How the Gacha works
The Blox Fruit Gacha gives you a random fruit for Beli. You can roll again after a cooldown, and every roll is a fresh chance. Bad luck on past rolls doesn't make the next one any better.
Why more rolls never means a sure thing
With a 1% chance per roll, 100 rolls gives you about a 63% chance, not 100%. To get to 90% you need around 230 rolls. That's how the maths works for any random roll, which is why the calculator shows a chance and not a promise.
Set your own odds
Odds can change with updates and events, so you type in the chance yourself. Use the odds shown in the game or your own count from past rolls.