How do I calculate average speed?

Average speed = Total distance ÷ Total time. For example, if you travel 150 km in 2 hours, your average speed is 75 km/h.

What is the difference between speed and velocity?

Speed is a scalar quantity (magnitude only), while velocity is a vector quantity (magnitude + direction). Speed tells you how fast, velocity tells you how fast and in which direction.

Speed Calculator

Calculate speed, distance, or time — just enter any two values to find the third.

Distance

Unit

Time (Hours)

Minutes

What is the Speed Calculator?

The speed calculator solves the fundamental physics equation relating speed, distance, and time. Enter any two values to instantly find the third. It supports multiple units including km/h, mph, and m/s.

Speed, Distance & Time Formulas

Speed = Distance ÷ Time

Distance = Speed × Time · Time = Distance ÷ Speed

Common Speed Conversions

1 km/h = 0.621 mph = 0.278 m/s
1 mph = 1.609 km/h = 0.447 m/s
1 m/s = 3.6 km/h = 2.237 mph

Frequently Asked Questions

Average speed = Total distance traveled ÷ Total time taken. If you drove 120 km in 2 hours with stops, your average speed is 60 km/h regardless of varying speeds during the journey.

Speed is a scalar quantity (magnitude only) while velocity is a vector (magnitude + direction). A car moving at 60 km/h has a speed of 60 km/h. If it's moving north at 60 km/h, its velocity is 60 km/h north.