# Measurement

# Inch

The inch (symbol: `in`

or `″`

) is a unit of length in the British imperial and the United States customary systems of measurement.
`1`

inch is `2.54`

centimeters.

# Foot

The foot (plural - feet, symbol: `ft`

or `'`

) is a unit of length in the British imperial and the United States customary systems of measurement.
`1`

foot is `30.48`

centimeters.

# Mile

The mile (symbol: `mi`

) is a unit of distance in the British imperial and the United States customary systems of measurement.
`1`

mile is `1.61`

kilometers.

# Pound

The pound or pound-mass (symbol: `lb`

) is a unit of mass in the British imperial and the United States customary systems of measurement.
`1`

pound is `0.45359237`

kilograms.

# Ounce

The ounce or ounce-mass (symbol: `oz`

) is a unit of mass in the British imperial and the United States customary systems of measurement.
`1`

ounce is `28.349523125`

grams (`1/16`

of pound).

# Gallon

The gallon (symbol: `US gal`

, `US dry gal`

, `imp gal`

) is a unit of volume in the British imperial and the United States customary systems of measurement.
`1`

US gallon is `3.785411784`

litres, `1`

US dry gallon is `4.40488377086`

litres, `1`

imperial gallon is `4.54609`

litres.