Curtain Size Lab Search

HARDWARE GUIDE · REVIEWED SEPTEMBER 11, 2026

How Long Should a Curtain Rod Be?

Calculate curtain rod working length and total span from the window, side space, and finials.

MEASURED WIDTHFINISHED DROP
Original proportional diagram. Use actual measurements; drawing is not to scale for a specific product.

SHORT ANSWER

Start here

For an uninstalled rod, start with window width plus the chosen extension on both sides. A 60-inch window with 6 inches per side gives a 72-inch working rod; add finials separately to understand the overall wall span.

Example window60 in
Side extension6 + 6 in
Working rod72 in
Overall+ finials

How to measure

  1. 01

    Measure the actual working rod or track width; if hardware is not installed, record the window-frame width and your planned side extensions separately.

  2. 02

    Measure the drop from the reference point stated for the selected heading—not from an unrelated edge of the window.

  3. 03

    Check whether a package contains one panel or a pair, then compare total flat fabric width rather than the label width alone.

  4. 04

    Recheck the selected product, tape, hooks, carriers, and fabric before ordering or cutting.

Use an adjustable rod range carefully

The window calculation should land inside the product’s adjustable working range, not merely match its maximum decorative span.

Check open-curtain space

Panel stack may consume some of the working rod. The fabric, heading, lining, and fullness decide the real amount.

Hardware strength is separate

Length alone does not establish bracket count or capacity. Follow the exact rod manufacturer instructions for support and fixing decisions.

Before you order or cut

Measure the actual window and selected product. Finished sizes, fullness, header take-up, hardware geometry, and manufacturer tolerances vary. Fabric can shrink, stretch, or behave differently by composition. Measurements do not guarantee fit, privacy, water containment, installation, load capacity, or structural safety. Use the selected product instructions, and have a professional workroom verify expensive custom-fabric orders.

SOURCE NOTES

What this page is based on

Measurements here combine mathematical results with labeled commercial conventions and design recommendations. Disagreements are kept as ranges rather than averaged into a false standard.

  1. BETYDLIG/RÄCKA/HUGAD buying guide — Measure your windowIKEA · reviewed 2026-09-11

    Primary manufacturer guide: add at least 6 in each side, add 6 in above, and use 2–2.5× rod width for panel planning.

  2. VIDGA — How to measure your windowsIKEA · reviewed 2026-09-11

    Current manufacturer track-system guide with measured-window diagrams, minimum side extension, stack-back planning, and hanging-point length references.