Time converter
Turn any amount of time into seconds, minutes, hours, days, weeks, months or years.
From NIST's definitions of the minute, hour and day.
Show the workings
| Step | Sum | Answer |
|---|---|---|
| 1 day in seconds | 1 × 86,400 | 86,400 seconds |
| In hours | 86,400 ÷ 3,600 | 24 hours |
Where the figures come from
- Seconds in a minute: 60 seconds. Source: NIST Guide to the SI, section 5.1.1, Table 6: units accepted for use with the SI. Checked 14 November 2026.
- Minutes in an hour: 60 minutes. Source: NIST Guide to the SI, section 5.1.1, Table 6: units accepted for use with the SI. Checked 14 November 2026.
- Hours in a day: 24 hours. Source: NIST Guide to the SI, section 5.1.1, Table 6: units accepted for use with the SI. Checked 14 November 2026.
- A leap year comes every this many years: 4 years. Source: Calendar (New Style) Act 1750, section 2. Checked 14 November 2026.
- Hundredth years are common years, not leap years: 100 years. Source: Calendar (New Style) Act 1750, section 2. Checked 14 November 2026.
- Except every fourth hundredth year, which is a leap year: 400 years. Source: Calendar (New Style) Act 1750, section 2. Checked 14 November 2026.
- Days in a common year: 365 days. Source: Calendar (New Style) Act 1750, section 2. Checked 14 November 2026.
How it converts
Everything is turned into seconds and back. A minute is 60 seconds, an hour is 60 minutes and a day is 24 hours, as the US National Institute of Standards and Technology lists them among the units accepted with the SI. A week is 7 days. A year is the calendar's average, 365.2425 days, and a month is a twelfth of a year, because years and months differ in length.
Common questions
- How many seconds are in a day? 86,400 seconds in a day.
- How many minutes are in a day? 1,440 minutes in a day.
- How many seconds are in an hour? 3,600 seconds in an hour.
- How many hours are in a week? 168 hours in a week.
- How many minutes are in a week? 10,080 minutes in a week.
- How many weeks are in a month? 4 weeks and 0 to 3 days: 4.348 weeks on average.
- How many hours are in a month? 720 hours in a 30-day month, 744 in a 31-day month, and 730.485 on average.
- How many hours are in a year? 8,760 hours in a year of 365 days, and 8,784 in a leap year.
- How many minutes are in a year? 525,600 minutes in a year of 365 days, and 527,040 in a leap year.
- How many seconds are in a year? 31,536,000 seconds in a year of 365 days, and 31,622,400 in a leap year.
Definitions checked 14 November 2026.