# Drag Performance

> Estimate your vehicle's 1/4 mile elapsed time (ET) and terminal trap speed based on power-to-weight ratio.

Page: https://askcalculators.com/calculator/quarter-mile-calculator/
Definition: https://askcalculators.com/calculator/quarter-mile-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/quarter-mile-calculator/schema.json
Version: 7.0.0
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/calculator/quarter-mile-calculator/?weight=3500&power=400

## Inputs
- weight: Total Weight (lbs); type=number; optional; default=3500
- power: Flywheel Power (HP); type=number; optional; default=400

## Outputs
- result: Result; format=text; primary

## Formula
Estimated elapsed time and trap speed use empirical power-to-weight drag-racing equations.

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

Notice: General estimate; actual results depend on conditions not represented by the entered inputs.