Blinds Size Calculator
Inside or outside mount — measure once, order right.
- Free, no sign-up, works on any device.
- Instant results with a clear explanation of each step.
Figures are estimates from this calculator’s standard formula — adjust the inputs in the tool below for your exact number.
Blinds Size Calculator
Inside or outside mount — measure once, order right.
The windowMeasure the opening itself — steel tape, three passes per dimension.
top, middle and bottom — the smallest wins (old houses are not square)
left, center and right — the longest wins; a short blind leaves a light gap at the sill
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