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Units and Conversions

Speed Converter

Convert speed between kilometres per hour, miles per hour, metres per second and knots for driving, sport or weather.

Your results

Result in mph62.1371 mph

Calculation breakdown

Conversion
Result = value × (from unit's km/h) ÷ (to unit's km/h)

Worked example

A 100 km/h speed limit is approximately 62.14 miles per hour.

Assumptions

  • Uses exact conversion factors based on the international mile and nautical mile.

How this calculator works

This calculator converts a speed value between kilometres per hour, miles per hour, metres per second and knots. Kilometres per hour is the standard unit on Australian speedometers and speed limit signs, while miles per hour and knots are useful for comparing overseas vehicles, aircraft or marine speeds.

Frequently asked questions

What speed unit is used on Australian roads?

Australian speed limits and speedometers use kilometres per hour (km/h) as the standard unit.

How do knots relate to km/h?

One knot equals one nautical mile per hour, which is approximately 1.852 kilometres per hour, commonly used in aviation and boating.

Can I convert an American car's mph speedo to km/h?

Yes, select miles per hour as the source unit and kilometres per hour as the target for an instant conversion.

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