Feet to Inches Calculator — ft to in Converter
Enter any number of feet to get the exact equivalent in inches, centimetres and metres. One foot equals exactly 12 inches — no approximation needed.
ft
6 ft × 12 = 72 in
- 1
Conversion factor
121 foot = 12 inches exactly (international definition, 1959). - 2
Total inches
6 × 12 = 72
How does this calculator work?
Multiply feet by 12 to get inches — this is an exact definition, so 6 ft = 72 in = 182.88 cm. For combined feet-and-inches, convert feet first (×12) then add the inches: 5 ft 9 in = 60 + 9 = 69 in.
Formula
How this is calculated
The foot and inch are both US customary and imperial units sharing the same legal definition: one foot equals exactly 12 inches. One inch is defined as exactly 2.54 centimetres since the International Yard and Pound Agreement of 1959, making all conversions in this chain exact. Multiplying any number of feet by 12 gives the total inches, and multiplying the result by 2.54 gives centimetres — no measured constants are involved.
For fractional feet (for example 6.5 ft), the integer floor gives the whole feet (6) and the decimal remainder multiplied by 12 gives the remaining inches (0.5 × 12 = 6 in), so 6.5 ft = 6 ft 6 in = 78 in = 198.12 cm. The number line shows tick marks every 12 inches so you can see how many complete foot-lengths fit in the result.
This calculator is intentionally simple — for combined feet-and-inches entry (for example 5 ft 9 in) use the Feet and Inches Calculator instead.
Frequently asked questions
Exactly 12 inches. This is the legal definition in both the US customary and imperial systems and has not changed.
6 × 12 = 72 inches, which is also 182.88 cm (72 × 2.54) or 1.8288 m.
Multiply the feet by 12 and add the remaining inches. For 5 ft 9 in: (5 × 12) + 9 = 60 + 9 = 69 inches.
Also known as
TG we-Calculate Editorial Team. (2026). Feet to Inches Calculator — ft to in Converter [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/feet-to-inches-calculator
TG we-Calculate Editorial Team. "Feet to Inches Calculator — ft to in Converter." TG we-Calculate. 2026. https://we-calculate.com/calculator/feet-to-inches-calculator.
TG we-Calculate Editorial Team, "Feet to Inches Calculator — ft to in Converter," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/feet-to-inches-calculator
@misc{wecalculate_feet_to_inches_calculator, title = {Feet to Inches Calculator — ft to in Converter}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/feet-to-inches-calculator}}, year = {2026}, note = {TG we-Calculate} }
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