What is the Gacha Pull Expected Count Calculator?
Before spending on gacha pulls, use this calculator to see your realistic odds. Enter the item drop rate and number of pulls to get the expected item count and full probability distribution: chances of getting 0, 1+, 2+, or 3+ copies. Based on binomial distribution for accurate results.
Formulas (Binomial Distribution)
- Expected Count = n × p
- P(0 items) = (1−p)^n
- P(1+ items) = 1 − P(0)
- P(2+ items) = 1 − P(0) − P(exactly 1)
Frequently Asked Questions
Can I still get 0 items after 100 pulls at 3%?
Yes — the probability is about 4.76%. That means roughly 1 in 20 players gets nothing after 100 pulls, even at 3% odds.
Does this apply to games with pity systems?
Pity (guaranteed pull after N tries) means P(0) is effectively 0% beyond the pity threshold. This calculator shows pure probability without pity.
If the expected count is 3, will I always get exactly 3?
No — expected value is the average across many trials. Actual results range from 0 to the full pull count. The distribution shows how likely each outcome is.