Blind Size Calculator
Estimate recess or face-fit blind order dimensions using measured opening size and chosen deductions or overlaps.
Typical use: Roller blinds, venetian blinds and other made-to-measure window coverings
Using this calculator
Open the interactive calculator to enter your project measurements and adjust the available settings. Review the calculated quantity and buying units before ordering materials. Check product coverage, pack sizes and installation guidance with the manufacturer or supplier.
Planning and practical guidance
How to Measure for Blinds: Recess vs Exact Fit
Measure correctly for inside-recess or face/exact-fit blinds and avoid the common mistake of making deductions your supplier will also make.
- Choose the fitting style first: recess fitting places the blind inside the window opening, while exact/face fitting covers the opening from the wall or front of the recess.
- For a recess fit, measure the width at the top, middle and bottom and the drop at the left, centre and right. Use the smallest relevant measurements unless your chosen supplier instructs otherwise.
- Check recess depth and obstructions such as handles, vents, tiles or inward-opening windows before assuming a blind can sit fully inside the recess.
- Do not automatically subtract a universal amount from recess measurements. Many made-to-measure suppliers ask for the actual recess size and make their own manufacturing deduction.