Curtain Size Calculator: Easy and Accurate

How to Measure Your Window for Different Curtain Styles

Measuring your window correctly is the foundation of finding the perfect curtain size. Different curtain styles require specific measurement techniques to achieve the desired look and functionality.

Start by measuring your window frame width from outside edge to outside edge. This gives you the actual window width. For curtain calculations, you’ll typically want your curtain rod to extend 4-6 inches beyond each side of the window frame.

For height measurements, determine where you want to hang your curtain rod. Most designers recommend mounting the rod 4-6 inches above the window frame and extending it 4-6 inches beyond each side. This creates the illusion of larger windows and allows maximum light when curtains are open.

How to Choose from Standard Window Curtain Lengths

Standard curtain lengths make shopping easier and more affordable. Understanding these common sizes helps you choose the right option for your space without custom alterations.

The most popular standard curtain lengths include:

• 63 inches – Perfect for standard windows and café style
• 84 inches – Ideal for most residential windows
• 96 inches – Great for tall windows and 9-foot ceilings
• 108 inches – Suitable for 10-foot ceilings
• 120 inches – Designed for high ceilings and dramatic looks

How to Calculate the Length of Your Curtain Using Our Curtain Size Calculator

Our curtain size calculator simplifies the measurement process by considering multiple factors that affect your final curtain dimensions. The tool accounts for your preferred curtain style, desired fullness, and mounting preferences.

To use the calculator effectively, first measure your window width and height accurately. Enter these measurements along with your desired curtain style. The calculator automatically adjusts for different styles like café curtains, floor-length panels, or dramatic puddle effects.

The fullness setting determines how gathered or flat your curtains will appear. A 2x fullness means your curtain width should be twice your window width for a standard, pleasing appearance. Higher fullness ratios create more luxurious, gathered looks.

How to Find the Correct Width of Your Curtain from Standard Curtain Widths

Curtain width calculation involves more than just measuring your window. You need to consider the curtain rod length, desired fullness, and whether you’re using single or multiple panels.

Standard curtain panel widths typically range from 42 to 54 inches per panel. For wider windows, you’ll need multiple panels to achieve proper coverage and fullness. The general rule is that your total curtain width should be 1.5 to 3 times your window or rod width.

Here’s how to determine the number of panels needed:

• Measure your curtain rod length (window width plus extensions)
• Multiply by your desired fullness factor (typically 2x)
• Divide by the width of individual curtain panels
• Round up to the nearest whole number for panel quantity

What to Do if Your Curtain is Too Long

When your curtains are too long, you have several adjustment options depending on the amount of excess length and your sewing skills. Professional hemming provides the most polished result, but simple DIY solutions can work for minor adjustments.

For curtains that are only slightly too long, try adjusting the curtain rod height. Moving the rod up a few inches can eliminate the excess length while creating the illusion of taller windows. This works particularly well if you haven’t yet installed the rod permanently.

If significant shortening is needed, consider these options:

• Professional hemming for permanent, clean results
• Iron-on hem tape for quick, no-sew adjustments
• Fold and pin temporarily to test the new length
• Create a decorative fold or cuff at the bottom

Are You Looking for a Curtain Length or Curtain Width Calculator?

Our comprehensive curtain size calculator handles both length and width calculations simultaneously. This dual-function approach ensures your curtains will have proper proportions and coverage for your specific windows and style preferences.

Length calculations depend on your chosen curtain style and ceiling height. The calculator considers whether you want sill-length, apron-length, floor-length, or puddle-style curtains. Each style has specific measurement requirements for optimal appearance.

Width calculations factor in your window size, rod extension, and desired fullness. The tool helps you determine how many curtain panels you need and their individual widths for complete window coverage with your preferred gathered appearance.

Whether you’re decorating a small apartment or a large home, accurate curtain measurements ensure your window treatments enhance your space’s aesthetics while providing the privacy and light control you need. Use our calculator as your starting point, then consult with fabric professionals for specialized installations or custom requirements.