Draw Rate Calculator

Warning: This is experimental, and may produce incorrect results. You are responsible for verifying any results before you use them.

Built-in draw rates last updated 2017-03-05.

Probability of drawing a particular number of items from the selection in N draws

Bookmark this page to save your wishlist and settings. Updates to the draw rate input list are not currently saved.

Results will be slightly (~1%) off from the real rate as calculations are made by summing the individual draw rates, which are given rounded.

Draws are currently only calculated as single draws. In 10-part draws, real SR rates will be slightly higher and real R rates will be slightly lower. If you know how to efficiently calculate the cumulative probability of two binomial distributions with different probabilities, I'd like to hear from you.