Curtain fabric planner
Plan full fabric widths, cut lengths and purchase metres for equal curtain panels. Drag the graph handles to change inputs and explore the result.
Your inputs
Values shown are editable examples; verify your own measurements and product specifications. Results update as you edit.
Calculations run in your browser. Inputs are not saved or sent to analytics.
How it works
- h₀ = + + ; Cut length per width = h₀ ( = 0); Cut length per width = ceil(h₀ / ) × ( > 0)
- Widths per panel = ceil( × / / ( − 2 × ))
- Fabric to purchase = (Total fabric widths × Cut length per width + ) / 100
- Worked example: 200 cm × 2 / 2 / 130 cm → 2; 4 × (220 + 10 + 20) cm = 10 m
Input and formula key
Your result
Complete the inputs to see your result.
Assumptions and limitations
All measurements are cm. Each equal panel uses whole vertical fabric widths. Usable width subtracts two entered edge allowances per strip, conservatively covering sides/seams; round widths upward separately for each panel. Cut drop adds top and bottom allowances, then rounds upward to a whole straight pattern repeat. Add extra purchase allowance once. No half-drop match, nap reversal, railroaded fabric, shrinkage or supplier increment is modeled. Enter extra fabric as needed.
Sources
- British Institute of Interior Design — measuring windows and fabric Sources reviewed: 2026-10-09
