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.
- Straight-match pattern only; no half-drop staggering. Openings are not deducted and leftover strips are not reused.
Example Calculation
- Total wall width: 10 m
- Wall height: 2.5 m
- Roll width: 0.5 m
- Roll length: 10 m
- Vertical pattern repeat: 0.3 m
- Trim per drop: 0.1 m
10 m wall width needs 20 half-meter drops. A 2.6 m raw drop rounds to 2.7 m; three fit per 10 m roll, requiring seven rolls.
Frequently asked questions
How do I use this calculator?
Enter total wall width, wall height, roll width, roll length, vertical pattern repeat, trim per drop. The result updates automatically. Use Reset to restore the example values.
What method does it use?
drops=ceil(width/roll width); cut length=height+trim rounded up to full repeats; rolls=ceil(drops/floor(roll length/cut length)).. Straight-match pattern only; no half-drop staggering. Openings are not deducted and leftover strips are not reused.
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.