Measurement Guide

Complete guide to measuring for curtains, blinds, and home furnishings

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Curtains Blinds General Tips Common Mistakes

How to Measure for Curtains

Width Measurement

  1. Measure the inside width of your window frame
  2. Take measurements at top, middle, and bottom
  3. Use the smallest measurement for accuracy
  4. Add 2-4 inches to width for proper coverage
  5. For floor-length drapes, add 8-12 inches for fullness
WIDTH Inside Frame

Height Measurement

  1. Measure from top of window frame to desired length
  2. Floor-length: Measure to floor or slightly above
  3. Sill-length: Measure to window sill
  4. Apron-length: Measure 4-6 inches below sill
  5. Add 1-2 inches for hem allowance
Floor Length Sill Length Apron Length HEIGHT Sill

Curtain Size Calculation

Window Width
48 inches
Curtain Width Needed
96 inches (2x)
Final Size
96" × 84"

How to Measure for Blinds

Inside Mount (Inside Window Frame)

  1. Measure width at top, middle, and bottom of frame
  2. Use the smallest width measurement
  3. Measure height at left, center, and right
  4. Use the smallest height measurement
  5. Subtract 1/4 inch from width for clearance
Width Height -1/4" clearance

Outside Mount (Outside Window Frame)

  1. Measure width of window frame plus 2-3 inches on each side
  2. Measure height from top of frame to desired bottom
  3. Add 2-3 inches to top for mounting brackets
  4. For floor-length blinds, measure to floor plus 1/2 inch
Width + 2-3" each side Height + 2-3" top +2-3" +2-3"

Blind Type Specific Tips

Roman Blinds

Measure inside frame for inside mount, outside for outside mount. Add 1-2 inches for fullness.

Roller Blinds

Inside mount: subtract 1/4 inch. Outside mount: add 2 inches each side.

Zebra Blinds

Same as roller blinds. Ensure enough depth for dual layers.

General Measurement Tips

Tools You Need

  • Measuring tape (25 feet or longer)
  • Pencil and paper
  • Step ladder (if needed)
  • Helper (for large windows)
  • Level (for accuracy)

Measurement Best Practices

  • Measure each window individually
  • Take multiple measurements and use smallest
  • Measure in inches for accuracy
  • Double-check all measurements
  • Consider window type and mounting style

Quick Reference Chart

Product Width Allowance Height Allowance
Curtains (Inside Mount) 2-4 inches 1-2 inches
Curtains (Outside Mount) 4-8 inches 1-2 inches
Roman Blinds 2-3 inches 1-2 inches
Roller Blinds 2-3 inches 1-2 inches
Zebra Blinds 2-3 inches 1-2 inches

Common Measurement Mistakes to Avoid

❌ Don't Do This

  • Measuring only once
  • Using old or worn measuring tape
  • Estimating instead of measuring
  • Ignoring window type and mounting style
  • Forgetting to account for fullness

✅ Do This Instead

  • Measure at multiple points
  • Use a reliable measuring tape
  • Take precise measurements
  • Consider all installation factors
  • Add proper fullness allowances

Need Help with Measurements?

Our expert team is here to help you get the perfect fit.

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"Measure twice, order once. Ninety percent of fit problems we see come from measuring width at a single point — always check the narrowest and widest points of the window before you confirm."
— Cusella Measurement Specialists

Quick Facts

  • Measure each window in millimetres — accuracy matters for made-to-measure orders.
  • Decide drapery length first: floor-length (rod + 6–10 inches drop) or sill-length.
  • Blackout and dimout fabrics differ by lining, not by colour — check the lining before choosing.
  • Cusella offers free measurement and made-to-measure production across India.
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