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keisanHigh-precision calculations for everyday life and work

Life Progress Rate Taking into Account Human Perceived Time

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Taking into account how the perception of time changes with age, this calculator determines the rate of life progression based on your current age and life expectancy.
Based on Jannet’s Law—“The psychological duration of time (y) at any point in life is proportional to the reciprocal of age (x) (inversely proportional to age)—”
y can be defined as y = 1/(x + 1). (x ≥ 0)
The perceived time up to age x can be calculated using the integral log(x+1), and the rate of life’s passage based on perceived time is log(x+1)/log(y+1).
Lifespan
years old
Current age
years old
The age when one becomes aware of the world
years old
Life Progress Rate %
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