Speed Converter

Convert between mph, km/h, m/s, ft/s, and knots. Enter a speed and pick the units.

Converted
—
In the target unit.

Usage Tip

Quick driving conversions: multiply mph by 1.6 for km/h; multiply km/h by 0.62 for mph.

THE MATH
Convert to a base unit, then to the target:
result = value × (from factor ÷ to factor)
Speed is distance over time; converting changes the distance and time units together.
A knot is one nautical mile per hour, used in aviation and at sea.
1 m/s = 3.6 km/h exactly.
Knots are nautical: 1 knot ≈ 1.151 mph ≈ 1.852 km/h.
Highway anchor: 60 mph ≈ 97 km/h; 100 km/h ≈ 62 mph.
Scroll to Top

The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.