base topped with laying sand. Work out the sub-base with our MOT Type 1 calculator and the overall area with the construction area calculator.
Frequently asked questions
How many 20 × 10 cm blocks per square metre?
Fifty blocks per square metre, since each covers 0.02 m². The calculator adjusts automatically for any block size you enter.
Disclaimer: Estimates only. Order a little extra and keep some spares for future repairs.