Speed Converter

Enter the speed value in the input field.

Select the unit you are converting from.

Select the unit you want to convert to.

Read the live result displayed by the converter.

Use the swap control to reverse the selected units.

Adjust the decimal precision to display more or fewer decimal places.

Copy an equivalent value from the conversion cards when you need another unit.

You can use the equivalent cards to compare the same speed across all supported units without repeatedly changing the target unit.

Convert speed between meters per second, kilometers per hour, miles per hour, knots, and other common units with this free online Speed Converter. Enter a value, select the starting and target units, and see the result update instantly. Swap units, adjust decimal precision, and copy equivalent values for quick reference.

Whether you are checking a vehicle's speed, comparing running pace, or working with marine and aviation measurements, this tool makes it easier to compare different speed units.

Speed describes how much distance an object travels in a given amount of time. It is commonly expressed in units such as kilometers per hour (km/h), miles per hour (mph), and meters per second (m/s).

For example, a car traveling at 60 km/h covers 60 kilometers in one hour if it maintains that speed.

The basic relationship is:

Speed = Distance ÷ Time

Different industries and activities use different units. A road speedometer commonly displays km/h or mph, scientific calculations often use m/s, and marine and aviation measurements commonly use knots.

This converter supports seven units:

What is a knot?

A knot is one nautical mile per hour. It is commonly used to express the speed of ships, boats, and aircraft.

One knot equals exactly 1.852 kilometers per hour, or approximately 1.15078 miles per hour.

Knots are useful in marine navigation because nautical miles are related to the Earth's coordinates and are widely used in navigation charts. Aviation also uses knots for aircraft speed measurements.

Here are some common conversions to help you understand the differences between speed units.

These values are rounded for readability. The converter can display more decimal places when greater precision is needed.

The converter includes reference values for walking, city driving, and highway driving. These examples provide a familiar context for comparing speeds.

These are illustrative comparison values, not legal speed limits, recommended speeds, or safety guidance. Actual speeds vary by person, vehicle, road, location, and conditions. Always follow local traffic laws and posted limits.

Speed units are converted by expressing the same distance-per-time value in a different unit.

For example:

1 m/s = 3.6 km/h

1 km/h = 0.277777... m/s

1 mph = 1.609344 km/h

1 knot = 1.852 km/h

1 ft/s = 0.3048 m/s

1 ft/min = 0.00508 m/s

1 km/s = 1,000 m/s

The underlying speed remains the same; only the unit used to express it changes.