Feet to Inches
Convert feet to inches instantly. Free, fast, no signup.
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How to use this tool
- Enter feet in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your inches and the full breakdown beneath it.
Convert feet to inches instantly. Free, fast, no signup.
Formula
Inches = Feet × 12
By definition, one foot contains exactly 12 inches.
How it works
Multiply the number of feet by 12 to get inches. This is an exact, whole-number relationship within the imperial system — there is no rounding or approximation involved. The foot has been divided into 12 inches since at least medieval times, and this ratio is codified in both US customary and imperial measurement law.
Common mistake: People occasionally divide by 12 instead of multiplying, which gives the answer in feet rather than inches — the opposite of what is needed. Always multiply feet by 12 to convert to the smaller unit (inches).
Worked example
Convert 1 foot to inches
- Start with 1 foot.
- Multiply by 12 (the exact number of inches in one foot): 1 × 12 = 12.
- Result: 12 inches.
1 foot = 12 inches
Common mistakes to avoid
- Adding instead of multiplying -- writing 5 ft as '5 + 12 = 17 inches' instead of 5 x 12 = 60 inches.
- Forgetting to add any extra inches after multiplying the feet -- 5 ft 7 in = (5 x 12) + 7 = 67 in, not just 60 in.
- Confusing the conversion with meters -- feet to inches is x12, not x30.48.
Key terms
- Foot (ft)
- An imperial and US customary unit of length equal to exactly 12 inches or 0.3048 meters.
- Inch (in)
- The smallest commonly used imperial unit of length; one inch equals exactly 2.54 centimeters.
- Imperial system
- A system of measurement used in the US and historically in Britain, built on units such as inches, feet, yards, and miles.
- Exact conversion
- A conversion where the factor is a defined integer or simple fraction, producing no rounding error — feet to inches (×12) is one such exact conversion.
Frequently asked questions
- How do I convert feet to inches?
- Multiply the number of feet by 12 to get inches.