Pick what you want to find — speed, distance, or time — then fill in the other two values using the distance, speed, and time fields (with your choice of units), and the Speed Calculator hands back your result along with the formula used and a handy unit conversion.
Result
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Formula Used
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Unit Conversion
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The basic formula is speed = distance ÷ time. This means speed equals the distance traveled divided by the time taken to travel that distance.
Common speed units include meters per second (m/s), kilometers per hour (km/h), miles per hour (mph), feet per second (ft/s), and knots. The calculator converts between different units automatically.
To find average speed, divide the total distance traveled by the total time taken. This gives you the overall average speed for the entire journey, regardless of speed variations during the trip.
No, speed and velocity are different. Speed is how fast something moves (scalar), while velocity includes both speed and direction (vector). This calculator focuses on speed calculations.
Yes! This calculator can solve for any of the three variables: speed, distance, or time. Just select what you want to calculate and enter the two known values.
For most vehicles, the most fuel-efficient speed is typically between 45-65 mph (70-105 km/h). However, this varies by vehicle type, engine, and driving conditions.
The calculator automatically handles unit conversions. For manual conversion: 1 m/s = 3.6 km/h = 2.237 mph, and 1 mph = 1.609 km/h = 0.447 m/s.