Convert Seconds to Planck Time
Convert Seconds (s) to Planck Time (t_P) instantly and accurately.
Conversion Formula
t_P = s × 1.854858440e+43
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.
About Planck Time
The Planck time (t_P) = √(ℏG/c⁵) ≈ 5.391 × 10⁻⁴⁴ s — the time for light to travel one Planck length (~1.616 × 10⁻³⁵ m). Below this scale, general relativity and quantum mechanics both break down; a theory of quantum gravity is needed. No physical process or instrument approaches this timescale — it is a theoretical lower bound. Introduced by Max Planck in 1899. 1 t_P ≈ 5.391 × 10⁻⁴⁴ s.
Quick Reference Table
| Seconds (s) | Planck Time (t_P) |
|---|---|
| 1 s | 1.855 × 1043 t_P |
| 2 s | 3.71 × 1043 t_P |
| 5 s | 9.274 × 1043 t_P |
| 10 s | 1.855 × 1044 t_P |
| 25 s | 4.637 × 1044 t_P |
| 50 s | 9.274 × 1044 t_P |
| 100 s | 1.855 × 1045 t_P |