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Unit Converters Converter
Fixed conversion factors, reviewed October 2026 — exact SI and customary ratios, not a calibrated instrument or legal-for-trade measure.
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Treat 1 foot as 12 inches and 1 inch as 25.4 mm. A 6 ft sofa is 182.88 cm; 2 ft 6 in is 76.2 cm. That uses the international inch, not a rounded "2.5 cm per inch" shortcut that drifts on a longer wall.
The international inch is exact here, which is enough for furniture, room plans, and DIY. It is not a calibrated survey chain or legal-for-trade length: cadastral work, fabric cut-lists sold by the metre, and CNC jobs need the instrument your trade actually certifies.
It does not certify survey or legal-for-trade lengths, correct a stretched tape, or convert area and volume — square and cubic units have their own converters on this hub.
Static conversion factors — not for precision metrology.
Exactly 2.54 cm (25.4 mm). The inch is defined that way, so 36 inches is 91.44 cm — not an approximation you round later.
Instruments apply temperature, calibration, and rounding rules this converter does not. For everyday conversions the factors here are exact; for certification, use calibrated equipment.
Where both exist — such as gallons — the unit list names each, so pick the one you mean.
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