How to Measure Windows for Custom Curtains: Step-by-Step
Prep and Tools for Accurate Measurements
Before you pull out the tape measure, you need to make one major decision: Inside Mount vs. Outside Mount.
If you want the full Joydrape process in one place, our guide on how to measure for curtains is the best reference to keep open while you work.
- Inside Mount: The curtains hang within the window frame. This provides a sleek, modern look but is only possible if your window frame is deep enough (usually at least 2 inches).
- Outside Mount: The curtains hang on a rod mounted on the wall above the frame. This is the most common choice as it makes windows appear larger and provides better light blockage.
The Golden Rule: Always use a steel tape measure. Fabric tapes can stretch over time, leading to inaccuracies that can ruin a custom order. You’ll also want a sturdy ladder and a notepad to record every measurement immediately.
How to Measure for Curtain Width
Width is where many people make the mistake of measuring only the glass. For custom curtains to look luxurious, they need \"fullness\"—the folds of fabric when the curtains are closed.
For Outside Mount: Measure the width of your curtain rod from end to end (excluding the decorative finials). If you haven't installed the rod yet, measure the window width and add 6-10 inches on each side to allow the curtains to \"stack back\" without blocking the view. At Joydrape, we recommend a 2x to 2.5x fullness ratio. For a 50-inch rod, you generally want 100 inches of fabric width.
For Inside Mount: Measure the exact width of the inside of the window frame at the top, middle, and bottom. Use the smallest of the three measurements. We will typically deduct about 1/4 inch from each side to ensure the curtains can move freely without rubbing against the frame.
Before finalizing your order, also review your preferred curtain header styles and compare curtain lining options, because both choices affect finished look, fullness, and function.
Choosing the Right Curtain Length
The length (or drop) of your curtains determines the \"mood\" of the room. Here are the four standard options:
- Sill Length: Curtains end 1/2 inch above the windowsill. Ideal for kitchens or windows blocked by furniture.
- Apron Length: Curtains end about 4-6 inches below the windowsill, covering the window trim.
- Floor Length: The most popular choice. Curtains should end 1/2 inch above the floor. This prevents the fabric from gathering dust while maintaining a clean, tailored look.
- Puddle Length: Add 2-4 inches to the floor-length measurement. The fabric \"puddles\" on the floor for a romantic, high-end designer look—best for low-traffic areas like formal dining rooms.
Measure from the top of the rod (or the eyelet of the rings) down to your desired end point. Tip: Always measure both the left and right sides of the window; you'd be surprised how many floors and ceilings are slightly uneven!
Common Measuring Mistakes and Checklist
Avoid these frequent pitfalls to ensure your custom order is perfect:
- Mistake #1: Measuring the old curtains. Old fabric can stretch or shrink. Always measure the window and rod directly.
- Mistake #2: Forgetting the hardware. The position of your rod dictates where the curtains start. If you want \"floor-to-ceiling\" drapes, mount your rod 2-4 inches below the ceiling line.
- Mistake #3: Rounding too much. In custom manufacturing, 1/4 inch matters. Record exact numbers.
Your Final Checklist:
[ ] Did I use a steel tape?
[ ] Is my rod already installed (recommended)?
[ ] Did I measure the rod width, not just the window?
[ ] Have I decided on the \"drop\" (floor, sill, or puddle)?
[ ] Did I double-check my math?
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