Time Converter

Convert between 30+ time units instantly. Keyboard friendly and accessible.

Crafted by Arifur Rahman

Precision

How does the time converter work?

  • Choose a source unit from the dropdown or tap a popular conversion chip.
  • Enter the duration—results update automatically with a 150 ms debounce.
  • Swap the direction with the central button to flip between units instantly.
  • Adjust precision with Auto significant figures or Fixed decimal settings.
  • Copy formatted results or inspect time definitions via the info tooltip.

What makes this time converter different?

Popular units first

Seconds, milliseconds, minutes, hours, and days stay pinned to the top for quick selection.

Science-ready catalog

Convert shakes, Planck time, and SI prefixes alongside calendar scales without leaving the page.

Accessibility built in

Keyboard-driven dropdowns, live announcements, and visible focus rings meet WCAG-AA.

Console API hook

Use window.convert(value, from, to) to test calculations right inside your browser.

How can I control rounding?

The time converter offers two precision modes:

Auto mode
Adapts between three and eight significant figures and switches to scientific notation for extreme magnitudes.
Fixed mode
Choose exact decimal places from 0–12 to align with engineering or compliance requirements.

Both inputs respect your last-edited field, so you can measure forward or backward conversions without losing context.

Which conversion services are covered?

  • Core scheduling: milliseconds, seconds, minutes, hours, and days.
  • Operational planning: weeks, fortnights, years, decades, and centuries.
  • Scientific timing: SI prefixes from yoctoseconds to gigaseconds, shake, and Planck time.
  • Automation-friendly: Console API exposes window.convert and BigInt fractions.
  • Precision reporting: Auto and Fixed rounding options tailored for compliance.

Unit references

  • International minute = 60 seconds; hour = 3600 seconds; day = 86,400 seconds.
  • Julian year (365.25 days) equals 31,557,600 seconds; decade and century scale proportionally.
  • Shake is defined as 10-8 seconds; Planck time is approximately 5.391247 × 10-44 seconds.

Time Converter FAQs

Which time units are supported?

The converter includes all SI prefixes, everyday units like minutes and hours, calendar scales up to centuries, and specialist units such as shake and Planck time.

How do I convert between seconds and minutes quickly?

Use the popular chips (for example s → min or min → s) or choose units manually—seconds, minutes, hours, and days stay pinned to the top.

Can I tune rounding and significant figures?

Yes—Auto mode adjusts significant figures intelligently, while Fixed mode lets you lock in 0–12 decimal places for precise time reporting.

Does it handle scientific timing?

Absolutely. Convert yoctoseconds, shakes, megaseconds, and Planck time using published constants.

Is there a way to integrate results into scripts?

Open the browser console and call window.convert(value, fromKey, toKey) or window.convertFraction for BigInt-based precision.