Speed Calculator

Calculate speed, distance, or time — enter any two values to find the third.

h / min / sec

How to use

  • Solve for Speed
    Enter distance and time to find how fast something is moving. Example: 100 km in 2 hours = 50 km/h.
  • Solve for Distance
    Enter speed and time to find how far something has traveled. Example: 60 km/h for 3 hours = 180 km.
  • Solve for Time
    Enter speed and distance to find how long a journey takes. Example: 200 km at 80 km/h = 2h 30min.
  • Unit Conversions
    Results are automatically converted to all common units for your convenience.

What is Speed?

Speed is the rate at which an object moves through distance over time. It is a scalar quantity, meaning it only has magnitude and no direction. Speed is calculated using the formula: Speed = Distance ÷ Time. Common units of speed include kilometers per hour (km/h), miles per hour (mph), and meters per second (m/s).

Speed, Distance and Time Formula

Find Formula Example
SpeedDistance ÷ Time100 km ÷ 2h = 50 km/h
DistanceSpeed × Time60 km/h × 3h = 180 km
TimeDistance ÷ Speed200 km ÷ 80 km/h = 2.5h

Frequently Asked Questions

What is the difference between speed and velocity?

Speed is a scalar quantity — it only measures how fast something moves. Velocity is a vector quantity — it measures both speed and direction. For example, 60 km/h is a speed, while 60 km/h heading north is a velocity.

How do I convert km/h to mph?

Multiply km/h by 0.621371 to get mph. For example, 100 km/h × 0.621371 = 62.14 mph.

What is the speed of light?

The speed of light in a vacuum is approximately 299,792,458 meters per second, or about 1,079,252,848 km/h.

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