Online Tool Store
Speed Converter
Convert speed between kilometers per hour, miles per hour, knots, and meters per second, with every unit shown at once. Runs entirely in your browser.
This works right here on your device — nothing gets sent out.
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Example shown — enter your own value.
All units
| Unit | Value | Copy |
|---|
How it works
- Enter a value and pick the unit you're converting from and to.
- The result updates instantly, with every other unit shown in the table below.
- Use "Swap" to flip the from/to units, or "Copy" any row's value.
The formula
Every unit is defined by how many meters per second it equals, so converting between any two units is one multiply and one divide:
result = (value × from_unit_in_m/s) / to_unit_in_m/s
Example: 100 km/h × 0.27778 (km/h in m/s) = 27.78 m/s, then 27.78 / 0.44704 (mph in m/s) ≈ 62.14 mph.
FAQ
How many km/h is one knot?
One knot is about 1.852 km/h, or roughly 1.15 mph — it's the speed of one nautical mile per hour, used in aviation and at sea.
What's the formula behind the conversion?
Every unit converts through meters per second: your value is multiplied by its unit's meters-per-second factor, then divided by the target unit's factor.
Why does the "All units" table update as I type?
Every supported unit is recalculated live from the same base value, so you can compare km/h, mph, knots, and m/s side by side without converting one at a time.
Is this accurate enough for navigation or aviation use?
The conversion factors are standard (1 mph = 0.44704 m/s, 1 knot = 0.514444 m/s exactly), but this is a general-purpose tool, not certified navigation equipment.
How we compare
| Feature | Online Tool Store | Search engine quick-answer boxes | General unit converter apps |
|---|---|---|---|
| Shows every unit at once, not just one pair | ✓ | One conversion at a time | ✓ |
| No install | ✓ | ✓ | Requires an app |
| One-click copy per unit | ✓ | Manual copy | Varies |
If you need to compare a speed across several units at once — not just one pair — this beats running the same query over and over.