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Quick answers.

›How do I convert mph to km/h?

Multiply mph by 1.609. So 60 mph ≈ 96.6 km/h. Or just type it in.

›What is a knot?

A knot is one nautical mile per hour, equal to 1.852 km/h or 1.151 mph. Used in marine and aviation contexts.

›How fast is the speed of light?

Light in vacuum travels at exactly 299,792,458 m/s — that's about 670 million mph or 1.08 billion km/h.

›Are running paces supported?

You can convert between any speed units, but for pace conversions (e.g. min/km ↔ min/mile) use a dedicated running pace tool.

›Is the converter free?

Yes — free, no ads, runs in your browser.