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Time Converter

Seconds, minutes, hours, days, and weeks convert exactly, but months and years have no single fixed length — so this converter uses a 365.25-day year and a month of 30.4375 days, exactly one twelfth of that year. That makes questions like how many weeks are in six months answerable with one consistent rule instead of a guess.

In Minutes
0.01667min
1 s = 0.01667 min
Value
From
To
Averaged months and years
This uses the average Gregorian month (30.44 days) and year (365.25 days), not round 30-day months — so three months here is 91.3 days, not 90.
For a real calendar span, use dates
A duration between two actual dates depends on leap years and each month's length. The date-difference calculator handles those; this converter assumes the averages above.
All units
Seconds1
Minutes0.01667
Hours0.0002778
Days0.00001157
Weeks0.000001653
Months0.0000003803
Years0.00000003169
Milliseconds1,000
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Uses your inputs above
0.01667 in minutes. Want to try a variation?

The math

Reviewed 2026
Formula
Multiply or divide by the conversion factor to a base unit.

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Hours
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Example: how time is calculated

Step-by-step with default inputs

Suppose you put the default values into Time Converter:

Value
1
From
Seconds
To
Minutes

Plug those into the formula Multiply or divide by the conversion factor to a base unit. and the result is:

In Minutes
0.01667min
Time units and their conversion factors
UnitSymbolIn seconds
Secondss1
Minutesmin60
Hourshr3,600
Daysd86,400
Weekswk604,800
Monthsmo2,629,800
Yearsyr31,557,600
Millisecondsms0.001

Source: NIST official conversions

How does the time converter work?

Time Converter uses the formula shown in the math card and cites NIST official conversions. Inputs are validated for sensible ranges; results are computed client-side for instant feedback and do not leave your browser.

References: NIST official conversions.

Last reviewed July 2, 2026 · Editorial policy

Frequently asked questions

How many hours are in a week?

168 hours. A week is 7 days of 24 hours each, or 604,800 seconds.

How long is a month in this converter?

30.4375 days — one twelfth of a 365.25-day year, or 2,629,800 seconds. Using this average month keeps month-based conversions consistent instead of depending on which calendar month you pick.

How many seconds are in a year?

31,557,600 seconds, using the 365.25-day average year this converter is built on. A common 365-day calendar year has 31,536,000 seconds.

How accurate is this time calculator?

The math is deterministic — the same inputs always produce the same output, and the formula is shown above. Accuracy of the answer for your situation depends on how well your inputs match reality and how well the formula models the question.

Why does Google show a slightly different conversion?

For most units the answer is identical to many decimal places. Differences usually come from currency rates (which fluctuate intraday — this tool shows the ECB's daily reference rates) or rounding. We display up to 4 decimals.

How do I share my result?

Hit Share at the top of the page. Every input you change is encoded in the URL, so a permalink reproduces exactly what you see. No account needed.