Free Curtain Size Calculator: Get Perfect Window Measurements
If you’ve ever bought curtains only to realize they look like flat sheets when closed, you’ve experienced “skimping.” Most people assume curtain width should match the window width—but in the world of interior design, fullness is everything.
I built this calculator because I saw too many readers struggling with complex math involving “fullness ratios” and “rod-to-floor” offsets. I wanted to create a simple, visual way for anyone to get professional results without needing a degree in design.
Curtain Size Calculator
Perfect drapes, every single time.
Why It’s Free
At Handy Crafts HUB, we believe that creating a beautiful, cozy home shouldn’t be gated behind a paywall or expensive consulting fees. This tool is free to use because our mission is to empower homeowners and DIYers with the right resources to succeed on their first try. No subscriptions, no "pro" versions, just helpful code for your home.
Key Features
- Custom Fullness Ratios: Choose from "Tailored" (minimalist) to "Maximum" (ultra-luxurious) to see how the fabric volume changes.
- Visual Live Preview: Our interactive window mock-up updates in real-time as you select different styles, showing you exactly how much "stack-back" your curtains will have.
- Smart Length Logic: The calculator automatically accounts for the "high and wide" hanging rule, adding the necessary inches to give you that floor-skimming look.
- Mobile-Friendly: Whether you’re at home with a measuring tape or standing in the aisle at a home goods store, the calculator works perfectly on your phone.
How to Use the Calculator
- Measure Your Window: Use a metal measuring tape to find the width and height of the actual window frame.
- Input Your Data: Enter those numbers (in inches) into the calculator.
- Pick Your Style: Select your fullness. (We recommend Standard 2x for most rooms and Deluxe 2.5x for bedrooms).
- Get Your Results: The tool will instantly provide the total fabric width, the width per panel (assuming you are using two panels), and the ideal length range.