Practical guide
How to Calculate Paving Bricks for a Driveway or Patio
Calculate paving bricks by multiplying net area by the product’s installed coverage. Add one waste allowance, then round up units and full packs. Measure the surface first and confirm the product details before placing an order.
Updated 15 October 2026
Reviewed by the 99Tools team. Editorial and corrections policy.
How to use the paving bricks calculator
Choose measured area when you already know the total in m². Otherwise enter the number of identical rectangles, their length and width. Add the measured areas of unequal sections before using area mode. Deduct untiled islands or other unpaved surfaces once across the whole project. Do not deduct an area already excluded from your measurement.
Paving calculation formulas
Net area = gross area − unpaved deductions. Raw pavers = net area × installed pavers per m². Required pavers = raw pavers × (1 + waste/100), rounded up. If buying full packs, divide the required quantity by pavers per pack and round up again. Waste is applied before the first rounding.
Interlocking paving bricks calculator
Choose supplier coverage for shaped or interlocking pavers. The starting value of 50 pavers/m² is an editable example, not a universal rate. Installed coverage can include the intended joint arrangement. Do not add a second gap allowance to an already published laying rate. Rectangular dimensions mode is a geometric alternative for plain rectangular units only.
Worked example: driveway quantity
For an 8 m × 4 m driveway, gross area is 32 m². With no deductions, example coverage of 50 pavers/m² and 7.5% waste, the requirement is 1,720 pavers. If your quoted packs contain 500, buy four packs supplying 2,000 pavers. The pack count is hypothetical; use your actual quote.
Thickness, bedding and perimeter
Paver thickness does not change coverage when top-face geometry and laying arrangement are unchanged. It still matters for suitability. Bedding volume is net area × specified depth in metres, not loose delivery volume. In rectangle mode, the perimeter sums all rectangle boundaries, including shared boundaries. Area-only mode cannot determine a perimeter. Measure actual edge restraints separately.
Before you order
The example waste and bedding depth are editable planning inputs, not a paving design specification. Confirm base preparation, drainage, load suitability, edge restraints, jointing material, colour batch, returns and delivery with your installer and supplier. The estimate excludes sub-base quantities, jointing sand, kerbs, labour, live prices and structural design.
Use the related calculators
Apply the explanation above with your own figures. Open a calculator below, check every input and review the result assumptions before making a decision.
Frequently asked questions
How many paving bricks do I need per m²?
Use the installed coverage for your selected product. A 200 × 100 mm rectangle with no additional gap gives 50 units/m² geometrically, but shaped products and joint arrangements can differ.
Can I use this as an interlocking paving bricks calculator?
Yes. Select supplier coverage and enter the manufacturer’s installed pavers per m². Do not calculate a shaped interlocker from its rectangular bounding dimensions.
Is this the Cashbuild paving bricks calculator?
No. This is an independent 99Tools calculator. You can enter product coverage and pack quantities from a Cashbuild quote or another supplier.
How many paving bricks are in a pallet?
There is no universal pallet quantity. Enter the count on the exact product quote, or enter zero for individual-unit purchasing.
Does the calculator include sand and installation costs?
It shows installed bedding volume at your entered depth. It does not calculate loose sand delivery, jointing sand, installation charges or a complete paving budget.