Calculate Now
What is a Time Converter?
A time converter switches a duration from one unit into another — seconds, minutes, hours, days, weeks, months, or years — without you doing the multiplication by hand. It's handy for programmers converting API timeout values from milliseconds-adjacent seconds into hours, students working out how many seconds are in a school year, HR teams estimating notice periods in weeks versus months, and anyone trying to translate a video length, a countdown, or a project timeline from one unit to another. Because calendar months and years don't have a single fixed length, this tool uses averaged, astronomically accurate values so long-duration conversions stay consistent.
Conversion Formula
Every unit is converted to seconds first (the base unit), then divided by the target unit's second-equivalent:
Result = value in seconds ÷ (target unit factor)
Common Conversion Factors
| Unit | Equal to (seconds) |
|---|---|
| Second | 1 s (base unit) |
| Minute | 60 s |
| Hour | 3,600 s |
| Day | 86,400 s |
| Week | 604,800 s |
| Month (avg.) | 2,629,746 s |
| Year (avg.) | 31,556,952 s |
Note the month and year figures are averaged (a year is 365.2425 days to account for leap years), which is why they aren't simple multiples of a day — this matches how the calculator's internal table is built.
Worked Example
How many hours are in 3 weeks?
1,814,400 s ÷ 3,600 s = 504 hours
So 3 weeks converts to exactly 504 hours — useful when estimating cumulative work hours or subscription periods.
How to Use This Calculator
- Type in the value you want to convert.
- Choose the unit you're converting from.
- Choose the unit you want the result in.
- Click Calculate for the instant conversion.
Pair this with the Age Calculator if you want your age expressed in a specific unit like total days or weeks lived.
📅 Last reviewed: July 2026 · Formulas verified against RBI/SEBI/IT Dept guidelines.