Convert between inches, feet, yards, miles, millimeters, centimeters, meters, and kilometers. Enter a value and see all conversions instantly.
12 in
= 0.3048 meters
Inches
12
in
Feet
1
ft
Yards
0.3333
yd
Miles
0.0001894
mi
Millimeters
304.8
mm
Centimeters
30.48
cm
Meters
0.3048
m
Kilometers
0.0003048
km
30.48 cm
Shown on a 0 to 37 cm ruler
1.3×
smaller than a bowling pin
1.3×
basketballs
1.4×
sheet of paper (width)s
2×
smartphones
2.8×
smaller than a baseball bat
3.6×
credit cards
Length conversion is one of the most common unit conversions needed in daily life, from international travel to home improvement projects. The metric system is used by most countries worldwide, while the imperial system is primarily used in the United States. This converter handles all major units in both systems so you can quickly switch between them.
One inch equals exactly 2.54 centimeters. This conversion factor is defined by international agreement and is used in engineering, manufacturing, and everyday measurements worldwide.
Multiply the number of miles by 1.60934. For example, 10 miles = 10 × 1.60934 = 16.0934 kilometers. A quick estimate is to multiply by 1.6.
The metric system (millimeters, centimeters, meters, kilometers) is based on powers of 10, making conversions straightforward. The imperial system (inches, feet, yards, miles) uses varying conversion factors (12 inches per foot, 3 feet per yard, 5,280 feet per mile).
Area Converter
Convert between square inches, square feet, square yards, acres, square miles, square centimeters, square meters, hectares, and square kilometers.
Unit Converter
Convert between common units of length, weight, temperature, and volume instantly. Select a category, enter your value, and see the result in real time.