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