Gacha Pull Probability Calculator

How it is calculated

Each pull is treated as an independent trial with the same drop rate. none = (1 − p)n is the chance of missing every time, and chance = 1 − (1 − p)n is the chance of at least one hit. Here p = rate ÷ 100, with the rate entered as a percentage (0 to 100), and n is the number of pulls. A fractional number of pulls is cut down to a whole number. The tool does not model pity counters, soft pity, 50/50 rules or guaranteed pulls: it assumes a flat rate on every pull, so the true odds in a game with pity are higher than shown near the pity limit. Check the rate your game publishes.

Common mistakes

• Entering the rate as a decimal. 0.6% must be typed as 0.6, not 0.006; typing 0.006 means 0.006%.
• Typing a percent sign in the rate box. Only the number is accepted, and an entry like 0.6% gives no result.
• Reading the result as a guarantee. 41.82% at 90 pulls means a 58% chance of getting nothing, and every new pull starts from the same odds again.
• Applying it to a game with pity or a rate that rises over time. This tool assumes a constant rate on every pull.
• Counting one item among several featured ones. Use the rate of the exact item you want, not of the whole rarity tier.