Buddha Abhidhamma - Ultimate Science - BuddhaNet

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belong to the catumahàràjikà plane. They do not have
fixed life-spans.
4 Devas and brahmas in celestial planes have fixed lifespans.
TABLE 5.2
Spans of Celestial Devas
Deva -plane Respective Human year
deva -year
Catumahàràjikà 500 9,000,000
Tàvatiüsà 1000 36,000,000
Yàmà 2000 144,000,000
Tusità 4000 576,000,000
Nimmànarati 8000 2,314,000,000
Paranimmita Vasavatã 16000 9,216,000,000
Notes:
i A celestial day in upper Catumahàràjikà is equal to 50
human years; a celestial day in Tàvatiüsà is equal to
100 human years; a celestial-day in Yàmà is equal to
200 human years; and so on. Thirty celestial days make
a month and 12 months make a year.
ii As we go up from a lower plane to a higher plane, the
life-term is doubled and the length of the celestial day
is also doubled. So the time in human years is increased
by four times. This is the key to remember the life-spans
of different deva-planes – double the celestial years and
multiply the human years by 4 as one goes up the ladder.