How many seconds are in a day? There are 86,400. That comes from 24 hours × 60 minutes × 60 seconds. Below is the full breakdown — seconds, minutes and hours in a day, week, month and year — and the simple maths so you can work out any of them yourself.
For live durations between two dates or times, try our date calculator.
Seconds, minutes, hours in a day
| Unit | In one day |
|---|---|
| Hours | 24 |
| Minutes | 1,440 |
| Seconds | 86,400 |
The maths:
- Minutes in a day: 24 × 60 = 1,440
- Seconds in a day: 1,440 × 60 = 86,400 (or 24 × 60 × 60)
In a week
| Unit | In one week |
|---|---|
| Hours | 168 |
| Minutes | 10,080 |
| Seconds | 604,800 |
(7 × the daily figures.)
In a month
Months vary, so it depends on the length:
| Month length | Hours | Seconds |
|---|---|---|
| 28 days (Feb) | 672 | 2,419,200 |
| 30 days | 720 | 2,592,000 |
| 31 days | 744 | 2,678,400 |
In a year
| Unit | Common year (365 days) | Leap year (366 days) |
|---|---|---|
| Hours | 8,760 | 8,784 |
| Minutes | 525,600 | 527,040 |
| Seconds | 31,536,000 | 31,622,400 |
Fun fact: 525,600 — the minutes in a year — is the number behind the song "Seasons of Love" from the musical Rent.
A note on leap seconds
Very occasionally, a leap second is added to the world's clocks (UTC) to keep them aligned with Earth's slightly irregular rotation. On those rare days, there are technically 86,401 seconds. These are decided by international timekeepers and are being phased out by 2035.
Quick answers
How many seconds are in a day? 86,400 seconds (24 × 60 × 60). Minutes: 1,440. Hours: 24.
How many seconds are in a year? 31,536,000 in a common year, and 31,622,400 in a leap year.
How many minutes are in a day? 1,440 minutes (24 × 60).
Why are there sometimes 86,401 seconds in a day? On rare occasions a leap second is added to UTC to keep clocks in step with Earth's rotation.