Introduction
These are the questions people ask most about estimating and planning paver projects — how many pavers, how much sand and base, what sizes to use, and what the Paver Calculator assumes. Each answer is short and practical; for the full worked math behind any of them, the complete guide walks through a 4 m × 3 m patio from tape measure to order.
Frequently Asked Questions
How many pavers do I need for a 4m × 3m patio?
With standard 200 × 100 mm pavers and a 7% cut allowance: 12 m² ÷ 0.02 m² = 600 pavers, × 1.07 = 642, round up to 650 pavers. You’d also need about 0.3 m³ of bedding sand, 1.56 m³ of loose base aggregate (100 mm compacted base × 1.3 compaction factor), and one 20 kg bag of polymeric joint sand.
What is the formula for calculating pavers?
Pavers = (Paved area ÷ Single paver area) × (1 + Waste%), rounded up. Both areas must be in the same units — square meters with square meters, or square feet with square feet. Joint gaps of 2–5 mm are absorbed into the waste allowance rather than measured per paver. The full derivation is in the formula-explained guide.
How much waste should I add to a paver estimate?
Five percent for a simple straight-laid rectangle; 7–10% for rectangles with corners or obstacles; 10–15% for diagonal 45° patterns, circles, curves, or radial layouts. The allowance covers edge cuts, breakage, and culling defective units — and the leftovers become spare stock for future repairs.
How much sand do I need under pavers?
Two different sands: bedding sand screeded to 25 mm (1 in) — paved area × 0.025 m gives cubic meters (a 12 m² patio needs 0.3 m³). Joint sand swept between pavers — roughly 0.5–1.5 kg per m² depending on joint width and paver thickness, rounded up to whole 20 kg bags of polymeric sand.
How much base aggregate do I need?
Paved area × compacted base depth × 1.3 compaction factor. For a 12 m² patio with a 100 mm base: 12 × 0.1 × 1.3 = 1.56 m³ loose. Typical compacted depths: 100 mm (4 in) for patios and walkways, 150–200 mm (6–8 in) for driveways. Skipping the 1.3 factor is the most common aggregate shortfall.
What size pavers should I use for a patio vs a driveway?
Patios and walkways commonly use 40–60 mm thick pavers; driveways need 60–80 mm thick units to handle vehicle loads. Face size (200 × 100 mm, 400 × 400 mm, etc.) is mostly aesthetic — the estimating formula works the same for any size. Thickness and base depth, not face size, carry the load.
Do I need edge restraints?
Yes. Interlocking pavers function as a system that relies on a fixed edge — spiked plastic edging or a concrete haunch — to maintain confinement under load. Without edge restraint, outer rows migrate and the whole field loosens. Estimate edging as the perimeter of the paved area.
How many pavers come on a pallet?
It varies widely by paver size and manufacturer — roughly 250–500 pieces for standard 200 × 100 mm pavers, fewer for large-format units. Check your supplier’s pallet quantity and round your order up to whole pallets when close; pallet pricing is usually cheaper per unit than loose pieces.
Can I lay pavers directly on soil or grass?
Not for a lasting result. Pavers need a compacted aggregate base and a screeded sand bed; laid directly on soil they settle unevenly within a season or two. Even a small garden path benefits from at least a thin compacted base.
Polymeric sand vs regular jointing sand — which should I use?
Polymeric sand contains binders that set hard when misted, resisting washout and weed growth — the better choice for most patios and driveways. Plain washed jointing sand is cheaper and fine for low-traffic areas but needs periodic topping up. The material guide compares them in detail.
How do I estimate pavers for a circular patio?
Calculate the circle’s area (π × radius²), divide by single paver area, and use a 10–15% waste allowance for the radial cuts. Alternatively, estimate the bounding square and multiply by 0.785 (π/4) to get the circle’s share. The estimating guide covers irregular shapes step by step.
Should I use metric or imperial in the calculator?
Use whichever matches how you measured — and whichever your supplier quotes in. The math is identical either way; the only requirement is consistency within a single calculation. The calculator reports both systems so you can cross-check.
How much does a paver patio cost?
Materials alone typically run $30–$80 per m² ($3–$7.50 per ft²) depending on paver type; professionally installed, expect $100–$250+ per m² all-in. These are illustrative ranges with wide regional variation — the cost guide builds a full worked budget.
How long do paver patios last?
A properly based paver pavement can last 25–50 years; individual pavers can be lifted and reset if settlement occurs, which is the material’s main advantage over a monolithic slab. Lifespan is determined far more by base quality than by paver brand.
Related Guides
- Complete Guide — the full estimating walkthrough.
- Formula Explained — every calculation derived step by step.
- Paver Material Guide — choosing pavers, base, and sand.
- Estimating Guide — measuring shapes and setting waste allowances.
- Cost Guide — turning quantities into a budget.
- DIY vs Pro — when to hire the work out.
Get Your Number
If your question wasn’t answered above, the quantities behind it come from the same four formulas — run your dimensions through the Paver Calculator and check the result against the complete guide’s worked example. For anything structural, drainage-related, or code-related, consult a licensed professional or your local building authority.
Disclaimer: Calculator results are planning estimates based on the dimensions you enter. Actual material requirements vary with site conditions, pattern choice, and supplier packaging. Verify quantities with your supplier and consult a licensed professional or your local building authority for structural, drainage, or code-related decisions.
