How this calculator works
One foot is 12 inches by definition, so converting feet to inches is an exact multiplication by 12. Results retain the calculation precision until the final readout is formatted.
Formula
inches = feet × 12.
Worked example
6.25 ft to inches: 6.25 × 12 = 75 in.
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Frequently asked questions
How do I convert a measurement like 5 ft 9 in to inches only?
Multiply the feet by 12 and add the inches: 5 × 12 + 9 = 69 in.
Does this work for decimal feet from a tape measure or plan?
Yes. Decimal feet multiply by 12 the same way, so 6.25 ft is exactly 75 in.
Why does 6.1 ft give 73.2 in rather than 6 ft 1 in?
Decimal feet are fractions of a foot. The 0.1 means one tenth of a foot, which is 1.2 in, so 6.1 ft is 6 ft plus 1.2 in.