Speed tools
Speed Converter
Convert speed and velocity units for driving, running, aviation, marine, physics, and engineering calculations.
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Instant results1 meter per second [m/s] = 3.6 kilometer per hour [km/h]
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View all categories →All speed units
| Unit | Symbol | Conversion factor | Quick links |
|---|---|---|---|
| meter per second | m/s | Base unit | Reference unit |
| kilometer per hour | km/h | 1 kilometer per hour [km/h] = 0.277778 m/s | to m/s from m/s |
| mile per hour | mph | 1 mile per hour [mph] = 0.44704 m/s | to m/s from m/s |
| foot per second | ft/s | 1 foot per second [ft/s] = 0.3048 m/s | to m/s from m/s |
| knot | kn | 1 knot [kn] = 0.514444 m/s | to m/s from m/s |
| Mach | Ma | 1 Mach [Ma] = 340.29 m/s | to m/s from m/s |
| speed of light | c | 1 speed of light [c] = 299792458 m/s | to m/s from m/s |
| inch per second | in/s | 1 inch per second [in/s] = 0.0254 m/s | to m/s from m/s |
| centimeter per second | cm/s | 1 centimeter per second [cm/s] = 0.01 m/s | to m/s from m/s |
Accuracy and Sources
Speed factors use meter per second as the reference unit. Mach is approximate because the speed of sound changes with air conditions. Content was last reviewed on 2026-05-21. For safety-critical work, confirm results against the relevant official standard.
How speed conversion works
Speed conversion changes a measurement from one unit to another using a fixed factor or formula. Use the calculator above for instant results, then check the table and related converter links for common values.
Frequently Asked Questions
View sitemap →What is the base unit for speed?
The reference base unit used on this page is m/s.
Are these speed conversions accurate?
Yes, the calculator uses the conversion factors listed on the page. For critical work, verify results with an authoritative standard.