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 tool runs entirely in your browser. Your files are never uploaded to a server.
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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.