Ashlar Pattern Paver Calculator – Modular Cut Counts
Free ashlar paver calculator for rectangle, L-shaped and circular patios, with an optional fire-pit or garden cutout. Enter your patio area and module to get exact counts of 6×18, 6×12 and 6×6 or large-format courses for an authentic rectangular ashlar layout.
Your Inputs
30 secLive Estimate
Ashlar repeats a fixed "module" of interlocking rectangles. This tool reports each size you need to order by module count — the module shapes stay the same whether your patio is 200 or 800 sq ft.
How Our Formulas Work
The calculator uses standard estimating assumptions for material volume, waste, coverage and ordering allowances. Actual quantities vary by material, supplier, site conditions and installation method. We use real material bulk densities and compaction coefficients, so your orders match actual site needs. ⌈x⌉ means rounded up to the next whole unit.
Patio Footprint
Worked example: Example: 24 ft × 18 ft = 432 sq ft of patio
Pro rule of thumb: For an L, add the two rectangles. For a circle, use half the diameter as the radius r.
Repeat Module Coverage
Worked example: Example: the 2-piece module = (6×18) + (6×6) = 108 in² + 36 in² = 1.0 sq ft
Pro rule of thumb: Each module repeats identically, so the long-to-short ratio holds at any patio size.
Completed Modules
Worked example: Example: ⌈(432 sq ft ÷ 1.0) × 1.12⌉ = 484 modules
Pro rule of thumb: Cut buffers: 1.08 clean rectangle, 1.12 standard field, 1.15 borders or curves.
Pieces per Size
Worked example: Example: 484 modules × 2 pieces = 968 pavers
Pro rule of thumb: The 2-piece is one long + one short; the 3-piece adds a mid-length 6×12 in every course.
Planning Estimate
Results are estimates based on the information and assumptions provided. Actual material quantities may vary with site conditions, material specifications, installation method, waste, and supplier measurements. For construction-critical decisions, verify quantities against your supplier's specifications and any local requirements before purchasing or building.
Cut buffer: 8% running bond → 20% curved / borders.
Crushed stone: +15% compaction allowance, ≈ 1.40 tons/yd³ loose bulk density.
Bedding sand: 50 lb bag ≈ 0.5 ft³, default 1″ screed bed.
Joint sand: one 50 lb bag ≈ 75 sq ft of 1/8″ joints.
Edge & fabric: 6 ft strips, spikes ≈ every 1.4 ft; fabric +10% for seams.
Prices: 2026 local-market averages (USD · CAD · GBP · EUR · INR · AUD · JPY) — override in "local prices".
Keep the Momentum Going
Your ashlar pattern is just one layer of the build. Try a related tool or jump back to the full material list.