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Velocity Calculator

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Enter any two of distance, time, and velocity - the third is calculated automatically.

Velocity Calculator

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Velocity =
12.5 m/s
Fill in exactly two values, and leave the one you want to solve for blank. Assumes constant velocity.

The formula

Velocity = Distance / Time Distance = Velocity x Time Time = Distance / Velocity
Example

An object traveling 150 meters in 12 seconds: velocity = 150/12 = 12.5 m/s.

Step-by-step guide

  1. Fill in any two values - distance, time, or velocity - and leave the third blank.
  2. Read the calculated result.

Velocity vs. speed - a distinction that matters in physics

In everyday language, "speed" and "velocity" are used interchangeably, but physics draws a real distinction: speed is just a magnitude (how fast), while velocity is a vector - it includes direction. This calculator computes the magnitude, which is what most everyday calculations need, but in more advanced physics problems involving direction changes (like circular motion or projectile paths), the distinction becomes essential.

Common mistakes

Applying this formula to motion with changing speed - it calculates average velocity over the given distance and time, not instantaneous velocity at a specific moment.
Mixing units - entering distance in kilometers with time in seconds gives a technically calculated but practically meaningless result unless both are converted to a consistent unit system first.

Frequently asked questions

Does this calculate average or instantaneous velocity?

Average velocity over the given distance and time - finding instantaneous velocity at one exact moment requires calculus (a derivative of position with respect to time) rather than this simple ratio.

Can I use different units like km/h or mph?

Yes - the formula works with any consistent unit system, not just meters and seconds. Just make sure distance, time, and the resulting velocity units all match each other consistently.

How is velocity related to acceleration?

Acceleration is the rate at which velocity itself changes over time - see our Acceleration Calculator for finding acceleration from a change in velocity.

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