Interlock paving calculator — pavers, bedding and jointing sand
A 40 m² villa driveway in 200×100 pavers at 10% waste needs 2,200 pavers, 1.2 m³ of bedding sand and 7 bags of jointing sand. Enter your area below — metric only, the way Gulf interlock is specified — free, no signup.
Your quantities
How the pavers and sand are worked out
Pavers: each format covers a fixed number of pieces per square metre — 50 for the standard 200×100 mm paver, 25 for 200×200, 11.11 for 300×300 and 6.25 for 400×400. The calculator multiplies your area by that rate, adds your waste percentage for cuts and breakage, and rounds the count up to whole pavers.
Sand comes in two kinds. Bedding sand is the screeded bed the pavers sit on: its volume is the area multiplied by the bedding depth — 30 mm by default — and its weight is that volume at 1,600 kg per m³. Jointing sand fills the gaps: the calculator works out the total joint length per square metre from the paver's sides, (1 ÷ length + 1 ÷ width) in metres, takes the joint as 3 mm wide and 60 mm deep — the paver's thickness — and converts that volume to kilos at the same 1,600 kg per m³, then to 25 kg bags, rounded up.
Running these jobs? Landscaping & Garden
How to use the interlock paving calculator
- Measure the area to pave: length × width, in metres — one rectangle per section of driveway, yard or path.
- Choose the paver format: 200×100 mm is the standard Gulf driveway paver; larger formats suit terraces and light-traffic areas.
- Set the waste — 10% covers cuts at edges and breakage on a regular shape; allow more for curves and diagonal laying.
- Set the bedding sand depth: 30 mm is the standard screeded bed the calculator opens on.
- Read the order list: pavers to buy, bedding sand in cubic metres and tonnes, and jointing sand in kilos and 25 kg bags.
How many pavers and how much sand for a 40 m² driveway?
A 40 m² villa driveway in 200×100 mm pavers: at 50 pavers per m² the area takes 2,000 pavers before waste, and 10% waste for cuts and breakage brings the order to 2,200 pavers.
The bedding sand at the standard 30 mm depth is 40 × 0.03 = 1.2 m³, which weighs 1.2 × 1,600 = 1,920 kg — about 1.92 tonnes. The joints hold more than most people expect: joint length is (1 ÷ 0.2 + 1 ÷ 0.1) = 15 metres per m², so at 3 mm wide and 60 mm deep the jointing sand comes to 172.8 kg — 7 bags of 25 kg, rounded up.
Paver formats and assumptions the calculator uses
Interlock paver formats — pieces per square metre
| Paver format | Pieces per m² | Typical use |
|---|---|---|
| 200 × 100 mm | 50 | Driveways, parking and paths — the standard Gulf format |
| 200 × 200 mm | 25 | Patios, yards and garden paths |
| 300 × 300 mm | 11.11 | Terraces and courtyards |
| 400 × 400 mm | 6.25 | Light-traffic courtyards and pool decks |
Assumptions built into the sums
| Item | Assumption |
|---|---|
| Sand density | 1,600 kg per m³, for bedding and jointing sand alike |
| Bedding depth | Your depth — 30 mm standard, entered in the form |
| Joint width | 3 mm between pavers |
| Paver thickness | 60 mm — the depth the jointing sand fills |
| Waste | Your percentage, added to the pavers before rounding up |
| Jointing sand bags | 25 kg bags, count rounded up |
Paving notes from the trade
- Order all the pavers in one batch. Colour and shade drift between production runs, and a topped-up delivery can show as a patch across the finished driveway.
- Measure edge restraints and kerbs separately, by length. This calculator counts the paved area only — the edging that stops the field creeping is a separate line on the order.
- Screed the bedding sand loose, even and at one depth before laying. Dips and high spots in the bed print straight through to the finished surface once the pavers are compacted in.
- Brush the jointing sand in dry, compact, then brush again. Joints settle after the first compaction and the first wash-down, so topping them up once is part of the job, not a defect.
- Keep a small stack of spare pavers from the same batch when the job is done. A cracked paver years later is a five-minute swap only if its match is on site.
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How many 200×100 interlock pavers are in 1 m²?+
50 pavers. A 200×100 mm paver covers 0.02 m², so a square metre takes 1 ÷ 0.02 = 50 pieces before waste. The calculator adds your waste percentage and rounds the whole job up to whole pavers.
How many pavers do I need for a 40 m² driveway?+
2,200 pavers in the standard 200×100 mm format at 10% waste: 40 m² × 50 per m² = 2,000 pieces, plus 10% for cuts and breakage. The same driveway also takes 1.2 m³ of bedding sand and 7 bags of jointing sand.
How much bedding sand and jointing sand does interlock paving need?+
Bedding sand is the area multiplied by the bed depth: 40 m² at 30 mm is 1.2 m³, about 1.92 tonnes at 1,600 kg per m³. Jointing sand follows the joints — for 200×100 pavers at 3 mm wide and 60 mm deep it is 172.8 kg on the same 40 m², which is 7 bags of 25 kg.
Why is this calculator metric only?+
Because Gulf interlock is specified in millimetres and square metres: paver formats are sold as 200×100 mm and areas are measured and priced in m². The calculator stays in the units the material is actually bought in, so the count you read is the count you order.
What does this calculator not include?+
Quantities only — no prices and no labour. It does not count edge restraints or kerbs, and it does not work out the compacted base or sub-base gravel under the bedding sand; measure and order those separately. The quantities do not carry into InstaJack automatically yet.