Free Curtain Size & Length Calculator — Find Curtain Width, Length, Rod Size & Panels
Use this free curtain size calculator by AstheticDecor.com to find the perfect curtain width, curtain length, rod or pole length, panel count, fabric quantity, and ready-made curtain size. Enter your window measurements and get a designer-style curtain recommendation in seconds.
Curtain Size & Length CalculatorMeasure smarter. Style your windows like a designer.
Find the right curtain width, curtain length, rod or pole length, panel count, fullness, fabric quantity, and ready-made curtain size with a warmer, more polished home decor experience.
Your measurements
cm / inchesYour result
LiveHow this curtain calculator works
This tool calculates the ideal curtain size from your window width, rod extension, heading style, fullness, and desired length. It also estimates curtain rod length, ready-made panel count, fabric quantity, pattern-repeat allowance, and stack-back space so your curtains look full instead of flat.
What size curtains do I need?
For most windows, choose total curtain fabric width around 2× the rod or pole width. Sheer curtains may need closer to 3× fullness, while heavy blackout curtains can often look good around 1.5× to 2×.
How long should curtain rods be?
A designer-friendly starting point is to extend the rod several inches or centimeters beyond both sides of the window. Use more extension for blackout curtains or heavy fabrics so the curtain stack does not block the glass when open.
Should curtains touch the floor?
For a clean modern look, curtains can hover just above the floor or lightly kiss it. A slight break or soft puddle creates a more relaxed, romantic style but is less practical in busy homes.
How to Use the Curtain Size Calculator
To use the curtain size calculator, first measure your window opening width. Then measure from the top of the window frame to the floor, sill, or the point where you want your curtains to end. Select your curtain heading style, such as eyelet, pencil pleat, pinch pleat, sheer, or rod pocket. The calculator will then suggest the ideal curtain width, curtain length, rod size, number of panels, and fabric quantity.
How to Calculate Curtain Width
Curtain width is usually calculated by multiplying the curtain rod or pole width by the fullness level. For a simple look, use around 1.5× fullness. For a fuller designer look, use 2× fullness. For pencil pleat, pinch pleat, wave curtains, or sheer curtains, you may need 2.5× to 3× fullness.
Simple formula:
Curtain width = rod width × fullness
Example:
If your rod is 80 inches wide and you want 2× fullness:
80 × 2 = 160 inches total curtain width
How to Calculate Curtain Length
Curtain length depends on where your curtain rod is installed and where you want the curtain to finish. For a modern look, curtains can slightly hover above the floor or just touch the floor. For a softer luxury look, curtains can slightly break or puddle on the floor.
Common curtain length styles:
| Style | Best for |
|---|---|
| Sill length | Kitchens, bathrooms, small windows |
| Apron length | Casual rooms and short windows |
| Floor length | Living rooms, bedrooms, dining rooms |
| Puddle length | Luxury bedrooms and formal spaces |
Curtain Rod Length Calculator
A curtain rod should usually be wider than the window. This gives your curtains space to stack on the sides when open and makes the window look larger. A good starting point is to extend the rod several inches beyond each side of the window. For blackout curtains, wider rod extension is better because it helps reduce side light gaps.
Simple formula:
Rod length = window width + left extension + right extension
Example:
If your window is 60 inches wide and you add 8 inches on each side:
60 + 8 + 8 = 76 inches rod length
Curtain Fullness Guide
Curtain fullness means how much extra fabric is used compared to the rod width. More fullness creates deeper folds and a more premium look.
| Curtain type | Recommended fullness |
|---|---|
| Eyelet / grommet curtains | 2× |
| Pencil pleat curtains | 2× to 2.5× |
| Pinch pleat curtains | 2× to 2.5× |
| Wave / ripple fold curtains | 2× to 2.2× |
| Sheer curtains | 2.5× to 3× |
| Blackout curtains | 1.5× to 2× |
Blackout Curtain Size Calculator
Blackout curtains need a slightly different calculation because they should cover more than the window opening. For better light control, install the rod higher than the window and extend it wider on both sides. Choose curtains that are wide enough to overlap the window properly and long enough to reach close to the floor or sill.
Best blackout curtain tips:
Use a wider rod, choose enough fullness, avoid narrow panels, and make sure the curtains extend beyond the window edges.
Ready-Made Curtain Size Guide
Ready-made curtains usually come in standard widths and lengths. The calculator helps you choose the closest ready-made size based on your window and rod measurements. If your result falls between two sizes, choose the larger size and adjust the hem if needed.
| Common curtain length | Best use |
|---|---|
| 63 in / 160 cm | Short windows |
| 84 in / 213 cm | Standard rooms |
| 95–96 in / 241–244 cm | Taller rooms |
| 108 in / 274 cm | High ceilings |
| 120 in / 305 cm | Extra tall spaces |
Curtain Size Calculator in Inches and Centimeters
This calculator works in both inches and centimeters, so you can measure your window in the unit you prefer. If you are buying from a US store, inches are commonly used. If you are buying from a UK, European, or international store, centimeters and meters may be more useful.
Common Curtain Measuring Mistakes
Many people buy curtains that are too narrow, too short, or mounted too close to the window. This can make the room look smaller and the curtains look flat. For a designer look, measure the rod width, add enough side extension, choose proper fullness, and decide the curtain length before buying.
FAQs About Curtain Sizes
Add FAQs for user help, but do not depend on FAQ rich results. Google’s FAQ rich results are now limited mainly to well-known government or health sites, and Google’s FAQ documentation says FAQ rich results no longer appear in Search as of May 7, 2026.
What size curtains do I need?
For most windows, choose curtains with a total flat width around 2× the curtain rod width. Use more fullness for sheer curtains and slightly less fullness for heavy blackout curtains.
How wide should curtains be for a 60-inch window?
For a 60-inch window, a rod around 76 inches wide is often a good starting point if you add 8 inches on each side. With 2× fullness, you may need around 152 inches of total curtain width.
How long should curtains be?
For a clean designer look, curtains should usually hover just above the floor or lightly touch the floor. Sill-length curtains work better for kitchens, bathrooms, and small windows.
How much wider should a curtain rod be than the window?
A curtain rod should usually extend several inches beyond each side of the window. For blackout curtains or heavy curtains, use a wider extension to reduce light gaps and give the fabric space to stack.
Are eyelet curtains measured differently?
Yes. Eyelet curtains need enough width to create soft folds. Around 2× fullness is usually a good choice for eyelet or grommet curtains.