How many years are in a century?
There are about 100 years in a century, on the Gregorian average, because a century is not a fixed length.
centuries to years
Uses average lengths: a year of 365.2425 days and a month of 30.436875 days.
1 century is 100 years, on the average lengths stated below.
| Unit | Value | Basis |
|---|---|---|
| nanoseconds | 3,155,695,200,000,000,000 | average |
| microseconds | 3,155,695,200,000,000 | average |
| milliseconds | 3,155,695,200,000 | average |
| seconds | 3,155,695,200 | average |
| minutes | 52,594,920 | average |
| hours | 876,582 | average |
| days | 36,524.25 | average |
| weeks | 5,217.75 | average |
| months | 1,200 | average |
| years | 100 | average |
| decades | 10 | average |
| centuries | 1 | average |
The rows marked "average" use a Gregorian mean year of 365.2425 days and a mean month of 30.436875 days, which is that year divided by twelve. A real month is 28, 29, 30 or 31 days, so if you need a real one, use the days between dates calculator with real dates.
Centuries are not a fixed length, so every row in this table is an average rather than an exact figure.
The answer in full
| Gregorian average | 100 |
|---|---|
| In 2026 | a common year |
Why this one cannot be exact
A century is not a fixed length. A month is 28, 29, 30 or 31 days, and a year is 365 or 366. Any single number given for a conversion involving one of them is an average, and a converter that does not say so is guessing on your behalf.
The averages used here are the Gregorian ones: a year of 365.2425 days, which is the mean over the calendar's 400-year cycle, and a month of exactly one twelfth of that, 30.436875 days. If you need a real month or a real year rather than an average one, use the days between dates calculator and give it real dates.
Frequently asked questions
How many years are in a century?
There are about 100 years in a century, on the Gregorian average, because a century is not a fixed length.
Why is this an average rather than an exact number?
Because a century is not a fixed length. A month is 28, 29, 30 or 31 days and a year is 365 or 366. This page uses the Gregorian averages, a year of 365.2425 days and a month of 30.436875 days, and says so on the result. For a real month or a real year, use the days between dates calculator with real dates.