Time Converter
Seconds up through years, all in one place — useful whenever a duration is given in one unit but needed in another, from converting a stopwatch reading to years for a long-term projection.
Inputs
Result
60 Minute
How it works
- 11 Hour → base = 3,600
- 2Base → Minute = 60
How the time converter works
All units convert through seconds as the base — 1 Minute = 60 s, 1 Hour = 3,600 s, 1 Day = 86,400 s, 1 Week = 604,800 s, 1 Month = 2,629,800 s (an average month), 1 Year = 31,557,600 s (an average year, accounting for leap years).
Worked example: 1 million seconds to days
- 1,000,000 ÷ 86,400 ≈ 11.57 days.
- This is a genuinely useful benchmark: a million seconds is just under 12 days, while a billion seconds is closer to 31.7 years — a striking illustration of how quickly scale compounds between a million and a billion.
Common mistakes to avoid
Assuming 'month' has one fixed, universal length
This calculator uses an average month length (2,629,800 seconds, based on a 365.25-day year divided by 12) since actual months vary from 28 to 31 days — for exact calendar-specific month calculations, a dedicated date tool like the Date Difference Calculator handles real calendar months more precisely.
Using a flat 365-day year instead of accounting for leap years in the 'year' conversion
This converter's 'year' value (31,557,600 seconds) is based on 365.25 days specifically to account for the extra day added roughly every 4 years — a plain 365-day year assumption would drift slightly out of sync with true elapsed time over many years.
Frequently asked questions
Why is the 'month' conversion an average rather than an exact figure?
Because real months vary in length (28 to 31 days), there's no single 'correct' seconds-per-month value — this calculator uses the mathematically averaged figure across a full year, which is the most reasonable single number for general-purpose conversion.
How many seconds are in a full day?
Exactly 86,400 — this comes from 24 hours × 60 minutes × 60 seconds, and is one of the few time conversions with no ambiguity or approximation involved.
Why does a year have 31,557,600 seconds rather than the 'simpler' 31,536,000 (365 × 86,400)?
This calculator uses 365.25 days per year (accounting for the extra day added roughly every 4 years by leap years) rather than a flat 365, giving a more astronomically accurate average year length for long-duration conversions.
Is this the same conversion the Screen Time Calculator uses for its yearly projections?
That calculator performs a similar seconds/days/years-style conversion internally for its own specific projection — this tool exposes the same general time-unit conversion as a standalone utility for any duration conversion need.
Related calculators
Date Difference Calculator
Days, weeks and months between any two dates.
Screen Time Calculator
How much of your life goes to screens.
Countdown Calculator
Time remaining until an important date.
Add Days Calculator
Add or subtract days from a date.
Week Number Calculator
ISO week number for any date.