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Speed Distance Time Calculator

Calculate speed, distance, or time when you know the other two values. Free physics calculator with unit conversions.

Speed Distance Time Calculator

Calculate speed, distance, or time from the other two values with unit conversions.

Speed = Distance / Time

Result

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Speed Conversions

1 km/h= 0.621 mph
1 mph= 1.609 km/h
1 m/s= 3.6 km/h
100 km/h= 62.1 mph
60 mph= 96.6 km/h

Formulas

S = D / T

D = S x T

T = D / S

How to Calculate Speed, Distance, and Time

Speed, distance, and time are related by the fundamental formula: Speed = Distance / Time. If you know any two of these values, you can calculate the third. This calculator supports multiple units and automatically converts between them.

Common Use Cases

  • Travel planning: How long will a 300 km road trip take at 100 km/h? (3 hours)
  • Running pace: If you run 5 km in 25 minutes, your speed is 12 km/h (7.46 mph)
  • Cycling distance: Cycling at 20 km/h for 1.5 hours covers 30 km
  • Unit conversion: Convert between km/h, mph, and m/s instantly

Understanding Units

The most common speed units are kilometers per hour (km/h) used in most countries, miles per hour (mph) used in the US and UK, and meters per second (m/s) used in science. This calculator handles all conversions automatically so you can mix and match units as needed.

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How to Use

  1. 1Select what you want to calculate: speed, distance, or time.
  2. 2Enter the two known values with their respective units.
  3. 3View the calculated result instantly with common unit conversions.

Frequently Asked Questions

What is the speed distance time formula?
The fundamental formula is Speed = Distance / Time. Rearranged: Distance = Speed x Time, and Time = Distance / Speed. These three forms let you find any value when you know the other two.
How do I convert between km/h and m/s?
To convert km/h to m/s, divide by 3.6. To convert m/s to km/h, multiply by 3.6. For example, 72 km/h = 20 m/s.
What is the difference between speed and velocity?
Speed is a scalar quantity that measures how fast something is moving regardless of direction. Velocity is a vector quantity that includes both speed and direction. This calculator works with speed.
How do I calculate average speed?
Average speed equals total distance traveled divided by total time taken. Note that average speed is not always the same as the average of two speeds, especially for equal-distance segments.
What units can I use?
Common speed units include km/h, mph, m/s, and knots. Distance can be entered in kilometers, miles, meters, or feet. Time can be in hours, minutes, or seconds.

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