Curtain Size Calculator
Calculate exact fabric requirements, panel dimensions, and rod length for perfect window treatments. Our calculator considers curtain style, mount type, and desired length to provide professional measurements for your project.
Last updated: December 15, 2024
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Traditional gathered curtains
Mount on wall above window
Ends at window sill
Curtain Measurements
Width: 54.0 inches
Length: 68.0 inches
Fullness: 2.5x
Panels: 3
Fabric & Hardware
Fabric Width: 135.0 inches
Rod Length: 60.0 inches
Header: 4.0 inches
Hem: 4.0 inches
Quick Example Result
For a typical 48" × 60" window with gathered curtains:
54"
Curtain Width
68"
Curtain Length
3
Fabric Panels
60"
Rod Length
How This Calculator Works
Our curtain size calculator uses professional interior design principles to determine exact fabric requirements and measurements. The calculation considers window dimensions, curtain style, mounting method, and desired length to provide accurate results for any window treatment project.
The Calculation Method
Fabric Width = Window Width × Fullness RatioTotal Length = Window Height + Header + Hem + Style AdjustmentsPanels Needed = Fabric Width ÷ Standard Fabric Width (54")This formula ensures proper fullness for your chosen style while accounting for standard fabric widths and professional finishing allowances.
Shows window measurements, fullness, and mounting options
Curtain Style Fullness Guide
Different curtain styles require different amounts of fabric to achieve the proper look:
- Gathered/Pleated: 2.5x fullness (most luxurious)
- Pinch Pleat: 2.5x fullness (formal, traditional)
- Grommet: 2x fullness (modern, casual)
- Rod Pocket: 2x fullness (classic style)
- Tab Top: 1.5x fullness (casual, relaxed)
- Flat Panel: 1x fullness (contemporary, minimal)
- Eyelet: 2x fullness (similar to grommet)
- Pencil Pleat: 2.5x fullness (versatile)
Professional Measuring Tips
- Width: Measure the window frame or the area you want to cover
- Height: Measure from where the rod will hang to your desired length
- Outside Mount: Add 6" to width (3" each side) and 4" to height
- Inside Mount: Measure exact interior frame dimensions
- Rod Placement: Mount 4-6" above window for outside mounting
- Length Options: Sill length, apron length (sill + 4"), or floor length
Sources & References
- American Society of Interior Designers (ASID) - Window Treatment GuidelinesProfessional standards for window treatment design and installation
- Window Covering Manufacturers Association (WCMA) - Industry Standards and Best PracticesTechnical guidelines for fabric calculations and measurements
- Interior Design Institute - Window Treatment Design PrinciplesEducational resources for proper curtain sizing and styling
Planning other room improvements? Check out our TV wall mount calculator and recessed lighting calculator.
Get Custom Calculator for Your BusinessExample Calculation
Window Specifications:
- Window Size: 48" × 60"
- Mount Type: Outside mount
- Style: Gathered curtains (2.5x fullness)
- Length: Sill length
Calculation Steps:
- Curtain width: 48" + 6" (outside mount) = 54"
- Fabric width: 54" × 2.5 (fullness) = 135"
- Panels needed: 135" ÷ 54" = 3 panels
- Length: 60" + 8" (header + hem) = 68"
54"
Curtain Width
68"
Total Length
3
Fabric Panels
60"
Rod Length
Result: Need 3 panels of fabric, each 68" long, with a 60" curtain rod
Total fabric: 135" wide × 68" long for beautiful gathered curtains.
Frequently Asked Questions
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