Speed Converter (km/h, mph, m/s, knots)
By Santaji GadepatilinUpdated October 27, 2026
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Type in any field to change it. Press × on a value to calculate that field instead.
How to use this converter
Type a speed in any unit and the others update instantly.
Formula
mph = km/h × 0.621371 m/s = km/h ÷ 3.6 1 knot = 1.852 km/h
Example: 100 km/h = 62.1 mph = 27.8 m/s = 54.0 knots.
Conversion table
| km/h | mph |
|---|---|
| 30 km/h | 18.6411 mph |
| 50 km/h | 31.0686 mph |
| 60 km/h | 37.2823 mph |
| 80 km/h | 49.7097 mph |
| 100 km/h | 62.1371 mph |
| 120 km/h | 74.5645 mph |
| 130 km/h | 80.7783 mph |
| mph | km/h |
|---|---|
| 20 mph | 32.1869 km/h |
| 30 mph | 48.2803 km/h |
| 40 mph | 64.3738 km/h |
| 55 mph | 88.5139 km/h |
| 65 mph | 104.607 km/h |
| 70 mph | 112.654 km/h |
| 80 mph | 128.748 km/h |
Quick conversions
- km/h → m/s: divide by 3.6 (36 km/h = 10 m/s)
- km/h → mph: multiply by 0.6 for an estimate (100 km/h ≈ 60 mph)
- Knots are used at sea and in aviation; 1 knot = 1 nautical mile per hour.
Reference speeds
| km/h | |
|---|---|
| Walking | 5 |
| Cycling | 15–25 |
| Sprinting (elite) | ~37 |
| Commercial jet cruise | ~900 |
| Speed of sound (sea level, 20 °C) | ~1,235 |
Frequently asked questions
How do I convert km/h to mph?
Multiply by 0.621371. 80 km/h ≈ 49.7 mph.
How do I convert m/s to km/h?
Multiply by 3.6. 10 m/s = 36 km/h.
What is a knot?
One nautical mile (1,852 m) per hour, about 1.15 mph.