Enter a Length
Results update live in every unit — no button needed.
In All Units
| Unit | Value |
|---|
About this length converter
The United States is one of only three countries still measuring in inches, feet and miles, so converting between the U.S. customary system and the metric system is a daily task for students in science class, engineers reading international drawings, runners comparing race distances, and anyone shopping from abroad.
This converter handles the eight most common length units at once. Type a single value — say 12 inches — and you immediately see the same length in centimeters, meters, millimeters, feet, yards, kilometers and miles. There is no calculate button to press and no dropdown pair to fiddle with: every unit updates live as you type.
The conversions use exact international definitions: one inch is exactly 2.54 centimeters, one foot is 0.3048 meters, one yard is 0.9144 meters and one mile is 1609.344 meters.
Popular inch, foot and mile conversions
| US / imperial | Metric |
|---|---|
| 1 inch | 2.54 cm |
| 5 inches | 12.7 cm |
| 1 foot | 30.48 cm |
| 3 feet (1 yard) | 0.9144 m |
| 1 mile | 1.609 km |
| 10 km | 6.21 miles |
| 100 m | 328.08 ft |
How to convert length units
- Type your length: Enter any number — decimals and large values both work — into the length field.
- Pick the source unit: Choose inches, feet, yards, miles, millimeters, centimeters, meters or kilometers from the dropdown.
- Read all conversions at once: The table instantly shows your length in every other unit, with your chosen unit marked as the source.
Frequently asked questions
How many cm are in an inch?
One inch is exactly 2.54 centimeters by international agreement since 1959. So to convert inches to centimeters, multiply by 2.54 — 10 inches equals 25.4 cm. To go from cm to inches, divide by 2.54.
How do you convert feet to meters?
One foot equals exactly 0.3048 meters. Multiply feet by 0.3048 to get meters: a 6-foot person is about 1.83 m tall. For rough mental math, three feet are just under one meter.
How long is a mile in kilometers?
One mile is exactly 1.609344 kilometers. Runners use a handy rule: multiply miles by 1.6, so a 5K (5 kilometers) is about 3.1 miles, and a marathon's 26.2 miles equal roughly 42.2 kilometers.
Which is longer, a yard or a meter?
A meter is slightly longer: one yard is 0.9144 meters, so a meter is about 9.4 percent longer than a yard. On a football field this matters — 100 yards is only 91.44 meters.