ToolsPointOnline
Speed Converter icon

Free Speed Converter Online

Convert kilometers per hour, miles per hour, meters per second, knots, feet per second, Mach, and other speed units quickly with accurate results.

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Privacy note: supported browser-first tools process ordinary inputs locally. Do not enter passwords, private keys, payment data or other confidential information into any online tool.

Quick Reference Conversions

Speed unit note: km/h and m/s are metric units, while mph, ft/s and knots are commonly used in US, UK, aviation, marine and technical contexts. Mach is based on the speed of sound and can vary with conditions, so it is shown as a reference conversion.

Speed Converter Online for km/h, mph, m/s, Knots and More

Use this free speed converter to convert kilometers per hour, miles per hour, meters per second, knots, feet per second, Mach and other common speed units. It is useful for travel, driving, running, cycling, aviation, marine measurements, school work, engineering and everyday calculations.

If you need a km/h to mph converter, mph to km/h converter, m/s to km/h converter or knots to mph converter, enter a value, choose the source and target units, and view the result instantly.

US, UK and Metric Speed Units

The converter keeps metric and commonly used customary units separate so results are easier to understand. Kilometers per hour and meters per second are common metric measurements. Miles per hour are widely used for road speed in the United States and the United Kingdom, while knots are common in aviation and marine navigation.

Common Speed Conversion Examples

  • 1 km/h = 0.621371 mph
  • 1 mph = 1.609344 km/h
  • 1 m/s = 3.6 km/h
  • 1 knot = 1.852 km/h
  • 1 ft/s = 0.3048 m/s

How to Use the Speed Converter

  1. Enter your speed in the From field.
  2. Select the source unit, such as km/h, mph, m/s or knots.
  3. Select the target unit in the To field.
  4. Use Convert or edit a value to update the result.
  5. Use the swap button to reverse the conversion direction.

Speed Conversion Accuracy

The calculator uses defined conversion factors and rounds displayed results to a practical number of decimal places. For regulated, scientific or engineering work, use the precision required by the applicable standard or specification.

Frequently Asked Questions

How do I convert km/h to mph?
Enter the value in kilometers per hour and select miles per hour as the target unit. The converter calculates the equivalent speed automatically.
How do I convert mph to km/h?
Enter the value in miles per hour and select kilometers per hour as the target unit. The converter calculates the equivalent speed automatically.
How do I convert m/s to km/h?
Enter the value in meters per second and select kilometers per hour. One meter per second equals 3.6 kilometers per hour.
Can I convert knots to mph?
Yes. Select knots as the source unit and miles per hour as the target unit to calculate the equivalent value.
Is this speed converter free?
Yes. ToolsPoint Online provides this speed conversion utility free to use without mandatory registration.
Does the speed converter work on mobile?
Yes. The responsive interface is designed for modern phones, tablets and desktop browsers.