Average Velocity Calculator

Calculate average velocity by entering displacement (Δx) and time (Δt) along with their units. You get back the average velocity expressed in m/s, km/h, ft/s, and mph — all at once. Choose your preferred displacement units (meters, kilometers, feet, or miles) and time units (seconds, minutes, or hours) to match your problem. Also try the Displacement Calculator.

Enter the displacement (can be negative for reverse direction)

Enter the time elapsed (must be greater than zero)

Results

Average Velocity (m/s)

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Average Velocity (km/h)

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Average Velocity (ft/s)

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Average Velocity (mph)

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Frequently Asked Questions

What is average velocity?

Average velocity is the total displacement of an object divided by the total time taken. Unlike average speed, it accounts for direction — so it can be zero or even negative if the object returns to or moves past its starting point. See also our calculate Vertical Velocity.

What is the formula for average velocity?

The formula is v_avg = Δx ÷ Δt, where Δx is displacement (change in position) and Δt is the elapsed time. For constant acceleration, it can also be expressed as v_avg = (v₀ + v) ÷ 2, the mean of initial and final velocities.

How is average velocity different from average speed?

Average speed uses total distance traveled (always positive), while average velocity uses displacement — the straight-line change in position including direction. A round trip has zero average velocity but a positive average speed.

Can average velocity be negative?

Yes. A negative average velocity simply means the object moved in the negative direction overall — for example, back toward its starting point. The sign reflects direction, not magnitude. You might also find our find Acceleration Due to Gravity (g) with Acceleration Due to Gravity Calculator useful.

Why is displacement used instead of distance?

Velocity is a vector quantity, so it carries directional information. Displacement captures the net change in position from start to end, while distance measures the total path length regardless of direction. Using displacement preserves the directional nature of velocity.

What units are used for average velocity?

The SI unit for average velocity is meters per second (m/s). Other common units include kilometers per hour (km/h), feet per second (ft/s), and miles per hour (mph). This calculator shows results in all four simultaneously.

Does the calculator handle unit conversions automatically?

Yes. You select your displacement units (m, km, ft, mi) and time units (s, min, h) independently, and the calculator converts everything internally to SI before computing, then outputs the result in m/s, km/h, ft/s, and mph.

What is a real-world example of average velocity?

If a car travels 200 meters east in 40 seconds, its average velocity is 200 ÷ 40 = 5 m/s east. If it then returns to its starting point in another 40 seconds, the total displacement is 0, so the average velocity over the entire trip is 0 m/s — even though it was clearly moving.