Speed Calculator
Average speed = distance / time. Enter distance and time; results update instantly.
Distance
Time
Speed (Result)
Step-by-step derivation
Formula: v = d / t (Provide inputs to see the steps.)
Actions
Reference table & sources
| Base Unit | = km/h | = mph | = ft/s | = kn |
|---|---|---|---|---|
| 1 m/s | 3.6 | 2.23694 | 3.28084 | 1.94384 |
| 1 km/h | 1 | 0.621371 | 0.911344 | 0.539957 |
| 1 mph | 1.60934 | 1 | 1.46667 | 0.868976 |
| 1 kn | 1.852 | 1.15078 | 1.68781 | 1 |
Source note: SI and customary conversion factors are supported by NIST and BIPM references. Knot conversion is based on the nautical mile per hour definition.
Use this Speed Calculator to calculate average speed from the distance traveled and total elapsed time. Enter distance, hours, minutes, and seconds, then choose the speed unit for the result.
Speed Calculation Formula
Average speed = distance ÷ time
Using symbols:
v = d ÷ t
Where:
- v = average speed
- d = total distance traveled
- t = total elapsed time
When time is entered as hours, minutes, and seconds:
Total seconds = (hours × 3,600) + (minutes × 60) + seconds
The calculator can display the result in meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), feet per second (ft/s), or knots (kn).
Example
Suppose you travel 120 km in 2 hours.
Average speed = 120 ÷ 2
Average speed = 60 km/h
The average speed for the trip is 60 kilometers per hour.
Important Notes
- The result is average speed over the entire distance and elapsed time.
- It does not show your speed at a particular moment.
- Stops and delays should be included in elapsed time when calculating the average speed for the complete trip.
- Speed does not include direction; velocity includes both speed and direction.
- One knot means one nautical mile per hour.