Speed Converter
A free speed unit converter. Convert any speed between km/h, mph, knots, m/s and ft/s instantly, with a quick reference table for common values.
100 km/h equals the values above.
How to convert a speed
Type the value you want to convert and pick its unit (km/h, mph, knots, m/s or ft/s).
The equivalent in all other units appears instantly below — no button needed.
A reference table shows common speeds converted across units at a glance.
Where a speed converter helps
Convert a km/h speed limit to mph (or the reverse) when driving in another country.
Switch between knots and km/h or mph.
Convert m/s (the SI unit) to everyday km/h or mph for physics and homework.
Compare running or cycling speeds recorded in different units.
Benefits
- Converts between km/h, mph, knots, m/s and ft/s in one place.
- Instant — every unit updates as you type, no button to press.
- Includes a common-conversions reference table.
- Free, works in your browser, nothing uploaded.
Measure & convert speed
Frequently asked questions
How do I convert km/h to mph?
Multiply the km/h value by 0.621371 (or divide by 1.60934). For example, 100 km/h = 62.1 mph. Enter any value above to get the exact answer instantly.
How do I convert mph to km/h?
Multiply the mph value by 1.60934. For example, 60 mph = 96.6 km/h.
What is 1 knot in km/h and mph?
1 knot = 1.852 km/h = 1.151 mph. Knots are used for boats and aircraft.
How do I convert m/s to km/h?
Multiply the m/s value by 3.6. For example, 10 m/s = 36 km/h.
Is the converter free?
Yes — completely free, no sign-up, and it works entirely in your browser.
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