How to Use the Gacha Cost Simulator
This tool calculates average gacha spending and the 95th-percentile worst case before you spend real money. Know your risk before pulling.
Average cost = (target / rate) × unit cost. The worst-case uses the 95th percentile of the negative binomial distribution, approximated as mean + 1.645 × standard deviation. Roughly 5% of players will exceed this amount.
Frequently Asked Questions
Can I exceed the worst-case estimate?
Yes. The 95th percentile means about 5% of players spend more. Budget carefully.
My game has a pity system. Which calculator should I use?
Use the Gacha Pity Calculator for pity-based games — it accounts for the guaranteed pull and gives more accurate results.