Curtain Panel Calculator
Estimate curtain panels from window width and fullness.
Curtain Panel measurements
Enter your values, then calculate.
Result
How to calculate curtain panel
This calculator finds how many curtain panels are needed based on window width, panel width, and desired fullness.
How the calculation works
Panels needed = ceil((Window width × Fullness multiplier) ÷ Panel width).
Example
A 60-inch window, 54-inch panels, 2x fullness: ceil((60×2)÷54) = ceil(2.22) = 3 panels.
Frequently asked questions
How is Result calculated?
Result = ceil([Total window width] × [Fullness multiplier] ÷ [Panel width]).
Is the Curtain Panel Calculator free to use?
Yes — every calculator on Simple Calculator Tools is free, runs in your browser, and does not require an account.
Curtain Panel Calculator
Panels needed = ceil((Window width × Fullness multiplier) ÷ Panel width).
Let's understand your curtain panel result.
Calculate a result above and this guide will help you interpret it using this calculator's own formula and explanation.
Pro Tips for Curtain Panel
- A fullness multiplier of 2-2.5x is common for a gathered, non-flat curtain look — use 1x only if you want panels to hang flat.
- Round up to a whole panel count, since partial panels aren't a purchasable unit.
Common Curtain Panel Mistakes to Avoid
- Using a fullness multiplier of 1 (no gathering) when the intended look is a fuller, pleated curtain, which would result in too few panels for the desired look.
When to Use This Calculator
This calculator finds how many curtain panels are needed based on window width, panel width, and desired fullness.