Planck time
Planck time is the theoretical shortest meaningful interval of time, defined using fundamental physical constants.
5.391 × 10⁻⁴⁴ sTimeEveryday quantities
Planck time vs Blink of an eye
What are they, and what does the difference actually look like?
Two things. One honest scale.
Meet the pair
What these two things are
Blink of an eye
A blink of an eye is the quick closing and opening of the eyelid, usually happening involuntarily.
150 msTimeBlink of an eye lasts about 2.78 × 10⁴² times as long as Planck time.
01
Planck time5.391 × 10⁻⁴⁴ sTime
02
Blink of an eye150 msTime
Both timelines start together. Length measures elapsed time, not a physical distance.
Measurements, assumptions & sources +
Planck time
A theoretical scale, not an experimentally demonstrated smallest time step.
NIST — 2022 CODATA fundamental constants
The marked time is calibrated. Unmeasured illustration details are representative.
Blink of an eye
A chosen 150 ms interval, not a universal blink duration.
Defined examples — our methodology
The marked time is calibrated. Unmeasured illustration details are representative.
Change the comparison
Put something else beside it.
Measurement details
Why these numbers?
The visual compares time with time. The records below preserve each value’s basis and caveats.
Planck time
5.391 × 10⁻⁴⁴ sTime · theoretical
A theoretical scale, not an experimentally demonstrated smallest time step.
Blink of an eye
150 msTime · reference interval
A chosen 150 ms interval, not a universal blink duration.
- Comparing
- Time ↔ Time
- Relative size
- Blink of an eye is larger on this measurement by a factor of about 2.78 × 10⁴².
How to read the visual
The labelled spans and stored measurements determine the scale; unmeasured illustration details do not.
- Planck time is labelled theoretical; treat the displayed value as a comparison anchor rather than false precision.
- Blink of an eye is labelled reference interval; treat the displayed value as a comparison anchor rather than false precision.
There’s always another scale
Follow your curiosity.
TimePlanck time5.391 × 10⁻⁴⁴ sPlanck time is the theoretical shortest meaningful interval of time, defined using fundamental physical constants.TimeBlink of an eye150 msA blink of an eye is the quick closing and opening of the eyelid, usually happening involuntarily.TimeHuman lifetime80 yearsA human lifetime is the span from a person's birth to their death.
TimeAge of Earth4.54 GyrThe age of Earth is the time that has passed since the planet formed from the solar nebula.TimeAge of the universe13.8 GyrThe age of the universe is the time since the Big Bang, marking the beginning of cosmic expansion.Side by side
Another point of view.
