📏 Length Converter
Instantly convert between all units of length and distance
⚡ Quick Conversions
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All Units at a Glance
📐 Common Length Reference
| Object / Distance | Length | Equivalent |
|---|---|---|
| Credit card width | 85.6 mm | 3.37 inches |
| A4 paper long side | 297 mm | 11.69 inches |
| Average human height | 1.7 m | 5 ft 7 in |
| Football field (American) | 91.44 m | 100 yards |
| Eiffel Tower | 330 m | 1,083 feet |
| Marathon distance | 42.195 km | 26.22 miles |
| Earth's diameter | 12,742 km | 7,918 miles |
| Moon distance | 384,400 km | 238,855 miles |
Length Unit Conversion Guide
Length is one of the most fundamental measurements. The metric system (meters, kilometers, centimeters) is used in most of the world, while the imperial system (feet, inches, miles) is primarily used in the United States and the United Kingdom for everyday measurements.
The base unit of length in the International System of Units (SI) is the meter (m). All other metric units are derived from it using powers of 10, making metric conversions straightforward.
Frequently Asked Questions
How many feet are in a meter?
1 meter = 3.28084 feet. Conversely, 1 foot = 0.3048 meters exactly (this is the defined relationship). So to convert meters to feet, multiply by 3.28084.
How many kilometers in a mile?
1 mile = 1.60934 kilometers. To convert miles to km, multiply by 1.60934. To convert km to miles, multiply by 0.62137 (or divide by 1.60934).
What is a nautical mile?
A nautical mile is 1,852 meters (1.852 km) and is used in maritime and air navigation. It is based on the circumference of the Earth — one nautical mile equals one minute of arc of latitude along a meridian.
How many centimeters in an inch?
1 inch = 2.54 centimeters exactly. This is a defined conversion. So 12 inches (1 foot) = 30.48 cm, and 1 meter = 39.3701 inches.
What is a light year?
A light year is the distance light travels in one year — approximately 9.461 × 10¹⁵ meters or about 5.879 trillion miles. It is used to express vast astronomical distances.
How do I convert feet and inches to cm?
To convert feet to cm: multiply feet by 30.48. To convert inches to cm: multiply inches by 2.54. For a mixed measurement (e.g. 5 ft 9 in): convert feet to inches first (5×12 = 60), add the extra inches (60+9 = 69 inches), then multiply by 2.54 = 175.26 cm.