Length Unit Converter

Supports conversion between metric and imperial length units, including 9 units such as millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles.

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Speed and Stability: Processing speed depends on your device and browser. For large batch work, the desktop version may be more stable.

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Tool Usage

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1Settings

2Convert

3Copy Export

Input ValueSupports decimals, negatives, and scientific notation

Source Unit

Main Result Unit

Quick Input

Batch DataOne value per line, unit optional

Use “value unit symbol”; if no unit is given, the source unit below is used.

Default Source Unit

Target Unit

Display Precision

Number Format

Copy Format

Main result

1 centimeter = 10 millimeters

Select parameters to start converting.

Metric base0.01 m

Unit categoryMetric units

Result count9 units

Common references

Copy and batch results

Instructions

Software Usage Instructions

Select a conversion mode: Use “Single Conversion” to process one length value, or “Batch Conversion” to process multiple lines of data at once.
Set the input: Enter the length in the value field, then select the source unit and the main result unit; batch mode supports formats such as “12.5 cm”, “3 m”, and “48 in” on each line.
Configure the display format: Choose smart precision, fixed decimal places, standard numbers, thousands separators, or scientific notation as needed.
Start conversion: Click “Start Conversion, Go to Next Step”, and the system will generate results for each unit using meters as the unified base.
View and filter results: View results for nanometers, micrometers, millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, nautical miles, Chinese units, and more, and filter by unit name or symbol.
Copy and export: Copy the main result, copy all results, or download a CSV table; for batch data, only the first 20 rows are previewed on the page, while copying and exporting include all processed results.
Save settings: Click “Save Settings” to keep commonly used units, precision, and copy formats for future use.

FAQ

A: It supports conversion between nanometers, micrometers, millimeters, centimeters, decimeters, meters, kilometers, inches, feet, U.S. survey feet, yards, miles, nautical miles, li, zhang, chi, cun, and other units.

A: A foot is calculated as 1 ft = 0.3048 m; a U.S. survey foot is calculated as 1 ft-us = 1200/3937 m. The difference is very small, but it needs to be distinguished in surveying, historical coordinates, and large-distance conversions.

A: Enter one value per line, optionally with a unit symbol, such as 12.5 cm, 3 m, 48 in, or 1.2 km. If no unit is entered, the default source unit selected in batch mode will be used.

A: When result values are very large or very small, scientific notation keeps them compact and easy to read. You can also switch the number format to regular numbers or thousands separators.

A: Copying results is suitable for pasting into documents, chats, or notes; CSV export is suitable for further organizing and archiving batch conversion results in software such as Excel or WPS Spreadsheets.