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Curtain Size Calculator
Calculate the finished curtain width and drop for your window or pole.
home Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Finished curtain length
Compare Your Options And Get Clear Answers
Calculate the finished curtain width and drop for your window or pole.
Curtain Size Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Drop = rail-to-floor – gap; width = rail x fullness.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Curtain Quick Guide
Typical values for reference.
| Rail cm | Drop cm | Fullness | Finished drop |
|---|---|---|---|
| 180 | 220 | 2 | 218.5 cm drop |
| 120 | 160 | 2 | 158.5 cm drop |
| 240 | 250 | 2.5 | 248.0 cm drop |
| 150 | 180 | 1.8 | 179.0 cm drop |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Curtain Size Calculator FAQ
Answers to common questions about this calculator.
Measure rail width and drop, then multiply width by fullness.
About 2 times for a gathered look.
Around 20 to 30 cm in total.
Fit it first.