Convert between nanoseconds, milliseconds, seconds, minutes, hours, days, weeks, months, years and more.
There are exactly 3,600 seconds in one hour. This is because there are 60 minutes in an hour and 60 seconds in a minute: 60 × 60 = 3,600.
A common year has 365 days. A leap year has 366 days (occurring every 4 years, with some exceptions). For conversions, an average year is approximately 365.2425 days or 31,556,952 seconds.
On average, there are approximately 4.348 weeks in a month (52 weeks ÷ 12 months). Since months have different lengths (28–31 days), the exact number varies.
To convert hours to minutes, multiply by 60. For example, 2.5 hours = 2.5 × 60 = 150 minutes. To convert minutes to hours, divide by 60.
There are exactly 1,000 milliseconds in one second. A millisecond is one-thousandth of a second, often used in computing, sports timing, and audio engineering.