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Time unit converter: from seconds to eons

Convert a duration between second, minute, hour, day, week, ordinary month, common year, lustrum, century, millennium, cron and eon.

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Hour

24 h

Equivalents

Second86400 s
Minute1440 min
Hour24 h
Day1 d
Week0.1428571429 weeks
Ordinary month (30 days)0.03333333333 months
Common year (365 days)0.002739726027 years
Lustrum (5 years)0.0005479452055 lustra
Century0.00002739726027 centuries
Millennium0.000002739726027 millennia
Cron (one million years)2.739726027e-9 crons
Eon (one billion years)2.739726027e-12 eons

Converts the value to seconds and then to the target unit, with these equivalences:

  • 1 min = 60 s; 1 h = 60 min; 1 day = 24 h; 1 week = 7 days
  • Ordinary month = 30 days; common year = 365 days
  • Lustrum = 5 years; century = 100 years; millennium = 1000 years
  • Cron = one million years; eon = one billion years

Use cases

  • Finding how many seconds or hours a period has.
  • Converting geological or astronomical time scales to years.
  • Solving time unit conversion exercises.

How it works

  1. 1

    Type the amount

    Decimals with a dot or a comma are accepted, as are negative values.

  2. 2

    Pick the units

    Choose the source and target units; the result and the equivalents table update instantly.

Technical details

  • Month and year are conventional: real months have 28 to 31 days and leap years 366, so this tool isn't meant for calendar date arithmetic.
  • Lustra, centuries, millennia, crons and eons are counted in common years of 365 days.
  • Results use 10 significant figures; very large or very small values are shown in scientific notation (e.g. 1e-10).

Frequently asked questions

How many seconds are in a year?

A common year of 365 days has 31,536,000 seconds.

What is a cron?

A geological time unit equal to one million years.

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