Speed Calculator
Calculate speed, distance, or time using the formula speed = distance ÷ time. Solve for any unknown variable.
Enter any two values to solve for the third.
meters (m)
seconds (s)
m/s
Enter two values to calculate the third.
Speed Formula
Speed = Distance ÷ Time
Distance = Speed × Time
Time = Distance ÷ Speed
Distance = Speed × Time
Time = Distance ÷ Speed
Example: A car travels 150 km in 2 hours.
Speed = 150 ÷ 2 = 75 km/h
Speed = 150 ÷ 2 = 75 km/h
Speed vs Velocity
Speed is a scalar quantity (magnitude only). Velocity is a vector (magnitude + direction). A car moving at 60 km/h has a speed of 60 km/h regardless of direction.
FAQ
What is the SI unit of speed?
The SI unit of speed is meters per second (m/s). Other common units include km/h and mph.
How do I convert m/s to km/h?
Multiply m/s by 3.6 to get km/h. For example, 10 m/s = 36 km/h.
Last updated: 2026-08-08