Convert Gregorian Years to Centuries
Convert Gregorian Years (yr) to Centuries (cent) instantly and accurately.
Conversion Formula
cent = yr × 0.01
About Gregorian Years
The Gregorian year = exactly 365.2425 days = 31,556,952 s (mean over the 400-year cycle with 97 leap years). The Julian calendar (45 BCE) used 365.25 days; Gregorian reform (1582) dropped 10 days and amended the centennial rule. Britain adopted it in 1752; Greece in 1923. Carbon-14 dates are reported in 'years BP' (before 1950 CE). 1 yr = 365.2425 d = 8,765.82 h = 31,556,952 s.
About Centuries
A century = exactly 100 Gregorian years ≈ 3.156 × 10⁹ s. Standard unit of historical periodisation (the 20th century, the 18th-century Enlightenment). IPCC projects warming and sea-level rise on century timescales. Precession of the equinoxes advances ~1.39°/century, so zodiac constellations no longer match their named seasons. Ice-core and radiocarbon records are commonly displayed at century resolution. 1 century = 100 yr.
Quick Reference Table
| Gregorian Years (yr) | Centuries (cent) |
|---|---|
| 1 yr | 0.01 cent |
| 2 yr | 0.02 cent |
| 5 yr | 0.05 cent |
| 10 yr | 0.1 cent |
| 25 yr | 0.25 cent |
| 50 yr | 0.5 cent |
| 100 yr | 1 cent |