Feet and Inches Calculator — Combined Length Converter
Enter separate feet and inches — the calculator combines them and converts to centimetres, metres, millimetres, yards and total inches in one step.
ft
in
5 ft 9 in
- 1
Total inches
(5 × 12) + 9 = 69 - 2
Convert to centimetres
69 × 2.54 = 175.261 inch = 2.54 cm exactly (international definition, 1959).
How does this calculator work?
Multiply feet by 12 and add the inches to get total inches; multiply by 2.54 for centimetres. 5 ft 9 in → 69 × 2.54 = 175.26 cm. Divide by 100 for metres, multiply by 10 for millimetres, divide by 36 for yards. All factors are exact (1 in = 2.54 cm exactly).
Formula
How this is calculated
When a length is given as feet and inches together (for example 5 ft 9 in), the first step is to express everything in a single unit. Multiplying the feet by 12 gives the equivalent inches; adding the explicit inches gives total inches. From there, multiplying by 2.54 converts to centimetres — one inch is exactly 2.54 cm by the international definition adopted in 1959. Dividing centimetres by 100 gives metres; multiplying by 10 gives millimetres.
The calculator also normalises any entry where the inches field is 12 or more: the overflow is automatically carried into the feet column. For example, entering 5 ft 14 in is treated as 6 ft 2 in. Yards are derived by dividing total inches by 36 (1 yd = 3 ft = 36 in), and the reference line places the result on a 0–250 cm scale so you can see it in the context of typical human heights.
All conversion factors are exact, so no rounding error enters the calculation — only the final display is rounded to the chosen decimal places.
Frequently asked questions
5 × 12 + 11 = 71 total inches. Multiply by 2.54: 71 × 2.54 = 180.34 cm, which is 1.8034 m.
Yes. Leave the unused field blank or at zero — the calculator treats it as zero. Entering 0 ft 18 in gives 1 ft 6 in = 45.72 cm.
The calculator normalises automatically. For example 4 ft 15 in = 4 ft 15 in total, which carries over to 5 ft 3 in = 63 × 2.54 = 160.02 cm.
Also known as
TG we-Calculate Editorial Team. (2026). Feet and Inches Calculator — Combined Length Converter [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/feet-and-inches-calculator
TG we-Calculate Editorial Team. "Feet and Inches Calculator — Combined Length Converter." TG we-Calculate. 2026. https://we-calculate.com/calculator/feet-and-inches-calculator.
TG we-Calculate Editorial Team, "Feet and Inches Calculator — Combined Length Converter," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/feet-and-inches-calculator
@misc{wecalculate_feet_and_inches_calculator, title = {Feet and Inches Calculator — Combined Length Converter}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/feet-and-inches-calculator}}, year = {2026}, note = {TG we-Calculate} }
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