# Time Conversion Calculator

> Convert time intervals between subsecond, second, minute, hour, day, week, month, and year units.

Page: https://askcalculators.com/calculator/time-conversion-calculator/
Definition: https://askcalculators.com/calculator/time-conversion-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/time-conversion-calculator/schema.json
Version: 1.0.0
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/time-conversion-calculator/?value=1&fromUnit=day&toUnit=h

## Inputs
- value: Time value; type=number; required; default=1
- fromUnit: From unit; type=select; required; default=day; values=ns|us|ms|s|min|h|day|week|month|year
- toUnit: To unit; type=select; required; default=h; values=ns|us|ms|s|min|h|day|week|month|year

## Outputs
- result: Converted time; format=number; primary
- seconds: Equivalent seconds; format=number

## Formula
seconds = value × seconds-per-source-unit; result = seconds ÷ seconds-per-target-unit

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