What units are supported?

Kilometer per hour (km/h), Mile per hour (mph), Meter per second (m/s), Knot (kn), Foot per second (ft/s), and Mach number (Ma). These cover most common speed units used in travel, aviation, maritime, and physics.

A knot is a unit of speed equal to one nautical mile per hour, exactly 1.852 km/h. It's used in maritime and aviation contexts. For example, ship speeds and wind speeds in meteorology are often measured in knots.

Mach number is the ratio of an object's speed to the speed of sound. Mach 1 = speed of sound (343 m/s at sea level, 20°C). Subsonic: Mach 1, Hypersonic: > Mach 5. Used in aviation and aerospace.

How accurate are the conversions?

All conversions use precise conversion factors defined by international standards. Results are displayed with up to 6 significant figures. Mach number uses the speed of sound at sea level (343 m/s at 20°C).

Is my data sent to a server?

No. All calculations happen entirely in your browser using JavaScript. Your input values are never transmitted over the network. The tool works offline after the page loads.

Tools

Enter value

From

100 km/h62.137100 mph

100 Kilometer per hour equals 62.137100 Mile per hour

Speed Converter — km/h, mph, m/s, knots, ft/s, Mach

Convert between speed units: kilometers per hour, miles per hour, meters per second, knots, feet per second, and Mach number. Essential for travel, aviation, and physics calculations.

Features

✓Convert between speed units: km/h, mph, m/s, knots, ft/s, Mach
✓Support for common speed units used in travel, aviation, maritime, and physics
✓Instant conversion as you type
✓Precise calculations with up to 6 significant figures
✓Clear unit symbols and names for easy identification
✓Swap units with one click to reverse the conversion
✓Copy results to clipboard for use in other applications
✓Works offline — all calculations happen in your browser

How to Use

1Enter a value in the input field. The result updates instantly.
2Choose the source unit and target unit using the dropdowns.
3Click the swap button (⇄) to reverse the conversion direction.
4Click the copy button to copy the result to your clipboard.

Frequently Asked Questions

Related Tools

Unit Converter — Length, Weight, Temperature, Volume, Area

Convert between metric and imperial units for length, weight, temperature, volume, and area. Instant, accurate, and easy to use. Supports mm, cm, m, km, in, ft, yd, mi, mg, g, kg, t, oz, lb, °C, °F, K, mL, L, m³, gal, qt, pt, fl oz, mm², cm², m², km², ha, in², ft², ac.

Time Zone Converter — Convert Time Between Cities

Convert time between different time zones and cities. Find the corresponding time in any city worldwide. Perfect for scheduling meetings across time zones. Supports 30+ time zones including UTC, GMT, EST, CST, PST, CET, JST, and more.