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Curtain Length Calculator
Enter your window size and hanging style to get the perfect curtain length and width. The calculator shows your exact panel size and the closest standard store size.
Find Your Perfect Curtain Size
Enter your window size and hanging style to get your curtain length and width.
WINDOW
Budget pick (1.5x fullness)Flatter look, less fabric
Luxury pick (2.5x fullness)Rich, deep folds like a hotel
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How It Works
Step 1: Measure your windowMeasure the window width, then the distance from your curtain rod down to the sill and down to the floor.
Step 2: Pick your styleChoose sill, apron, floor or puddle length, and how full you want the folds to look.
Step 3: Get your curtain sizeThe calculator shows the exact panel size to buy, plus the closest standard store size.
Formula Used in This Calculator
This calculator uses the standard curtain rules designers follow:
Floor length = Rod to floor distance - 1 inch Sill length = Rod to sill distance + 1 inch Total curtain width = Window width x Fullness (1.5 to 2.5) Panel width = Total curtain width / 2 panels Standard store lengths used: 54, 63, 72, 84, 96, 108 and 120 inches. The calculator always rounds you to the closest standard length at or above your exact size, so your curtains never fall short.Related Tools
Curtain Size Chart (Quick Guide)
| Window width | Total curtain width (2x full) | Buy 2 panels of |
|---|---|---|
| 36 in | 72 in | 36 to 40 in wide |
| 48 in | 96 in | 48 to 52 in wide |
| 60 in | 120 in | 60 in wide |
| 72 in | 144 in | 72 in wide |
3 Curtain Rules Designers Always Follow
- Hang high: mount the rod 4 to 6 inches above the frame to make the room feel taller.
- Hang wide: let the rod extend 4 to 6 inches past each side so open curtains clear the glass.
- Kiss the floor: floor length curtains look best ending half an inch above the floor.
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Curtain Length Calculator FAQs
1. What is the standard curtain length?
84 inches is the most common store length. It suits a rod mounted about 84 inches from the floor, the standard in most apartments.
2. How wide should curtains be for a 48 inch window?
About 96 inches in total for a full look, so two panels of roughly 48 inches each.
3. Should curtains touch the floor?
Floor length curtains should just kiss the floor or sit half an inch above it. Puddle length is a style choice for formal rooms.
4. What does fullness mean?
Fullness is how much fabric gathers across your window. 2x fullness means curtain width is twice the window width, giving rich, even folds.
What Our Readers Say
★★★★★
I always bought curtains too short. This tool gave me 84 inches for my living room and they kiss the floor perfectly.
Rachel N., Denver
★★★★★
The fullness guide is gold. 2x on my bedroom window looks like a boutique hotel now.
Tom H., Seattle
★★★★★
Measured once, bought once. The panel width it showed matched the store sizes exactly.
Grace M., Austin
★★★★★
Used the puddle option for my dining room. Soft, elegant, and the length was spot on.
Victor R., Miami
★★★★★
Finally a simple answer to rod to floor measuring. My studio windows look twice as tall.
Nina F., Brooklyn
★★★★★
The visual diagram helped me picture the sill length before ordering. No returns needed.
Omar S., Houston
Still Not Sure? Ask Us
Send us your room size and a photo of your space, and we will help you pick the right option for free.
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