Convert Gigayears to Seconds
Convert Gigayears (Ga) to Seconds (s) instantly and accurately.
Conversion Formula
s = Ga × 3.155695200e+16
About Gigayears
A gigayear (1 Ga) = 10⁹ yr ≈ 3.156 × 10¹⁶ s - the timescale of stellar evolution and cosmology. Universe age: 13.787 ± 0.020 Ga (Planck CMB). Sun: 4.603 Ga old; red giant in ~5 Ga. A 0.1 M☉ red dwarf lives ~10,000 Ga. Uranium-238 half-life = 4.468 Ga (used in radiometric dating). Proton decay (GUT prediction): ~10³⁴ yr = ~10²⁵ Ga. 1 Ga = 10⁹ yr.
About Seconds
The second (s) is the SI base unit of time, defined since 1967 as exactly 9,192,631,770 periods of the caesium-133 ground-state hyperfine transition at 0 K. Caesium fountain clocks realise this to ~10⁻¹⁶ (1 s lost per ~300 million years); optical lattice clocks (Sr, Yb) reach ~10⁻¹⁸. The second links to the metre via the defined speed of light c = 299,792,458 m/s exactly. 1 s = 1,000 ms = 1/60 min.
Quick Reference Table
| Gigayears (Ga) | Seconds (s) |
|---|---|
| 1 Ga | 3.156 × 1016 s |
| 2 Ga | 6.311 × 1016 s |
| 5 Ga | 1.578 × 1017 s |
| 10 Ga | 3.156 × 1017 s |
| 25 Ga | 7.889 × 1017 s |
| 50 Ga | 1.578 × 1018 s |
| 100 Ga | 3.156 × 1018 s |