What this site does
The curtain size calculator is built for common buying decisions: whether to measure the window or the rod, how much stack-back to add, how fullness changes flat fabric width, and how to choose ready-made panel lengths without guessing.
The guide library supports the calculator with room-specific and problem-specific advice, including blackout curtains, sliding glass doors, tall ceilings, small windows, multiple windows on one rod, and ready-made panel labels.
How we write the guides
Each guide is written around a real measurement problem rather than a decoration slogan. We prioritize formulas, examples, tables, and buying checks so readers can compare numbers before ordering curtains.
The calculator is a planning tool. Final fit still depends on product labels, fabric behavior, hardware limits, floor level, brackets, and installation details.
Best starting points
- Use the curtain size calculator for rod length, curtain width, panel count, and finished drop.
- Read the methodology to understand the formulas behind the results.
- Browse the curtain measuring guides for special windows and room scenarios.