Convert Megayears to Decades
Convert Megayears (Ma) to Decades (dec) instantly and accurately.
Conversion Formula
dec = Ma × 100000
About Megayears
A megayear (1 Ma) = 10⁶ yr ≈ 3.156 × 10¹³ s - the timescale of geology and tectonic evolution. The K-Pg mass extinction at 66.0 Ma; Cambrian explosion ~538.8 Ma; Great Oxygenation Event ~2,400 Ma. Plate motion at 2-10 cm/yr = 200-1,000 km per Ma (Atlantic ~3,000 km wider since Pangaea rifting ~200 Ma ago). Background extinction rate measured in extinctions per million species-years. 1 Ma = 10⁶ yr.
About Decades
A decade = exactly 10 Gregorian years = 315,569,520 s. Climate scientists compute 10-year running means to remove interannual variability; IPCC reports compare decadal temperature anomalies. Moore's Law predicted ~10× transistor density increase per decade. US Census counts are constitutionally mandated each decade. Cultural periods are colloquially labelled by decade (the 1960s, the 1980s). 1 decade = 10 yr.
Quick Reference Table
| Megayears (Ma) | Decades (dec) |
|---|---|
| 1 Ma | 100000 dec |
| 2 Ma | 200000 dec |
| 5 Ma | 500000 dec |
| 10 Ma | 1000000 dec |
| 25 Ma | 2500000 dec |
| 50 Ma | 5000000 dec |
| 100 Ma | 10000000 dec |