Feet Conversion

Tape measures can be used to measure units of length, and a calculator can be used to convert to another unit

The foot is a unit used to measure length. Use one of the conversion calculators below to convert to another unit of measure, or read on to learn more about feet.

Foot Conversion Calculators

Choose a unit of length to convert to.

US Customary & Imperial Units
SI Units

Foot Definition and Usage

The foot is a unit of linear length measure equal to 12 inches or 1/3 of a yard. Because the international yard is legally defined to be equal to exactly 0.9144 meters, one foot is equal to 0.3048 meters.[1]

The foot is a US customary and imperial unit of length. Feet can be abbreviated as ft, for example 1 foot can be written as 1 ft.

Feet can also be denoted using the symbol, otherwise know as a prime, though a single-quote (') is often used instead of the prime symbol for convenience. Using the prime, 1 ft can be written as 1′.

The foot is most commonly measured using either a standard 12" ruler or a tape measure, though there are many other measuring devices available.. Feet are sometimes referred to as linear feet, which is simply the value of a length in feet, learn more.

You might be interested in our feet and inches calculator, which can add feet with inches, centimeters, or meters.

Background and Origin

The foot has been used throughout history to measure length.[2] The actual length of the foot has varied and been defined differently in different countries.

The foot was initially defined as being equal to the length of the human foot, 4 palms, or 16 digits. Due to the inconsistencies of human anatomy, the definition eventually evolved to be equal to 12 inches.

Throughout time, different nations and regions had different definitions of the true length of the foot. In 1959 the world agreed that the yard would be equal to .9144 meters, which means that one foot is now equal to .3048 meters.

Feet Measurement Conversion Table

Common foot values and equivalent imperial and metric length measurements
feet miles yards inches kilometers meters centimeters millimeters micrometers nanometers
1' 0.000189 mi 0.333333 yd 12" 0.000305 km 0.3048 m 30.48 cm 304.8 mm 304,800 µm 304,800,000 nm
2' 0.000379 mi 0.666667 yd 24" 0.00061 km 0.6096 m 60.96 cm 609.6 mm 609,600 µm 609,600,000 nm
3' 0.000568 mi 1 yd 36" 0.000914 km 0.9144 m 91.44 cm 914.4 mm 914,400 µm 914,400,000 nm
4' 0.000758 mi 1.333333 yd 48" 0.001219 km 1.2192 m 121.92 cm 1,219 mm 1,219,200 µm 1,219,200,000 nm
5' 0.000947 mi 1.666667 yd 60" 0.001524 km 1.524 m 152.4 cm 1,524 mm 1,524,000 µm 1,524,000,000 nm
6' 0.001136 mi 2 yd 72" 0.001829 km 1.8288 m 182.88 cm 1,829 mm 1,828,800 µm 1,828,800,000 nm
7' 0.001326 mi 2.333333 yd 84" 0.002134 km 2.1336 m 213.36 cm 2,134 mm 2,133,600 µm 2,133,600,000 nm
8' 0.001515 mi 2.666667 yd 96" 0.002438 km 2.4384 m 243.84 cm 2,438 mm 2,438,400 µm 2,438,400,000 nm
9' 0.001705 mi 3 yd 108" 0.002743 km 2.7432 m 274.32 cm 2,743 mm 2,743,200 µm 2,743,200,000 nm
10' 0.001894 mi 3.333333 yd 120" 0.003048 km 3.048 m 304.8 cm 3,048 mm 3,048,000 µm 3,048,000,000 nm
11' 0.002083 mi 3.666667 yd 132" 0.003353 km 3.3528 m 335.28 cm 3,353 mm 3,352,800 µm 3,352,800,000 nm
12' 0.002273 mi 4 yd 144" 0.003658 km 3.6576 m 365.76 cm 3,658 mm 3,657,600 µm 3,657,600,000 nm
13' 0.002462 mi 4.333333 yd 156" 0.003962 km 3.9624 m 396.24 cm 3,962 mm 3,962,400 µm 3,962,400,000 nm
14' 0.002652 mi 4.666667 yd 168" 0.004267 km 4.2672 m 426.72 cm 4,267 mm 4,267,200 µm 4,267,200,000 nm
15' 0.002841 mi 5 yd 180" 0.004572 km 4.572 m 457.2 cm 4,572 mm 4,572,000 µm 4,572,000,000 nm
16' 0.00303 mi 5.333333 yd 192" 0.004877 km 4.8768 m 487.68 cm 4,877 mm 4,876,800 µm 4,876,800,000 nm
17' 0.00322 mi 5.666667 yd 204" 0.005182 km 5.1816 m 518.16 cm 5,182 mm 5,181,600 µm 5,181,600,000 nm
18' 0.003409 mi 6 yd 216" 0.005486 km 5.4864 m 548.64 cm 5,486 mm 5,486,400 µm 5,486,400,000 nm
19' 0.003598 mi 6.333333 yd 228" 0.005791 km 5.7912 m 579.12 cm 5,791 mm 5,791,200 µm 5,791,200,000 nm
20' 0.003788 mi 6.666667 yd 240" 0.006096 km 6.096 m 609.6 cm 6,096 mm 6,096,000 µm 6,096,000,000 nm

References

  1. National Institute of Standards and Technology, U.S. Survey Foot: Revised Unit Conversion Factors, https://www.nist.gov/pml/us-surveyfoot/revised-unit-conversion-factors
  2. Wikipedia, Foot (unit), https://en.wikipedia.org/wiki/Foot_(unit)

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