How to Measure for Curtains
Getting the right curtain measurements is the difference between a polished, intentional look and curtains that hang awkwardly. This guide walks you through measuring the width, choosing the length, and accounting for mounting height and header style so your curtains fit perfectly the first time.
Measure the window width
Measure the width of the window opening from one side of the frame to the other. For a full, gathered look, your curtain rod should extend 3 to 6 inches beyond each side of the window frame.
Calculate the curtain width
Multiply the rod width by 1.5 to 3 times for proper fullness. A multiplier of 2 is standard for most fabrics. Sheer curtains need 2.5 to 3 times the rod width, while heavier fabrics work with 1.5 times.
Decide on curtain length
Measure from the rod position to your desired endpoint. Common lengths are: sill length (to the window sill), apron length (4 inches below the sill), floor length (half an inch above the floor), or puddle length (1 to 3 inches pooling on the floor).
Account for the mounting height
Hanging curtains higher than the window frame makes the room feel taller. A good rule is to mount the rod 4 to 6 inches above the window frame, or halfway between the frame and the ceiling for a dramatic effect.
Choose the header style
The header type affects the measurement. Rod pocket curtains hang about an inch higher than the rod top. Grommet and tab-top curtains hang from the top of the grommet or tab. Ring-clip curtains hang below the rings, so add the ring length to your measurement.
Double-check with the rod in place
If possible, install the curtain rod first and then measure from the rod to the floor or desired endpoint. This eliminates guesswork about mounting height and gives the most accurate length measurement.
Curtain Length Cheat Sheet
Sill Length
Curtains end at or just below the window sill. Best for kitchens, bathrooms, and windows above radiators or furniture. Measure from the rod to the sill and subtract half an inch.
Apron Length
Curtains extend 4 inches below the window sill. A casual, relaxed look that works in bedrooms and living rooms. Measure from the rod to the sill, then add 4 inches.
Floor Length
Curtains hang half an inch above the floor for a clean, tailored look. This is the most popular and versatile length. Measure from the rod to the floor, then subtract half an inch.
Puddle Length
Curtains pool 1 to 3 inches on the floor for a dramatic, luxurious effect. Best for formal rooms and heavy fabrics like velvet or silk. Measure from the rod to the floor, then add 1 to 3 inches.
Frequently Asked Questions
How wide should curtains be?
Curtains should be 1.5 to 3 times the width of the window or curtain rod for proper fullness. A multiplier of 2 is standard. For example, a 40-inch wide window needs curtain panels totaling 80 inches in width.
Should curtains touch the floor?
Floor-length curtains should hang about half an inch above the floor for a clean, tailored look. If you prefer a more casual or dramatic style, let them puddle 1 to 3 inches on the floor. Avoid lengths that are too short and hover several inches above the floor.
How high should I hang curtain rods?
Mount curtain rods 4 to 6 inches above the window frame for a standard look. For a taller, more dramatic effect, hang them halfway between the window frame and the ceiling, or just below the ceiling line in rooms with standard 8-foot ceilings.