Carpet Roll Layout Calculator
Plan full-width carpet cuts for one rectangular room, then see the measured, allowance-adjusted and supplier-rounded running-length purchase, seams, offcuts and optional local material cost.
Part of the Surfaces & Finishes calculators — see all tools in this category.
Carpet roll layout estimate
Turn one rectangular room into full-width carpet cuts, seam positions, ordered running length, and an optional local material-cost line.
Preparing calculator controls…
| Cuts | 1 full roll-width cut × 5 m |
|---|---|
| Seams | No seam required |
| Purchase layout | 4 m roll width × 5 m running length |
Current result
Order 20 m² of carpet: 4 m wide × 5 m purchased running length.
- Room floor (net)
- 15 m²
- Measured cut need
- 5 m
- After allowance
- 5 m
- Purchased stock
- 5 m
- Full-width cuts
- 1
- Offcuts and overlap
- 5 m²
Net is the measured room floor. Trim and pattern repeat determine each cut, then the ordering allowance is applied once to the combined cut need; supplier increment rounding happens once after that. Purchased carpet is fixed roll width × purchased running length and is the quantity used for the optional per-area price. Offcuts and seam overlap are purchased material, not extra floor coverage. A blank price is an incomplete purchase line, not $0.
- No pattern-repeat refinement is applied. Confirm the selected carpet’s pattern and installer direction.
- Offcuts are reported but are not reused in this single-room layout or credited against another cut.
- No seam is required for the selected roll width and orientation.
| Material | Net need | Order quantity |
|---|---|---|
| User-specified carpet roll | 15 m² (ordered) | 20 m² (ordered) |
No prices entered
Cost breakdown
No prices entered. This is not a completed zero-cost estimate.
| Line | Purchased quantity / unit / basis | Pricing state | Direct price | Entered line tax |
|---|---|---|---|---|
| Carpet | 20 m² (ordered) | Not priced | — | — |
- Direct priced subtotal
- $0.00
- Selected contingency base
- $0.00
- Contingency rate
- 0%
- Contingency amount
- $0.00
- Before-tax total
- $0.00
- Entered line tax
- $0.00
- Contingency tax (not entered)
- $0.00
- Final total unavailable — enter a price to begin the estimate
- —
Missing price categories: Carpet.
Cost by category
No entered prices to chart.
| Category | Cost | State |
|---|---|---|
| Carpet | Not priced | not-priced |
How it works and assumptions
Enter the room length and width, selected carpet roll width, and cut running direction. The calculator lays out full-width cuts across the room, adds trim, optionally rounds each cut to its pattern repeat, then applies allowance and supplier running-length rounding once. It reports combined purchased running length rather than treating carpet as generic floor area.
For finish-planning context, use the live Surfaces & Finishes Guide and the Carpet Roll Orientation, Seams & Waste guide.
Worked example
The calculator includes a separate 6 m × 4.5 m worked example with trim, overlap, allowance and supplier rounding so you can inspect cut and purchase arithmetic independently of the UAT case.