Multi-Leg Average Speed Calculator

Add journey legs and calculate total distance divided by total time, avoiding the common mistake of taking the simple arithmetic mean of leg speeds.

Distance unit

Time unit

—True average speed

—Total distance

—Total time

—mph

—m/s

Average speed = total distance ÷ total elapsed time

Do not average the individual leg speeds unless the time weights are equal.

Physics model preflight

Check the governing model before trusting the number

time-weighted trip average

v̄ = Σdistance / Σtime

Reading the current native inputs…

Every leg uses non-negative distance and positive elapsed time. Do not arithmetic-average leg speeds. This is an idealized educational model: unit consistency and valid inputs do not guarantee that omitted effects are negligible in a real system.

State the model before trusting the number

Classical formulas are only as good as their assumptions and units. Air resistance, damping, deformation, non-constant forces and measurement uncertainty are not silently invented when the selected model does not include them.

How to use this Multi-Leg Average Speed Calculator

Add journey legs and calculate total distance divided by total time, avoiding the common mistake of taking the simple arithmetic mean of leg speeds.

Governing physics model

v̄ = Σdistance / Σtime — time-weighted trip average.

How to verify the result

Use total distance divided by total time. A simple arithmetic mean of leg speeds is generally wrong when leg times differ.

Domain and assumption boundary

Every leg uses non-negative distance and positive elapsed time. Do not arithmetic-average leg speeds. The calculator does not silently add drag, damping, deformation, varying fields, relativistic effects, measurement uncertainty, or geometry that the selected model does not contain.