Convert Gregorian Years to Olympiads
Convert Gregorian Years (yr) to Olympiads (Ol) instantly and accurately.
Conversion Formula
Ol = yr × 0.25
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 Olympiads
An Olympiad = exactly 4 Gregorian years = 1,461 days = 126,227,808 s. In ancient Greece it was the standard historical dating system counting from the first Olympic Games at Olympia in 776 BCE; adopted by Hellenistic historians (Polybius, Timaeus). Modern Olympiads are numbered from Athens 1896. The 4-year cycle is mirrored in US presidential elections and EU Parliamentary terms. 1 Ol = 4 yr = 126,227,808 s.
Quick Reference Table
| Gregorian Years (yr) | Olympiads (Ol) |
|---|---|
| 1 yr | 0.25 Ol |
| 2 yr | 0.5 Ol |
| 5 yr | 1.25 Ol |
| 10 yr | 2.5 Ol |
| 25 yr | 6.25 Ol |
| 50 yr | 12.5 Ol |
| 100 yr | 25 Ol |