THE NUMBER
How many seconds are in a year?
A standard 365-day year has exactly 31,536,000 seconds. A leap year, with its extra day, has 31,622,400. Averaged over the long run to account for leap years, a year is 31,557,600 seconds.
That is the building block of every bigger number — a decade, a career, a whole life. Below is the full reference, from a single minute up to eighty years.
| Time | Seconds |
|---|---|
| Minute | 60 |
| Hour | 3,600 |
| Day | 86,400 |
| Week | 604,800 |
| Month (30 days) | 2,592,000 |
| Year (365 days) | 31,536,000 |
| Leap year (366 days) | 31,622,400 |
| Decade | 315,360,000 |
| Lifetime (80 years) | 2,524,608,000 |
A year is 365 times 86,400 seconds. Every other figure is built the same way, by multiplying days by the 86,400 seconds in a day.
FROM ONE YEAR TO A WHOLE LIFE
One year is 31.5 million. A life is about 2.5 billion.
Stack 80 of these years together and you get roughly 2,524,608,000 seconds — the length of an average lifetime. Enter your age to see how many of yours are already spent, and how many are likely left.
YOUR PERSONAL NUMBER
Enter your age above to see your personal seconds count.
Want the full picture? How many seconds are in a lifetime breaks the number down by country and by unit.
COUNT BETTER, TOGETHER
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