Quick guide
How to use this calculator
- Enter values from one real situation and keep currencies, quantities, and periods consistent.
- Use the optional fields only when they apply; the calculator will keep every entered adjustment visible in the result.
- Compare the component outputs and read the calculator-specific boundary before making a purchase or plan.
Calculation method
Calculation method
Curtains use side overlap, fullness, heading, and hem; outside blinds use separate side, top, and bottom overlaps; inside blinds preserve the measured opening for manufacturer deductions.
Entered fixed decimals use exact rational arithmetic wherever the task involves money, ratios, or allocations. Whole packages, tables, seats, and items round only where the real task requires indivisible units.
Worked example
Worked example
A 200-wide opening with 15 curtain overlap per side and 2× fullness needs 460 total fabric width.
Curtains use side overlap, fullness, heading, and hem; outside blinds use separate side, top, and bottom overlaps; inside blinds preserve the measured opening for manufacturer deductions.
Supported inputs
Precision and limits
Your scenario
No live price, promotion, retailer policy, tax, cultural norm, household consumption rate, attendance rate, or media speed is supplied automatically.
Plan, not a guarantee
Results organize visitor-entered assumptions. They do not guarantee availability, attendance, product life, savings, suitability, or contractual rights.
Precision and privacy
Inputs stay in this browser. Invalid denominators, contradictory counts, impossible percentages, and unsupported ranges return explicit messages rather than misleading results.
Calculator-specific boundary
Only fields relevant to the selected treatment mode are used. Apply the actual manufacturer's deduction, overlap, hardware, fabric-repeat, shrinkage, seam, heading, and hem instructions. The calculator does not prescribe mounting or verify substrate and child-safety requirements.
Continue calculating