# Conversion Calculator

> Convert between different units for length, weight, and temperature.

Page: https://askcalculators.com/calculator/conversion-calculator/
Definition: https://askcalculators.com/calculator/conversion-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/conversion-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/conversion-calculator/?category=length&value=1&fromUnit=m&toUnit=ft

## Inputs
- category: Category; type=select; optional; default=length
- value: Value; type=number; optional; default=1
- fromUnit: From Unit; type=text; optional; default=m
- toUnit: To Unit; type=text; optional; default=ft

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

## Formula
Value in target units = value in source units × source conversion factor ÷ target conversion factor.

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