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Calculator Answers

How Many Inches in a Foot

Blake Boege
Written by Blake Boege · Founder, Calculator Answers

An inches-in-a-foot conversion page translates length measurements between feet and inches. A standard foot contains exactly 12 inches, which is also equivalent to 30.48 centimeters or 0.3048 meters.

Convert between feet and inches instantly. Learn about the ancient origins of the foot and the advantages of the base-12 measurement system.

Quick Answer

Find out exactly how many inches are in a foot (12 inches per standard foot).

Direct Answer

How Many Inches Are in a Foot?

There are exactly 12 inches in one foot.

For metric measurements, one foot is equal to exactly 30.48 centimeters or 0.3048 meters.

Equivalent Metric Length

30.48 cm
0.3048 m

Formula: 1 Foot = 12 Inches (exactly 30.48 cm)

Feet to Inches Reference Table

Feet (ft)Inches (in)
1/4 ft3 in
1/2 ft6 in
3/4 ft9 in
1 ft12 in
1.5 ft18 in
2 ft24 in
3 ft (1 yd)36 in
5 ft60 in
10 ft120 in
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Examples

1/2 Foot

6 inches

1 Foot

12 inches

3 Feet (1 Yard)

36 inches

How it works

In both the US Customary and British Imperial measurement systems, feet and inches are related by a standard constant ratio:

Standard Length Conversion

1 Foot = 12 Inches

Conversion Formula

Multiply feet by 12 to get inches. Divide inches by 12 to get feet.

The History and Origin of the Foot

The standard unit of a "foot" was historically based on the length of a human foot, used by ancient civilizations including the Greeks and Romans. However, because human feet vary in size, different cities and regions had their own standard foot lengths.

In 1959, the International Yard and Pound Agreement standardized the foot globally, defining it in terms of the metric system:

1 Foot = 0.3048 Meters (exactly 30.48 Centimeters)

Why Base 12 is Historically Preferred

The use of 12 inches to a foot is a relic of the duodecimal (base-12) system, which was widely favored in commerce and trade. The number 12 is highly versatile because it can be divided evenly into:

  • Halves (1/2 foot = 6 inches)
  • Thirds (1/3 foot = 4 inches)
  • Quarters (1/4 foot = 3 inches)
  • Sixths (1/6 foot = 2 inches)

By contrast, a base-10 system (like the metric system) can only be divided evenly by 2 and 5.

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How Many Inches in a YardThere are exactly 36 inches in a yard. Convert yards to inches instantly and check our length conversion charts and math.

Frequently asked questions

There are exactly 6 inches in a half-foot (12 ÷ 2).

The number 12 is a highly composite number, meaning it has many divisors (2, 3, 4, and 6). This made it far easier in ancient and medieval trade to divide a foot into halves, thirds, quarters, and sixths without resulting in fractional fractions, unlike the decimal base of 10.

There are exactly 30.48 centimeters in a foot, since 1 inch is defined internationally as exactly 2.54 centimeters (12 × 2.54 = 30.48).

2 feet is equal to 24 inches; 3 feet (which is equal to 1 yard) is 36 inches; and 4 feet is equal to 48 inches.