Curtain Size Calculator
A curtain size calculator is a practical tool used in interior design to measure the appropriate dimensions for curtains based on window and desired aesthetics.
A window that's 60 inches wide and 72 inches tall, and you want floor-length curtains with a 6-inch rod overhang on each side, the calculator would tell you that you need curtains with a width of at least 144 inches (to achieve a fullness of 2x) and a length of about 84 inches (assuming an 8-inch rod height above the window).Curtain Size Calculation Chart
| Measurement | Formula | Description |
|---|---|---|
| Curtain Width | (Window Width + 2 Rod Overhang) Fullness Factor | Fullness Factor: 1.5-3x for gathered, 1-1.5x for flat panels |
| Curtain Length (to sill) | Window Height – Rod Height + 0.5 inch | For curtains ending at the window sill |
| Curtain Length (to floor) | Floor to Rod – 0.5 inch | For floor-length curtains |
| Rod Length | Window Width + 2 * Rod Overhang | Ensures curtains can be fully opened |
Curtain Size Measuring Formula
The basic formula for curtain width is:
Curtain Width = (Window Width + 2 Rod Overhang) Fullness FactorA window that’s 80 inches wide, want a 6-inch rod overhang on each side, and desire a fullness factor of 2x, the calculation would be:
Curtain Width = (80 + 2 6) 2 = 184 inchesThis means you’d need curtains with a total width of 184 inches to achieve the desired fullness and coverage.
How to find curtain size?
To find the correct curtain size:
Measure your window width and height
Decide on rod placement (usually 4-6 inches above the window)
Determine desired rod overhang (typically 3-6 inches on each side)
Choose curtain fullness (1.5-3x for gathered look)
Decide on curtain length (sill, below sill, or floor-length)
Let’s walk through an example:
- Window: 70 inches wide, 60 inches tall
- Rod placement: 4 inches above window
- Rod overhang: 5 inches on each side
- Desired fullness: 2x
- Floor-length curtains (floor to rod height is 88 inches)
Calculations:
- Rod length = 70 + (2 5) = *80 inches
- Curtain width = 80 2 = *160 inches
- Curtain length = 88 – 0.5 = 87.5 inches
You’d need curtains with a width of 160 inches and a length of 87.5 inches.
More Everyday Life Tools