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ToolWrenConvert any length or distance between metric and imperial units. Type a value, pick the units, and every other unit updates instantly.
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Length is a free, private online tool that lets you convert length and distance between meters, kilometers, miles, feet, inches, yards and nautical miles. It runs entirely in your browser, so nothing you enter is uploaded to a server.
Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.
Metric (meters, centimeters, kilometers) and imperial/US units (inches, feet, yards, miles) describe the same distances with different bases. This converter holds the exact ratios so results are precise.
Every unit is defined relative to the meter — 1 inch is exactly 0.0254 m and 1 mile is 1609.344 m. Your value is converted to meters internally, then to the target unit.
1 meter is about 3.28 feet, 1 mile is about 1.609 km, 1 inch is 2.54 cm. The All units table shows your value in every unit at once.
Every length unit can be defined as a fixed multiple of one base unit, the metre. Once you know each unit's ratio to the metre, any conversion is two steps: convert the input to metres, then divide by the target unit's ratio. This tool stores the internationally agreed exact ratios — for example 1 inch is defined as exactly 0.0254 m and 1 mile as 1609.344 m — so results are precise rather than approximate.
The metric system (millimetre, centimetre, metre, kilometre) scales in clean powers of ten, which is why most of the world and all of science use it. The imperial/US system (inch, foot, yard, mile) grew from historical units with awkward ratios — 12 inches to a foot, 3 feet to a yard, 1760 yards to a mile. Converting between the two systems is exactly where a tool like this saves time and prevents mistakes.
A handful come up again and again: 1 metre is about 3.281 feet; 1 foot is 0.3048 m; 1 inch is 2.54 cm; 1 mile is about 1.609 km; 1 km is about 0.621 miles; and 1 yard is 0.9144 m. The 'all units' table shows your value in every supported unit at once, so you never have to chain conversions in your head.
A nautical mile (1852 m) is longer than a land mile and is used in aviation and at sea because it corresponds to one minute of latitude on the Earth's surface, which makes navigation maths natural. Speed in knots is simply nautical miles per hour. This converter includes nautical miles alongside the everyday land units.
Length conversion turns up constantly: reading a height in both feet and centimetres, following a recipe or DIY plan written in another country's units, interpreting product dimensions, planning travel distances, and checking engineering or construction measurements. Because everything runs in your browser, conversions are instant and work offline.