Speed Calculator
Calculate speed, distance, or time using v = d / t. Convert between mph, km/h, m/s, knots, and ft/s. Step-by-step solutions included.
Calculate
Choose a calculation type, enter your values, and click Calculate Now to see speed, distance, or time with step-by-step solutions.
Result
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Step-by-Step Solution
Complete User Guide
What is Speed?
Speed is the rate at which an object covers distance. It's calculated as distance divided by time: v = d / t. This calculator lets you solve for any of the three variables (speed, distance, time) and also convert between common speed units.
Key Formulas
Speed: v = d / t
Distance: d = v × t
Time: t = d / v
v = speed, d = distance, t = time
4 Calculation Types
Speed
Enter distance and time to find speed.
Distance
Enter speed and time to find distance.
Time
Enter speed and distance to find time.
Convert
Convert between mph, km/h, m/s, knots, ft/s.
Common Speed Conversions
| From | To | Factor |
|---|---|---|
| 1 km/h | mph | × 0.621371 |
| 1 mph | km/h | × 1.60934 |
| 1 m/s | km/h | × 3.6 |
| 1 knot | km/h | × 1.852 |
| 1 ft/s | mph | × 0.681818 |
Example Calculations
• Speed: 100 km in 2 hours → v = 100 / 2 = 50 km/h
• Distance: 60 km/h for 3 hours → d = 60 × 3 = 180 km
• Time: 300 km at 100 km/h → t = 300 / 100 = 3 hours
Important Notes
- Speed is scalar (magnitude only). Velocity includes direction.
- Average speed = total distance / total time.
- Distance and time must be greater than zero.