How Many Seconds in a Year?
There are 31,536,000 seconds in a regular year (365 × 24 × 3,600). In a leap year, there are 31,622,400 seconds (366 × 86,400). The leap year adds exactly 86,400 more seconds — one full day.
Quick Answer
Regular Year (e.g. 2026)
31,536,000
seconds (365 × 86,400)
Leap Year (e.g. 2028)
31,622,400
seconds (366 × 86,400)
How to Calculate Seconds in a Year
Start from the smallest unit and multiply up:
Year-by-Year Table (2024–2030)
| Year | Leap Year? | Days | Seconds |
|---|---|---|---|
| 2024 | Yes | 366 | 31,622,400 |
| 2025 | No | 365 | 31,536,000 |
| 2026Current | No | 365 | 31,536,000 |
| 2027 | No | 365 | 31,536,000 |
| 2028 | Yes | 366 | 31,622,400 |
| 2029 | No | 365 | 31,536,000 |
| 2030 | No | 365 | 31,536,000 |
Seconds Per Month
| Month(s) | Days | Hours | Seconds |
|---|---|---|---|
| February (common year) | 28 | 672 | 2,419,200 |
| February (leap year) | 29 | 696 | 2,505,600 |
| April, June, Sep, Nov | 30 | 720 | 2,592,000 |
| Jan, Mar, May, Jul, Aug, Oct, Dec | 31 | 744 | 2,678,400 |
Average month: ~2,628,000 seconds (31,536,000 ÷ 12).
Seconds in Other Time Units
| Unit | Seconds | Calculation |
|---|---|---|
| 1 minute | 60 | 60 |
| 1 hour | 3,600 | 60 × 60 |
| 1 day | 86,400 | 24 × 3,600 |
| 1 week | 604,800 | 7 × 86,400 |
| 1 month (30 days) | 2,592,000 | 30 × 86,400 |
| 1 year (regular) | 31,536,000 | 365 × 86,400 |
| 1 year (leap) | 31,622,400 | 366 × 86,400 |
| 10 years (avg) | 315,576,000 | 365.25 × 86,400 × 10 |
What Can You Do in 31,536,000 Seconds?
To put 31.5 million seconds in perspective:
Heart beats
~42 million
at 80 bpm resting rate
Earth rotations
365
one per day
Moon cycles
~12.4
lunar month ≈ 29.5 days
Light-travel distance
9.46 trillion km
one light-year
Frequently Asked Questions
How many seconds are in a year?
A regular year has 31,536,000 seconds (365 days × 24 hours × 60 minutes × 60 seconds). A leap year has 31,622,400 seconds (366 days × 86,400). The precise tropical year is approximately 31,556,925 seconds.
How many seconds are in a day?
There are 86,400 seconds in a day (24 hours × 60 minutes × 60 seconds).
How many seconds are in an hour?
There are 3,600 seconds in one hour (60 minutes × 60 seconds).
How many seconds are in a month?
Seconds per month depend on the month length: 28-day months have 2,419,200 seconds, 30-day months have 2,592,000 seconds, and 31-day months have 2,678,400 seconds. The average month has approximately 2,628,000 seconds.
How many seconds are in a leap year?
A leap year has 31,622,400 seconds (366 × 24 × 3,600). That is 86,400 more seconds than a regular year — exactly one extra day's worth. The next leap year is 2028.