Inputs
Adds 5% waste at 45°.
General allowance for cuts and spares.
Patio sections
| # | Length | Width | Remove |
|---|---|---|---|
| 1 |
ft
|
ft
|
Modeling an L-shape? Use multiple rectangles and sum areas.
in
in
in
Increases effective module size.
in
in
t/m³
Typical compacted aggregate ~1.8–2.1 t/m³.
m²/bag
At the reference joint width below.
mm
Extra fabric to overlap seams.
Results
US
Total area: 0.00 m² (0.00 ft²)
Perimeter (edges): 0.00 m (0.00 ft)
Effective paver module: —
Pavers needed: 0 (incl. waste)
Packs needed: 0
Base volume: 0.00 m³ (0.00 yd³)
Base weight: 0.00 t (0.00 US tons)
Bedding sand volume: 0.00 m³ (0.00 yd³)
Jointing sand bags: 0
Geotextile fabric: 0.00 m²
Example data
| Parameter | Example | Notes |
|---|---|---|
| Sections | 20×12 ft; 10×6 ft | Two rectangles, typical patio plus step-out. |
| Paver module | 8×4 in with 1/8 in joint | Effective module increases by joint width. |
| Waste | 10% + 5% at 45° | Extra allowance for diagonal layout. |
| Base depth | 8 in | Adjust for soil and loading. |
| Bedding sand | 1 in | Screeded leveling layer. |
| Jointing sand coverage | 9 m²/bag @ 3 mm | Adjust for your joint width. |
| Pack size | 480 pavers | Round up to whole packs. |
Values are illustrative—always verify manufacturer specifications.
Formulas used
- Section area:
A_i = L_i × W_i; total areaA = Σ A_i. - Effective module:
M_L = pL + j,M_W = pW + j, paver areaA_p = M_L × M_W. - Pavers needed:
N = ⌈ A / A_p × (1 + w/100 + a/100) ⌉, wherewis waste%,ais angle adder (0 or 5). - Packs:
P = ⌈ N / S ⌉, whereSis pack size. - Perimeter:
Per = Σ 2 × (L_i + W_i)(rectangular approximation). - Layer volumes:
V = A × depth. Convert depths to meters. - Weight:
W_t = V × ρ, densityρin t/m³; US tons= W_t × 1.10231. - Joint sand bags:
B = ⌈ A × (j / j_ref) / C ⌉, coverageCin m²/bag at jointj_ref. - Geotextile area:
A_geo = A × (1 + overlap/100).
How to use this calculator
- Select your unit system and desired pattern angle.
- Add one or more rectangular sections representing your patio footprint.
- Enter paver size and intended joint width to set the module.
- Provide base and bedding depths, density, and a reasonable waste allowance.
- Optionally set pack size and joint-sand coverage to round to real products.
- Review results, then export the summary as CSV or PDF for records.
Always confirm depths, densities, and coverage rates with local standards and manufacturer datasheets.
FAQs
For simple rectangles, 5–10% is common. Diagonal or intricate patterns benefit from an additional 5–10%. Local cutting skill and on‑site breakage also affect this allowance.
The area itself is unchanged, but diagonal layouts typically increase offcut waste. This tool adds a 5% adder at 45°, which you can override via the extra waste field.
Yes, but this simple module assumes a repeating effective size. For multi‑size patterns, approximate with the average modular area or split the patio into zones per module.
They are geometric estimates before compaction. Real quantities depend on compaction, moisture, and grading. Many contractors add 5–15% to cover variability and site conditions.
Yes. Wider joints increase the effective module, slightly reducing paver count. This tool includes joint width in the module area and scales joint‑sand bags by width.
All discrete items round up to whole units. Pavers round up to the next whole piece; packs and sand bags round up to whole packages for practical ordering.