Curtain Size Calculator - Calculate Perfect Curtain Dimensions
Calculate ideal curtain width, length, and fabric requirements for perfect window treatments with accurate fullness ratios
Curtain Size Calculator
Curtain Dimensions
What is a Curtain Size Calculator?
A Curtain Size Calculator is a free tool that helps you determine the perfect curtain dimensions for your windows. It calculates the ideal curtain width, length, and fabric requirements based on your window measurements, desired fullness, and style preferences.
This calculator works for:
- New window treatments - Calculate curtain sizes for new homes or room renovations
- Custom curtains - Determine fabric requirements for DIY or custom-made curtains
- Ready-made curtains - Find the right size when shopping for pre-made curtains
- Interior design projects - Plan window treatments for professional or personal design projects
For calculating room dimensions and space planning, check out our TV Viewing Distance Calculator to optimize furniture placement and viewing comfort in your living spaces.
Planning a home renovation budget? Use our Monthly Budget Calculator to allocate funds for curtains, furniture, and other home improvement expenses.
Shopping for curtains during sales? Our Percent Off Calculator helps you calculate discounts and final prices for home decor purchases.
How Curtain Size Calculator Works
The calculation uses these formulas:
Where:
- Window Width = Actual width of the window frame
- Fullness Ratio = 1.5x to 3x for desired curtain fullness
- Rod Height = Distance above window frame to mount rod (typically 4-6 inches)
- Style Adjustment = Kiss floor (0"), puddle (1-2"), or hover (-0.5")
- Hem Allowance = Additional fabric for top and bottom hems (typically 10 inches total)
Key Concepts Explained
Fullness Ratio
The multiplier applied to window width for proper draping. 2x is standard, 2.5-3x is luxurious.
Rod Placement
Mounting rods 4-6 inches above the window makes ceilings appear taller and windows larger.
Curtain Length
Kiss floor (just touching), puddle (1-2" on floor), or hover (0.5" above) for different styles.
Hem Allowance
Extra fabric needed for top and bottom hems, typically 4-6 inches each (10 inches total).
How to Use This Calculator
Measure Window
Measure actual window width and height in inches (e.g., 60" × 72")
Set Rod Height
Enter how high above window to mount rod (typically 4-6")
Choose Fullness
Select desired fullness ratio (2x standard, 2.5-3x luxurious)
Select Style
Choose curtain length style (kiss, puddle, or hover)
Set Panel Count
Choose number of curtain panels (typically 2 panels)
Get Results
View curtain dimensions and fabric requirements instantly
Benefits of Using This Calculator
- • Accurate Measurements: Get precise curtain dimensions for perfect window coverage and professional appearance.
- • Fabric Estimation: Calculate exact fabric requirements to avoid buying too much or too little material.
- • Cost Savings: Prevent costly mistakes by ordering the right size curtains the first time.
- • Professional Results: Achieve designer-quality window treatments with proper fullness and length ratios.
- • Multiple Styles: Compare different curtain styles and fullness options to find your perfect look.
Factors That Affect Your Results
1. Window Type
Bay windows, corner windows, and sliding doors require different measurements and panel configurations.
2. Fabric Type
Heavier fabrics like velvet need less fullness (1.5-2x), while sheer fabrics look best with more fullness (2.5-3x).
3. Ceiling Height
Higher ceilings allow for more dramatic rod placement and longer curtain lengths for visual impact.
4. Room Style
Modern rooms often use minimal fullness and clean lines, while traditional rooms favor fuller, more gathered curtains.
Frequently Asked Questions (FAQ)
Q: How much wider should curtains be than the window?
A: Curtains should be 1.5 to 3 times wider than the window for proper fullness. For a standard gathered look, use 2 times the window width. For a fuller, more luxurious appearance, use 2.5 to 3 times the width.
Q: How long should curtains be?
A: Curtains should either just touch the floor (kiss length), puddle slightly on the floor (1-2 inches), or hover 0.5 inches above the floor. For a modern look, curtains that just kiss the floor are most popular. Avoid curtains that hang several inches above the floor as they can make the room look shorter.
Q: How high should I hang curtain rods?
A: Hang curtain rods 4-6 inches above the window frame, or even higher near the ceiling for a dramatic effect. Mounting rods higher makes ceilings appear taller and windows larger. The rod should extend 3-6 inches beyond each side of the window frame.
Q: How do I calculate curtain fabric needed?
A: Calculate curtain fabric by multiplying your window width by your desired fullness ratio (typically 2x), then add the finished length plus hem allowances (usually 8-12 inches total for top and bottom hems). Don't forget to account for pattern repeats if using patterned fabric.