Physics & Travel • Unit Conversion

Speed Calculator

Calculate Speed, Distance, or Time instantly. Convert between km/h, mph, m/s, and more. Perfect for physics problems or trip planning.

Calculated Speed

50 km/h

Conversions

Meters / Second 13.89 m/s
Miles / Hour 31.07 mph
Kilometers / Minute 0.83 km/min
Knots 26.99 kn

Instant Results

Values update automatically as you type. No waiting.

Smart Conversions

See your result in multiple units like km/h, mph, and m/s simultaneously.

Multi-Mode

Calculate Speed, Distance, or Time with a single tool.

How to Calculate Speed, Distance & Time

The relationship between speed, distance, and time is fundamental in physics and everyday life. The basic formula is:

Speed = Distance / Time

Depending on what you want to find, you can rearrange this formula:

  • To find Distance: Speed × Time
  • To find Time: Distance / Speed
  • To find Speed: Distance / Time

Common Units

  • km/h (Kilometers per hour): Standard unit for driving in most of the world.
  • mph (Miles per hour): Standard unit for driving in the US and UK.
  • m/s (Meters per second): SI unit for scientific calculations.
  • Knots: Used in aviation and maritime navigation (1 knot = 1.15 mph).

Frequently Asked Questions

How do I convert km/h to mph?

To convert kilometers per hour to miles per hour, divide the km/h value by 1.609. Roughly, 100 km/h is equal to 62 mph.

What is the formula for average speed?

Average Speed is calculated by dividing the Total Distance traveled by the Total Time taken. Speed = Total Distance / Total Time.

How fast is Mach 1?

Mach 1 is the speed of sound. At sea level and 20°C, it is approximately 1,235 km/h (767 mph) or 343 m/s.