Convert Planck Time to Seconds
Convert Planck Time (t_P) to Seconds (s) instantly and accurately.
Conversion Formula
s = t_P × 5.391247000e-44
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.
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
| Planck Time (t_P) | Seconds (s) |
|---|---|
| 1 t_P | 5.391 × 10-44 s |
| 2 t_P | 1.078 × 10-43 s |
| 5 t_P | 2.696 × 10-43 s |
| 10 t_P | 5.391 × 10-43 s |
| 25 t_P | 1.348 × 10-42 s |
| 50 t_P | 2.696 × 10-42 s |
| 100 t_P | 5.391 × 10-42 s |