Read the selected result
Confirm that the source and target names match the units in your note, drawing, route, or specification before copying the displayed value.
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Free Length Converter Online
Convert meters, feet, inches, centimeters, kilometers, miles, and more. See the formula and equivalent values for dimensions, heights, and distances with no login.
- • Metric and customary units
- • Meters, feet, inches, miles
- • Formula and equivalents
- • Runs in this browser
Convert a length
Enter a distance or dimension, then choose its source and target length units. The result and reference values update in this browser.
Quick conversions
Free online, no registration or login. Values stay in this browser while the conversion runs.
Your converted value will appear here
Enter a number, then choose compatible source and target units.
How to convert length units
Keep the source measurement and target unit clear before you reuse the number.
- Step 1
Enter one measured value
Type the number exactly as you have it, including a decimal when the source measurement uses one.
- Step 2
Choose two length units
Select the source and target units from millimeters through nautical miles. Both selectors stay within linear length units.
- Step 3
Check the result and reverse it
Review the target value, formula, and same-value equivalents. Use Swap units when you need the reverse direction.
How to check a length conversion
A direct answer is useful when you know the target unit. The formula and all-equivalents view make the unit choice easier to check before you reuse a number.
Use the formula shown
The calculator converts supported lengths through meters, then expresses the same distance in the selected target unit.
Round for the measurement you have
A long decimal is a readable conversion result, not a claim about your ruler, plan, instrument, or required tolerance.
Metric, customary, and nautical-mile notes
The selected units describe the same linear distance, but a few naming and input differences can change the number you should enter.
Metric units scale from meters
Millimeters, centimeters, meters, and kilometers are related by powers of ten. The meter is the SI unit of length.
Feet and inches are two parts of one length
For a height such as 5 ft 9 in, first use 69 inches or 5.75 feet, then convert that one value. Do not enter 5.9 feet for 5 ft 9 in.
A nautical mile is not a statute mile
This tool lists nautical miles separately. A nautical mile equals 1,852 meters, so it will not give the same result as a statute mile.
Everyday length conversions
Use the calculator to translate a stated length. It does not decide which unit, tolerance, or measurement standard a particular project requires.
Dimensions and materials
Compare millimeters, centimeters, inches, and feet when a drawing, product specification, pattern, or material dimension uses another system.
Heights in feet and meters
Convert a height after combining its feet-and-inches parts into one length. The all-equivalents view can also show centimeters and inches together.
Route and travel distances
Compare kilometers, statute miles, and nautical miles only as the named distance units in your source. This tool does not calculate travel time or routes.
Privacy and limits
Your value and selected length units stay in this browser while the calculation runs. This free online tool requires no registration or login.
- The calculator supports common linear length units only. It does not convert area, volume, speed, currency, or every scientific and regional measurement convention.
- For a feet-and-inches value, combine the two parts into one number of inches or decimal feet before using the normal unit controls.
- Displayed values are rounded for readability; the original measurement's precision, tolerance, and any required legal, engineering, laboratory, construction, or manufacturer rule remain your responsibility.
Length Converter FAQ
Answers about metric and customary units, feet and inches, rounding, and this tool's scope.
How do I convert one length unit to another?
Enter the measured value, choose its source length unit, then choose the target unit. The result panel shows the selected answer, the conversion relationship, and the same value in every supported length unit.
How many feet are in a meter?
One meter is about 3.28084 feet. To convert meters to feet, multiply by that relationship; to convert feet to meters, multiply by 0.3048.
Is 1 inch exactly 2.54 centimeters?
Yes. The standard inch is exactly 25.4 millimeters, which is 2.54 centimeters. This converter uses that relationship for inch, foot, yard, and mile conversions.
How do I convert feet and inches to meters or centimeters?
First turn the inches into part of a foot or convert the whole height to inches. For example, 5 ft 9 in is 69 in, or 5.75 ft, before converting that one length to meters or centimeters.
How do I convert centimeters to inches?
Divide centimeters by 2.54 to get inches. You can also select centimeters as the source unit and inches as the target in the calculator.
How do I convert kilometers to miles?
Multiply kilometers by about 0.621371 to get statute miles. For the reverse direction, multiply miles by 1.609344 to get kilometers.
Is a nautical mile the same as a mile?
No. This converter labels nautical miles separately from statute miles. A nautical mile is exactly 1,852 meters, so select the unit named in your source material.
Why are some results rounded?
The tool displays a readable decimal result. Your original measurement, instrument tolerance, required significant figures, and any industry-specific rounding rule still determine how much precision you should use.
Is this length converter free online without registration or login?
Yes. You can use this length converter free online without registering or logging in.
Does this converter upload my measurement?
No. The value and selected units are used by the calculator in this browser while you work.
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