Speed Unit Converter

Supports precise conversion between multiple speed units such as meters per second, kilometers per hour, miles per hour, and knots, covering metric, imperial, and nautical units.

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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

From Unit

Main Result Unit

Quick Input

Batch DataOne value per line, with optional unit

Use “value unit symbol”; pace can be 5:00 min/km. If omitted, the default from unit below is used.

Default From Unit

Target Unit

Display Precision

Number Format

Copy Format

Mach Reference TemperatureFor Mach conversion

Temperature Unit

Main result

120 km/h = 33.333333 m/s

Select parameters to start conversion.

m/s base33.333333 m/s

Unit categoryMetric units

Mach reference20 C，343.21 m/s

Batch results

Row	Input	Detected unit	Target result	Status

Copy & export

Common speed references

Instructions

Software Usage Instructions

Select conversion mode: Single conversion is suitable for quickly converting one speed value; batch conversion is suitable for processing multiple lines of speed data at once.
Enter the speed value: Enter the speed value in the input box. Decimals, negative numbers, and scientific notation are supported; in batch mode, enter one speed value per line.
Select the source unit and target unit: Supports units such as meters/second, kilometers/hour, miles/hour, feet/second, feet/minute, knots, Mach, fraction of the speed of light, minutes/kilometer, minutes/mile, and more.
Set display parameters: You can choose smart precision, fixed decimal places, thousand separators, scientific notation, and copy format.
Set the Mach reference temperature: When converting Mach, you can set the reference temperature in Celsius, Fahrenheit, or Kelvin, and the tool will calculate the result based on changes in the speed of sound.
Start conversion: Click the “Start conversion and proceed to the next step” button to view the main result, results for all units, and the batch table.
Copy and export: You can click an individual result to copy it, or copy all results or download a CSV file; for frequently used settings, click “Save settings” to keep them on the current device.

Frequently Asked Questions

A: To convert kilometers/hour to meters/second, divide by 3.6; to convert meters/second to kilometers/hour, multiply by 3.6. For example, 120km/h ÷ 3.6 = 33.333m/s.

A: A knot is a speed unit commonly used in navigation and aviation. 1 knot equals 1 nautical mile/hour, also equals 1.852 kilometers/hour, and is approximately equal to 0.514444 meters/second.

A: Miles/hour uses imperial length units, while kilometers/hour uses metric length units. 1mph equals 1.609344km/h, and 60mph is approximately equal to 96.56064km/h.

A: Mach number depends on the speed of sound, and the speed of sound in air changes with temperature. The tool calculates the meters per second corresponding to Mach 1 based on the reference temperature, then converts it to units such as kilometers per hour and miles per hour.

A: Pace indicates the time required to complete a fixed distance. For example, 5:00 min/km means 5 minutes per kilometer, which corresponds to a speed of 12km/h. The faster the speed, the lower the pace value.

A: Enter one speed value per line, such as “120 km/h”, “55 mph”, “25 knot”, “12 m/s”, “5:00 min/km”, or “Mach 0.82”. If no unit is specified, the default source unit in batch mode will be used.

A: When values are very large or very small, scientific notation makes the results easier to read. You can also switch to regular numbers or thousands separator format in “Number Format”.