# Average Velocity from Position Change

> Divide signed position change by elapsed time to find average velocity over an interval.

Page: https://askcalculators.com/science/velocity-time/
Definition: https://askcalculators.com/science/velocity-time/definition.json
JSON Schema: https://askcalculators.com/science/velocity-time/schema.json
Version: 20.13.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/science/velocity-time/?startPos=12&endPos=102&time=9

## Inputs
- startPos: Initial Position (m); type=number; optional; default=0
- endPos: Final Position (m); type=number; optional; default=100
- time: Time Interval (s); type=number; optional; default=10

## Outputs
- velocity: Average signed velocity (m/s); format=number; primary
- displacement: Signed displacement (m); format=number
- kmh: Average signed velocity (km/h); format=number
- mph: Average signed velocity (mph); format=number

## Formula
Average velocity = (end position − start position) / elapsed time.

Elapsed time must be positive. Position change does not reveal the total path length or the final instantaneous velocity.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.