What is the Speed Converter?
Convert any speed unit to all others at once — m/s, km/h, mph, kn, ft/s. Speed units include km/h, mph, meters per second, feet per second and knots, used in driving, sports, aviation and weather forecasts.
How to use the Speed Converter
- Enter your value, your from unit.
- Results update automatically as you type; you can also press Calculate.
- Read the output: meter per second (m/s), kilometer per hour (km/h), mile per hour (mph), knot (kn).
- Check the chart to see how the conversion scales.
Formula and method
Worked example
With value = 1, from unit = Meter per Second (m/s), the Speed Converter returns meter per second (m/s): 1 m/s; kilometer per hour (km/h): 3.6 km/h; mile per hour (mph): 2.23693629205 mph.
When an all-in-one speed converter helps
A sailing forecast shows winds of 25 knots and you want to know what that means in mph before heading out. Converting gives about 29 mph, enough to make small-boat sailing difficult.
A physics student needs a car’s 90 km/h speed in meters per second for a stopping-distance problem. Converting gives 25 m/s.
Watch out for these mix-ups
- Treating knots and mph as the same.
- Putting km/h into physics formulas that need m/s.
- Rounding wind speeds used for safety decisions.
- Confusing speed with running pace per mile or kilometer.
Tips for better results
- Divide km/h by 3.6 for m/s.
- Use knots for sailing and aviation, as charts and forecasts do.
- Switch to minutes per mile or kilometer when planning runs.
💡 Practical tip: One knot is one nautical mile per hour, about 1.15 mph or 1.85 km/h.
Frequently asked questions
What does the Speed Converter do?
Convert any speed unit to all others at once — m/s, km/h, mph, kn, ft/s.
How is it calculated?
The Speed Converter uses this method: value in target = value × (factor of source ÷ factor of target).
Can you show an example?
With value = 1, from unit = Meter per Second (m/s), the Speed Converter returns meter per second (m/s): 1 m/s; kilometer per hour (km/h): 3.6 km/h; mile per hour (mph): 2.23693629205 mph.
Is the Speed Converter accurate?
Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.
Is this tool free and private?
Yes — the Speed Converter is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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