Millimetres, Centimetres, Inches: Measuring Blinds Without Unit Chaos

No other purchase in the home mixes measurement systems the way blinds do: the tape on your shelf is likely in inches, the tailor (rightly) thinks in millimetres, the invoice bills by the square foot, and the AR tool on your phone outputs whatever you set. All systems are correct; mixing them mid-order is not.

The unit Rosetta stone

• 1 inch = 25.4 mm — the conversion a wrong-unit remake forgets
• 1 foot = 304.8 mm = 30.48 cm — houses were measured in feet for a reason; keep using them
• Billable area = width (ft) × drop (ft) — the number the price multiplies; a 4×5 ft window is 20 sq ft, and the 10 sq ft per-blind minimum is understood in the same unit

The one rule that prevents disasters

Write every measurement with its unit attached — "48 in" or "1220 mm", never a bare "48". The cause of most unit catastrophes is not conversion arithmetic; it is a clean-looking number with no passport. On a window list, a sketch, a WhatsApp to the vendor — always with the unit.

The working method we use

1. Measure in millimetres with a steel tape where the tape is fine, or inches where that is the habit — precision beats preference
2. Write width × height per window, each with its unit and a sketch label ("Bed 2", "Kitchen")
3. Hand it to the configurator or the AR tool — both accept inches and feet and do the conversion silently and correctly
4. If ordering where someone will type the numbers again, say the words aloud on a call: "forty-eight inches wide" hears better than "48"

What conversion laziness costs

A blind is fabricated to one specific millimetre; 48 inches of home tape arriving as 48 centimetres of order is a 2.54× error in a system that forgives nothing. Human order-checkers catch anomalies — our every order is reviewed before cutting — but the check that never fails is a number with a unit on it. Keep unit discipline and the maths stops mattering: the guide finishes most homes in fifteen minutes, and prices — GST included, from ₹100/sq ft roller and ₹120–₹190 zebra — are in the 2026 price guide.