Convert Days to Megayears
Convert Days (d) to Megayears (Ma) instantly and accurately.
Conversion Formula
Ma = d × 2.737907007e-9
About Days
A day (d) = exactly 86,400 s. Earth's actual solar day varies ±16 s due to orbital eccentricity and axial tilt (equation of time). Leap seconds (abandoned in UTC after 2035) corrected the TAI-UT1 divergence. Mars's sol = 24 h 39 min 35 s ≈ 88,775 s; a Martian year = 668.6 sols. The day structures circadian biology, tides, and planetary science. 1 day = 86,400 s = 24 h.
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.
Quick Reference Table
| Days (d) | Megayears (Ma) |
|---|---|
| 1 d | 2.738 × 10-9 Ma |
| 2 d | 5.476 × 10-9 Ma |
| 5 d | 1.369 × 10-8 Ma |
| 10 d | 2.738 × 10-8 Ma |
| 25 d | 6.845 × 10-8 Ma |
| 50 d | 1.369 × 10-7 Ma |
| 100 d | 2.738 × 10-7 Ma |