Speed Calculator
Compute speed, distance, or time and convert between units
🚀
Speed Calculator
Provide any two values to compute the third in the classic speed–distance–time relationship. Includes a speed unit converter and helpful references.
Quick Navigation
🧮 Speed · Distance · Time
Enter any two values below and click Calculate to find the third.
📊 Result
Enter two values and click Calculate.
🔁 Speed Converter
📊 Result
Enter an amount and choose units, then click Convert.
Speed, distance, and time
What is speed?
Speed is defined as the change of position of an object over time. In the International System of Units (SI), speed is measured in meters per second (m/s). Other units include kilometers per hour (km/h), miles per hour (mph), feet per second (ft/s), and more.
The relationship between speed, distance, and time
speed = distance / time
- Distance = speed × time
- Time = distance / speed
Example:
Riding a bicycle at 10 m/s for 1 minute: distance = 10 × 60 = 600 m.
Common units of speed
| m/s | km/h | mph | kn | ft/s | |
|---|---|---|---|---|---|
| 1 meter/second [m/s] = | 1 | 3.6 | 2.236928 | 1.943844 | 3.280840 |
| 1 kilometer/hour [km/h] = | 0.277778 | 1 | 0.621369 | 0.539957 | 0.911344 |
| 1 mile/hour [mph] = | 0.44704 | 1.60935 | 1 | 0.868979 | 1.466672 |
| 1 knot [kn] = | 0.514444 | 1.852 | 1.150775 | 1 | 1.687810 |
| 1 foot/second [ft/s] = | 0.3048 | 1.09728 | 0.681816 | 0.592484 | 1 |