Converters

Feet to Inches Converter

Convert feet to inches instantly. 1 foot = exactly 12 inches.

Enter a value above to see the conversion.

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Feet to Inches Formula

The conversion from feet to inches uses a fixed mathematical relationship.

in = ft × 12

Example: 5.5 ft × 12 = 66 in

About the Feet to Inches Conversion

Feet and inches are the two most commonly used length units in the US imperial system. While height is often expressed in feet and inches (e.g., 5 ft 10 in), many measurement contexts — building plans, fabric lengths, and athletic records — require total inches. Converting feet to total inches simplifies arithmetic and avoids ambiguity from mixed units.

The relationship is exact: 1 foot = 12 inches, inherited from the Roman uncia system and standardised by international agreement. For mixed inputs (e.g., 5 ft 9 in), first convert feet to inches (5 × 12 = 60) and then add the remaining inches (60 + 9 = 69 total).

Frequently asked questions

How many inches are in a foot?
There are exactly 12 inches in one foot — a fixed relationship in the imperial measurement system that has been unchanged since the international yard and pound agreement of 1959 standardised definitions across the US, UK, and other nations.
How many inches is 6 feet?
6 feet equals exactly 72 inches (6 × 12 = 72). This is a common height measurement conversion, since 6 feet is often expressed as 72 total inches in medical records, athletic profiles, and official identity documents.
How many inches is 5 feet 11 inches?
5 feet 11 inches equals 71 total inches. First convert the feet: 5 × 12 = 60 inches. Then add the remaining 11 inches: 60 + 11 = 71 inches total, which is equivalent to approximately 180.3 cm.
Why are there 12 inches in a foot?
12 is a highly composite number, divisible by 2, 3, 4, and 6, which made it practical for trade and measurement before decimal arithmetic was widespread. The foot was historically divided into 12 equal parts (inches) so that it could easily be split into halves, thirds, and quarters.
How do I convert a height in feet and inches to total inches?
Multiply the number of feet by 12 to get the foot component in inches, then add any remaining inches. Example: 5 feet 9 inches = (5 × 12) + 9 = 60 + 9 = 69 total inches, which equals approximately 175.26 centimeters.

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