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Curtain Fabric Calculator

See how much plain face fabric to buy, how many vertical drops to cut, and how they join into your curtains. For one window or several identical windows.

Build your fabric plan

Decimals and fractions such as 2 1/2 are welcome.

Try a complete example

Loading an example replaces your current inputs.

01 Finished curtains

Enter the measurements for one window. Every window in this plan uses the same size, fabric and allowances.

Measure the working span, excluding decorative finials.
From your chosen hanging point to the finished hem.
Each curtain is made from one or more joined fabric widths.
2 means flat curtain width is at least twice the coverage width.
For different sizes, calculate separately; copy or back up each plan before starting another.
02 Face fabric
The full width as sold, before trimming the selvages.
Only plain, non-directional fabric is supported.

Full-width vertical drops of face fabric only. Pattern matching, sideways cutting, lining and interlining need a different plan.

03 Allowances & shop cutting

These example allowances are editable. Check the totals required by your heading and hemming method before cutting.

Deducted from both edges of every fabric width.
Total consumed by all folds at one outer curtain edge.
Each join consumes two seam allowances.
All fabric consumed above the finished hanging point.
Include every fold used to make the bottom hem.
Added once to each cut length.
Added to the raw project total before shop rounding.
Use the smallest length your shop sells, such as ⅛ yd or 0.5 m.
Common increments
Optional coverage from each end of the rod back to the wall.
Add only if it is not already in your rod measurement.
04 Optional fabric budget

Enter the listed price to estimate the face-fabric cost. Leave it blank to skip the budget.

Optional. Excludes tax, delivery and other supplies.
Use the shop’s price unit, independently of your measurement unit.
A label for your estimate. No currency conversion is applied.
Edits save on this device
THE NUMBERS, EXPLAINED

Your finished size is only the starting point.

Side hems, joined edges and trimmed selvages reduce the width available for folds. The plan accounts for them before counting full fabric widths, then adds heading and hem allowances to each cut length.

See the full calculation method Follow a worked fabric example

The diagrams explain drops and allowances, not an optimized cutting layout. Printed patterns, directional fabric, lining and interlining are not included.

Your rod widthMeasure the rod, not the glassNot sure where to measure?

Everything here is free. No account or email is needed to calculate, save on this device, or print your plan. How local saving works.