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Sources and Accuracy
Length conversions use the metre as the reference unit. Common imperial relationships are exact where standardized, such as 1 inch = 0.0254 metre and 1 foot = 0.3048 metre.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-05-21.
About These Units
meter [m]
Definition
The meter is the SI base unit of length and is used as the reference unit for metric distance and size.
History
The meter was introduced during the development of the metric system and is now defined using the speed of light.
Current use
Meters are used worldwide in science, construction, engineering, mapping, product dimensions, and everyday measurement.
mile [mi]
Definition
The mile is an imperial and US customary length unit equal to exactly 1.609344 kilometers.
History
The statute mile developed from older land-measure systems and is now standardized as 5280 feet.
Current use
Miles are used for road distances, vehicle mileage, running, aviation references, and travel in the United States and UK.