Speed Converter Convert Units Instantly
Convert speed measurements instantly between kilometers per hour, miles per hour, meters per second, knots, Mach and other common speed units with accurate results.
Speed Units
Instant Results
Online Tool
Speed Converter
Convert speed values instantly
Conversion Formula
Formula used to calculate the result
Calculation Steps
See exactly how the speed conversion was calculated.
Instant Results
Convert speed measurements instantly without refreshing the page.
Common Speed Units
Supports km/h, mph, m/s, knots, Mach and other useful speed units.
One-Click Swap
Reverse your source and target units instantly.
Mobile Friendly
Optimized for phones, tablets, laptops and desktop screens.
Understand Speed Units and Conversions
Speed measures how quickly an object travels over a given distance. Different countries, industries and scientific fields use different units to express speed.
Kilometers per hour (km/h) is commonly used for road speeds in many countries, while miles per hour (mph) is commonly used in the United States and several other regions.
Scientific calculations commonly use meters per second (m/s). Aviation and marine applications commonly use knots.
This speed converter makes it easy to move between these units without manually calculating conversion factors.
Built for Everyday Use
Use the calculator for everyday measurements, travel, education, technical work and quick unit comparisons.
Popular Speed Conversion Examples
Common reference values for frequently used speed units.
km/h → mph
100 km/h
≈ 62.1371 mph
mph → km/h
60 mph
≈ 96.5606 km/h
m/s → km/h
10 m/s
= 36 km/h
knots → km/h
1 knot
= 1.852 km/h
How to Use the Speed Converter
Enter a Speed
Enter the speed value you want to convert.
Select Units
Choose the original unit and the unit you want to convert to.
Get Your Result
Click Convert Speed to view the result and calculation details.
Speed Conversion Formula
General conversion method
Target Speed = Input Speed × Conversion Factor
Each speed unit has a defined relationship with a standard reference unit. The appropriate conversion factor is applied to calculate the target value.
Conversion Accuracy
Standard conversion factors
- ✓ Uses standard relationships between speed units.
- ✓ Supports decimal speed values.
- ✓ Provides instant conversion results.
- ✓ Reverse conversions are available with the swap button.
Speed Converter FAQ
Answers to common questions about speed units and conversions.
What is a speed converter? +
A speed converter changes a speed measurement from one unit into another, such as kilometers per hour to miles per hour or meters per second.
Which speed units are supported? +
The calculator supports meters per second, kilometers per hour, miles per hour, kilometers per second, miles per second, feet per second, feet per minute, knots and Mach.
How many kilometers per hour is 60 mph? +
60 mph is approximately 96.5606 km/h.
How many mph is 100 km/h? +
100 km/h is approximately 62.1371 mph.
Can I convert decimal speed values? +
Yes. Decimal values such as 72.5 km/h or 15.75 mph can be converted.
Can I reverse a speed conversion? +
Yes. Use the swap button between the source and target units to reverse the conversion direction.
Is this speed converter free? +
Yes. The Speed Converter is available online for free for standard speed conversions.
Conversion Information
Standard conversion factors are used for supported speed units. Mach is based on a reference speed of approximately 340.29 m/s and can vary depending on altitude, temperature and atmospheric conditions. For specialized engineering, aviation, scientific or commercial applications, verify the required standards and precision.
Convert Your Speed in Seconds
Enter your speed, select the units and get an accurate conversion with calculation details.