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Inches to centimetres, exact by definition since the inch was fixed at 25.4 mm in 1959. This is the direction you need when an American spec sheet meets a metric tape measure: US furniture dimensions against a room measured in centimetres, a monitor sold by diagonal inches, waist and inseam sizes on imported jeans.
Frequently asked questions
What's the formula for inches to cm?
Multiply by 2.54: 12 inches × 2.54 = 30.48 cm. There's no rounding involved — the inch is defined as exactly 2.54 cm, so the conversion is exact rather than approximate.
What is 5 foot 9 in centimetres?
175.26 cm. Convert the feet to inches first (5 × 12 = 60, plus 9 = 69 inches), then multiply by 2.54. The length converter has a feet option if you'd rather not do the first step by hand.