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Frequently Asked Questions
One inch is exactly 2.54 cm. It is not a rounded figure — the inch was defined as exactly 2.54 centimetres by the International Yard and Pound Agreement of 1959, so the conversion carries no error at all. Our guide on how many cm are in an inch explains why that agreement made it exact, and why the US kept a second, slightly different foot until 2023.
One foot is exactly 30.48 cm, because a foot is 12 inches and each inch is exactly 2.54 cm. Twelve times 2.54 gives 30.48 with nothing left over.
Turn the height into total inches first, then multiply by 2.54. For 5 feet 9 inches: 5 x 12 = 60, plus 9 = 69 total inches, times 2.54 = 175.26 cm. The common mistake is converting the feet and the inches separately and mixing up the units along the way.
170 cm is 5 feet 6.93 inches, which rounds to about 5 feet 7 inches. Divide 170 by 2.54 to get 66.93 total inches, then divide by 12 to get 5 feet with 6.93 inches left over. The chart on this page lists the other common heights.
Because a whole number of centimetres almost never lands on a whole number of inches. 176 cm is 5 feet 9.29 inches, so rounding gives 5 feet 9 inches, but converting 5 feet 9 inches back gives 175.26 cm rather than 176. That gap is rounding, not an error — this converter shows the exact value alongside the rounded one so you can see it.
No. The conversion is arithmetic that runs inside your browser. Nothing is uploaded, stored or logged, and the tool keeps working if you go offline after the page has loaded.