Foot to Centimeter Converter — ft to cm
Convert a measurement in feet (and optional inches) to centimetres, metres and millimetres in one step — using the exact SI-defined ratio 1 ft = 30.48 cm.
ft
in
1 ft = 30.48 cm and 1 in = 2.54 cm (exact SI definitions)
- 1
Feet to centimetres
5 × 30.48 = 152.4 - 2
Inches to centimetres
10 × 2.54 = 25.4 - 3
Total centimetres
152.4 + 25.4 = 177.80
How does this calculator work?
Multiply feet by 30.48 and add inches × 2.54 to get centimetres (e.g. 5 ft 10 in = 177.8 cm exactly). These are exact SI definitions from 1959 — no rounding involved. The calculator also gives metres, millimetres, total inches and decimal feet.
Formula
How this is calculated
The international foot is defined as exactly 0.3048 metres (30.48 cm), and the international inch as exactly 2.54 cm. These exact definitions were adopted in 1959 by the international yard and pound agreement, so no rounding error is involved — the conversion from feet to centimetres is purely arithmetic.
To convert a mixed feet-and-inches measurement, multiply the feet by 30.48, multiply any additional inches by 2.54, and sum them. The calculator then derives metres (÷ 100), millimetres (× 10) and total inches (÷ 2.54). It also back-converts to show decimal feet and reconstructs the feet+inches format so you can cross-check the input.
Useful reference values: 6 ft = 182.88 cm; 5 ft = 152.4 cm; 5 ft 10 in = 177.8 cm; 1 ft = 30.48 cm; 1 in = 2.54 cm. These are all exact, not approximations.
Frequently asked questions
Exactly 30.48 cm. This is a defined value (not measured): 1 foot = 0.3048 m exactly by the 1959 international standard, making 1 ft = 30.48 cm with zero rounding error.
5 × 30.48 + 11 × 2.54 = 152.4 + 27.94 = 180.34 cm. Enter 5 feet and 11 inches in the calculator to verify — the result is exact.
Divide centimetres by 30.48 to get decimal feet, or divide by 2.54 to get total inches then divide by 12 for feet. For example 180 cm ÷ 30.48 = 5.9055… ft = 5 ft 10.87 in.
Also known as
TG we-Calculate Editorial Team. (2026). Foot to Centimeter Converter — ft to cm [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/foot-to-centimeter-converter
TG we-Calculate Editorial Team. "Foot to Centimeter Converter — ft to cm." TG we-Calculate. 2026. https://we-calculate.com/calculator/foot-to-centimeter-converter.
TG we-Calculate Editorial Team, "Foot to Centimeter Converter — ft to cm," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/foot-to-centimeter-converter
@misc{wecalculate_foot_to_centimeter_converter, title = {Foot to Centimeter Converter — ft to cm}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/foot-to-centimeter-converter}}, year = {2026}, note = {TG we-Calculate} }
Did this calculator help you?