Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Fixed pile direction and straight rectangular room. Offcuts are not reused; pattern matching and seam restrictions excluded.
Example Calculation
- Room length along roll: 5 m
- Room width: 4 m
- Roll width: 3 m
- Trim at each strip end: 0.1 m
Room length along roll = 5 m; Room width = 4 m; Roll width = 3 m; Trim at each strip end = 0.1 m. Primary result: 10.4.
Frequently asked questions
How do I use this calculator?
Enter room length along roll, room width, roll width, trim at each strip end. The result updates automatically. Use Reset to restore the example values.
What method does it use?
strips=ceil(room width/roll width); roll length=strips ×(room length+2 trim).. Fixed pile direction and straight rectangular room. Offcuts are not reused; pattern matching and seam restrictions excluded.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.