Speed Calculator – Calculate Speed from Distance and Time
Calculate average speed from distance traveled and time taken. This free speed calculator converts between km/h, mph, m/s, and knots for running, cycling, driving, or any motion.
Distance and Time
Speed Results
Enter distance and time to calculate speed
Common Speed References
Human Powered:
- Walking: 4-6 km/h (2.5-4 mph)
- Jogging: 8-10 km/h (5-6 mph)
- Running: 12-15 km/h (7-9 mph)
- Cycling: 20-30 km/h (12-18 mph)
- Sprinting: 30-40 km/h (18-25 mph)
Vehicles:
- City speed limit: 30-50 km/h
- Highway speed: 90-120 km/h
- Train: 100-300 km/h
- Airliner: 800-900 km/h
- Sound: 1,235 km/h (Mach 1)
Frequently Asked Questions
How do I calculate average speed?
Divide total distance by total time. For example, 100 km in 2 hours = 50 km/h average speed. This calculator handles unit conversions automatically.
What's the difference between speed and velocity?
Speed is how fast you're going (scalar). Velocity includes direction (vector). A car going 60 mph has speed; 60 mph north has velocity.
How do I convert km/h to mph?
Multiply km/h by 0.621 to get mph. Or divide mph by 0.621 to get km/h. 100 km/h equals about 62 mph.
What is a knot?
A knot is one nautical mile per hour, used in aviation and maritime. One knot equals 1.852 km/h or 1.151 mph.
Why is my average speed lower than expected?
Average speed includes all stops and slow sections. Traffic, hills, and fatigue reduce average speed below your maximum or cruising speed.