Curtain Size Calculator — Panel Width and Length
Size finished curtain panels from the hardware they must cover rather than from glass width alone. The result separates coverage width, fullness, panel count, and floor clearance so stock-panel comparisons and custom orders remain easy to audit.
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View all saved project estimatesWhat does the curtain size calculator calculate?
Measure the usable curtain rod or track width, choose a fullness multiplier and finished panel count, then measure from the hanging point to the floor. The calculator returns combined flat curtain width, width per panel, and finished panel length after subtracting your preferred floor clearance.
Curtain panel width and finished length formulas
Fullness adds material beyond the closed coverage span so fabric can form folds. Dividing that combined flat width by the whole panel count gives an equal finished width for each panel. Length is kept separate because heading hardware determines the correct starting point and floor treatment determines the endpoint.
How to measure for an accurate estimate
- Install or firmly mark the rod or track location, then measure the usable coverage span between working endpoints rather than including decorative finials.
- Measure from the exact point where the selected hook, ring, grommet, tab, or carrier supports the curtain down to the finished floor.
- Take vertical measurements at the left, center, and right because rods and floors may not be perfectly level; resolve differences before ordering.
- Choose fullness and panel count from the curtain maker’s instructions, especially for pinch pleats, wave headings, sheers, lined drapery, or tracks with overlaps and returns.
Two full panels across a six-foot track
A 72-inch usable track will use two finished panels at 2× fullness. The measured hanging point is 96 inches above the floor, and the desired floor clearance is one-half inch.
The curtains need 144 inches of combined flat finished width, or 72 inches per panel. The finished target length is 95.5 inches. Sewing cut dimensions and stock-panel quantity still depend on the selected product or fabrication method.Before you purchase material
- Compare the calculated finished width with the manufacturer’s listed width per panel, and round the purchase quantity up when stock panels cannot be split.
- Confirm whether a product listing contains one panel or a pair, and whether its width is a flat finished dimension, pleated coverage width, or fabric width before gathering.
- Check rod or track capacity, bracket quantity, wall substrate, stack-back space, finial clearance, radiator location, registers, furniture, and door or window operation.
- For custom sewing, calculate cut width and yardage separately with the actual fabric width, repeats, seams, side hems, bottom hems, header allowance, lining, and shrinkage.
Common questions
How wide should curtains be for a 72-inch rod?
At the calculator’s 2× fullness default, a 72-inch usable rod needs 144 inches of combined flat finished curtain width. Two equal panels would be 72 inches wide each. Use the curtain manufacturer’s fullness guidance because heading construction, fabric weight, and desired appearance can change the multiplier.
Should I measure the window or the curtain rod?
Size finished curtains from the usable rod or track span they must cover. Window width helps position new hardware, but it does not include every extension, return, or overlap. If hardware is not installed, mark its final endpoints first and verify surrounding wall space before ordering.
Does the result include hems and heading allowance?
No. The calculator reports finished panel width and length. A sewing plan must separately add side hems, bottom hems, heading depth, seams, lining, shrinkage, pattern repeats, returns, and overlaps. Ready-made products should be compared by their stated finished dimensions and package quantity.
How do I choose curtain floor clearance?
Measure from the actual hanging point and select the endpoint you want, such as slightly above the floor or just touching it. Consider uneven floors, cleaning, pets, doors, radiators, and fabric movement. Puddled curtains require added length and are outside this subtractive-clearance calculation.
Sources and reference standards
- IKEA USA — BENGTA Curtain Measuring GuidanceCurrent product guidance using rod or track width, a selected fullness multiplier, and panel width to estimate curtain quantity.
- IKEA USA — VIDGA Curtain Track Buying GuideManufacturer measuring guidance for window width, track coverage, mounting position, curtain length, and bracket planning.
- National Institute of Standards and Technology — SI Units: LengthPrimary federal reference for customary and metric length definitions and unit relationships.
Use this result in a complete project plan
Living room layout planner
A living room can have enough total square footage and still fail at the places people actually use: the viewing seat may be too close to the screen, a rug may miss furniture legs, curtain panels may not cover the rod with the intended fullness, or an artwork group may collide with a switch. This guide turns the room into linked viewing, seating, window and wall-display zones before products are ordered.
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