Verify the inputs
Measure or document each input. If a value is only an estimate, record its source and test a conservative alternative.
Construction/ CALCULATOR
Wallpaper drops with straight pattern matching
Count complete strips per roll instead of assuming every square metre can be used.
FROM ESTIMATE TO ACTION
Use the result, not just the number.
Keep the calculation traceable
Save the input link or copied result together with the date, units and assumptions. A number without its inputs cannot be checked later.
Confirm the decision
Compare the estimate with the related guide, current product data and requirements that apply at your location before buying or building.
Inputs to verify
- Width of one wall (m)
- Calculate separate walls separately: each may need a partial-width strip.
- Maximum wall height (m)
- Measure several positions and use the tallest part.
- Actual roll length (m)
- Use the continuous length supplied, not a nominal single-roll area.
- Usable roll width (m)
- Check whether the product needs edge trimming.
- Vertical straight-match repeat (m)
- Enter zero for free match. Offset/drop match and murals are not supported.
- Combined top and bottom trim (m)
- Total trim for one strip, not an allowance at each end.
- Alignment loss at the start of each roll (m)
- Measure the loss to reach the chosen pattern start; zero only if none is needed.
- Additional complete spare strips (strips)
- Add an explicit reserve for damaged strips or later repairs.