Blox Fruits drop rate calculator
Spawn cycles, raid drops, sea event drops — all probability problems with the same shape. Type a rate and an attempt count to see real odds.
How Blox Fruits drop math works
Fruit spawns, raid rewards, and sea event drops in Blox Fruits all follow the same independent-trial probability rule: each attempt is a fresh roll against the table, and your previous attempts don't change the next one. That's why you sometimes get a Mythical from a raid on your second run and sometimes don't get one in fifty.
The formula is 1 − (1 − p)N, where p is the per-attempt drop chance and N is the count of attempts. It's the same math used by every drop-rate calculator in every game — Blox Fruits just makes it relevant because raids take real time and people want to know whether to keep going.
The "Attempts for 50% odds" cell gives you the median attempts to expect — half the time you'll get the drop by then. The 90% cell tells you the count where it'd be unusual to still be empty-handed.
When to use it
- Estimating raids needed for a target weapon.
- Deciding whether one more reset of the fruit spawn cycle is worth your time.
- Comparing event drop rates between updates.
Worked example
Cursed Captain raid drops the Cursed Dual Katana at roughly 4%. At 25 raids the "at least one" cell shows about 64%. The 50% median is 17 raids; the 90% median is 56. If you've done 50 raids and still don't have it, you're in the unlucky 13%, but not yet in absurd territory.
FAQ
Where do the preset rates come from?
From community testing and developer announcements. They're approximations, not official numbers — Roblox developers can patch rates between updates without telling anyone.
Does the math change for chest farming?
No — chests follow the same independent-trial rule. The presets cover the rough rate categories.
What if I have a lucky boost active?
Multiply your effective p by the boost multiplier (e.g., 1.5 for +50%) and re-enter the rate. The calculator will reflect the new odds.