Speed Calculator

Calculate speed, distance, or time using the speed-distance-time relationship and convert between units.

Result

Fill in the fields above, then press Calculate.

A speed calculator solves for speed, distance, or time using the fundamental motion formula, with automatic unit conversions across imperial and metric systems.

Select what you want to solve for (speed, distance, or time), enter the known values, and choose appropriate units. The calculator uses the formula v = d/t and its rearrangements.

Examples

Calculate speed

A car travels 150 miles in 2.5 hours. Speed = 150 / 2.5 = 60 mph.

Calculate time

A plane flies 500 km at 800 kph. Time = 500 / 800 = 0.625 hours = 37 minutes 30 seconds.

Frequently Asked Questions

What is the difference between mph and knots?
1 knot = 1 nautical mile per hour = 1.15078 mph. Knots are used in aviation and sailing because nautical miles map directly to degrees of latitude.
How do I convert minutes to hours?
Divide minutes by 60. For example, 45 minutes = 45/60 = 0.75 hours.
Related Calculators
Pace Calculator
Distance Calculator
Fuel Cost Calculator
Gas Mileage Calculator

Quick Tips

  • •Time is entered in hours. Use decimals for partial hours (e.g. 1.5 = 1h 30m).
  • •The calculator converts between all speed units automatically.
  • •Knots are commonly used in aviation and marine navigation.