Utilities Center

Guide

How to Convert Between Time Units (Seconds, Hours, Days, Years)

Understand time unit conversion, the quirks of months and years, and how to convert durations accurately.

Open the Time Converter

A time converter translates a duration between units — seconds to minutes, hours to days, days to years — using fixed relationships for most pairs and averages for calendar-based units.

How time conversion works

Most time units relate by fixed factors: 60 seconds per minute, 60 minutes per hour, 24 hours per day, 7 days per week. Months and years are less uniform — a month averages 30.44 days and a year averages 365.25 days to account for leap years.

Key conversion factors

  • 1 minute = 60 seconds; 1 hour = 3,600 seconds.
  • 1 day = 24 hours = 1,440 minutes.
  • 1 week = 7 days = 168 hours.
  • 1 month ≈ 30.44 days; 1 year ≈ 365.25 days.

How to use the converter

  1. Enter a value and choose its unit.
  2. Choose the target unit.
  3. Read the converted duration.

Examples

90,000 seconds = 25 hours = 1.04 days. A 45-day trial is about 1.48 months or 0.123 years. A 10-year project is about 3,652.5 days or 87,660 hours.

When a time converter is useful

  • Converting durations for billing or timesheets.
  • Understanding expiry or subscription periods.
  • Converting scientific or engineering time figures.
  • Planning schedules across different time units.

Put it into practice

Use the Time Converter right now — free, in your browser, no sign-up required.

Try the Time Converter

More guides

Back to all tools

Related free tools

More free online utilities that pair well with this one — same-category tools for the same task, plus handy extras from other categories.