Wallpaper Roll Calculator
Plan full-height wallpaper drops using wall height, combined width, roll dimensions and pattern repeat. Straight-match and conservative half-drop allowances affect how many complete strips fit in a roll. Spare drops are explicit rather than hidden in a percentage.
Your result
How the calculation works
Drops=ceil(combined wall width/roll width)+spares. Cut length=height+trim, rounded up to a pattern repeat for matched paper. Conservative half-drop adds half a repeat. Drops per roll=floor(roll length/cut length).
Worked example
For 10 m wall width, 2.4 m height, 0.1 m trim, 0.53 m × 10 m rolls and 0.64 m straight repeat, cut length is 2.56 m. Twenty required/spare drops need seven rolls at three drops per roll.
Assumptions and limitations
Doors and windows are not deducted because full strips may still be needed around them. Half-drop allowance is conservative and does not optimize alternating-roll cuts. At least one full drop must fit each roll.
Check the manufacturer’s pattern match, repeat and batch number. Add extra for difficult corners and future repairs, and use separate estimates when wall heights or products differ.
Sources and editorial responsibility
Maintained by Renvoro Pty Ltd. Sources inform the methods and assumptions shown here; outputs have the limitations described on this page.
Method reviewed 2026-10-13. Calculation standards · Report an issue