Time Unit Converter

Written byOleh Soloninupdated 25 September 2026

Value

From

Result

Result60
From unithour
To unitminute
Conversion factor60
Inverse factor0.016667
In other units
second: 3,600 millisecond: 3,600,000 day: 0.041667 week: 0.005952 month: 0.001369 year: 0.000114

Months and years are conventions

Converts time between milliseconds, seconds, minutes, hours, days, weeks, months and years.

Up to a week everything is exact: sixty seconds in a minute, 3,600 in an hour, 86,400 in a day. Beyond that it becomes conventional, because months differ in length and years are sometimes leap years.

Here a year is the Julian 365.25 days and a month a twelfth of that, 30.4375 days. The Gregorian mean is shorter, 365.2425 days, by 10.8 minutes a year. For a conversion with no specific dates the gap does not matter.

How to use

Enter a value.
Choose the unit you are converting from: milliseconds, seconds, minutes, hours, days, weeks, months or years.
Choose the unit you are converting to. Below it you get the factors and the same time in the other units.

Seconds and hours in a day, week and year

Up to a week everything is exact; beyond that the calculator uses averages — a month of 30.4375 days and a year of 365.25. That gives 8,766 hours and 52.18 weeks to the year.

Every row comes from the calculator on this page.
Unit	Seconds	Hours
1 day	86,400	24
1 week	604,800	168
1 month (average)	2,629,800	730.5
1 year (average)	31,557,600	8,766

Big numbers in human units

A million seconds is under two weeks; a billion is almost 32 years. Conversions like these show the scale of numbers that sound similar.

Every row comes from the calculator on this page.
From	To
1,000,000 seconds	11.57 days
1,000,000,000 seconds	31.69 years
90 minutes	1.5 hours
1 month	30.44 days
1 year	52.18 weeks

What this calculator shows

An exact conversion between the pair of units you pick
The conversion factor in both directions
The same quantity in several other units

What to keep in mind

A year is the Julian 365.25 days and a month 30.4375; the Gregorian mean year is 365.2425.
Working between specific dates needs a calendar calculator that knows the length of each month.

FAQs

How many seconds are in a day?

86,400. A week has 604,800, an average month about 2.63 million and a year roughly 31.56 million.

How many hours are in a year?

8,766 in an average year of 365.25 days. An ordinary year has 8,760 and a leap year 8,784.

Why is a year 365.25 days?

Because a leap day is added every four years. The exact Gregorian average is 365.2425, but 365.25 is fine for everyday conversions.

How many days in a month for calculations?

30.44 — 365.25 divided by twelve. Financial calculations sometimes use exactly 30 days, and the results differ slightly.

How many years is a billion seconds?

31.69 years. A million seconds is just 11.57 days.

How many milliseconds are in a second?

A thousand. A minute holds 60,000 and a day 86.4 million.

Worked example

An hour in minutes

Input: 1 hour into minutes

Output: 60 minutes

Note: The trivial case, but the neighbouring rows earn their keep: the same hour is 3,600 seconds, 0.0417 days and 0.000114 years. That last figure explains a good deal about how short an hour of holiday feels.

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Time Unit Converter

Result

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