Speed Converter

Speed limits, running pace, wind reports, and boat travel all use different units depending on the country and the activity. This converter moves any speed through meters per second so mph, km/h, knots, and m/s all line up.

How it works

Speeds convert through meters per second.

Meters per second is the base, the unit physics uses. From there, the everyday units fall out: 1 mph is 0.44704 m/s and 1 km/h is 0.277778 m/s, which is why the mph-to-km/h factor works out to almost exactly 1.609.

Knots, used in marine and aviation contexts, are nautical miles per hour. One knot is 0.514444 m/s, slightly faster than 1 mph, because a nautical mile is longer than a statute mile.

Result = (value × m/s-per-source-unit) ÷ m/s-per-target-unit.

Worked examples

• Convert 60 mph to km/h. → 96.56 km/h

  60 × 0.44704 m/s = 26.8224 m/s, divided by 0.277778 = 96.56 km/h.

• Convert 20 knots of wind to mph. → 23.02 mph

  20 × 0.514444 = 10.2889 m/s, divided by 0.44704 = 23.02 mph.

Tips & gotchas

• A useful anchor: 60 mph is about 96.6 km/h, and 100 km/h is about 62 mph — handy for reading speed limits abroad.
• To turn m/s into a rough km/h, multiply by 3.6. Wind reported as 10 m/s is therefore about 36 km/h.
• Knots are not the same as km/h. A '20 knot' wind is about 37 km/h, not 20 — a common misread on weather apps.
• Running pace (minutes per mile or km) is the inverse of speed, not a direct unit here. Convert pace to a speed first if you want km/h.

FAQ

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