Blox Fruits drop chance calculator
How likely is a drop in the tries you have left, how many tries until the odds are on your side, and how far a quoted drop rate can be trusted. Type the rate yourself: this page ships no preset rates, because none of the old ones had a source.
After 25 tries with no drop at 4.00%, 36.04% of players would still be waiting too.
Check a drop rate
Drops you saw, out of how many tries. The answer is the range of true rates that sample is consistent with (an exact 95% interval).
4 in 100 is consistent with any rate from 1.10% to 9.93%; the interval is 9.0 times as high at the top as at the bottom.
How the odds work
A drop you are grinding for is a repeated roll: each try either drops the item or does not. If the chance per try is p and every try is an independent roll, the chance of at least one drop in N tries is 1 − (1 − p)N. For two or more drops the calculator adds up the binomial probabilities of getting fewer and subtracts them from one. "Tries for 90% odds" is the smallest number of tries that pushes that chance to 90% or more, found by checking the count itself rather than rounding a formula.
The independent roll is an assumption, not a fact about Blox Fruits. If a drop has a pity counter or a guarantee after some number of tries, your real odds are better than the ones shown, and this page has no way to know about it.
Worked example: a 4% drop
Say the rate you have for an item is 4% a try. In 25 tries the chance of at least one drop is 63.96%, and the expected number of drops is exactly 1. Half of players have it by try 17, 90% by try 57 and 99% by try 113. After 50 tries without it, 12.99% of players would still be waiting: unlucky, but about one player in eight.
The average is 25 tries, higher than the 17 that half of players need, because the average counts the long unlucky runs. Two drops need 42 tries for even odds and 96 for 90%, and 50 on average. At 3 minutes a try, 17 tries is 51 minutes and 57 tries is 2.9 hours: the minutes box turns every count into time.
Tries for 50%, 90%, 95% and 99% odds
The same arithmetic for a range of rates, from the script that runs the calculator. Each count is the fewest tries that reaches the odds in the column head, for one drop.
| Chance per try | 50% odds | 90% odds | 95% odds | 99% odds |
|---|---|---|---|---|
| 0.1% | 693 | 2,302 | 2,995 | 4,603 |
| 0.25% | 277 | 920 | 1,197 | 1,840 |
| 0.5% | 139 | 460 | 598 | 919 |
| 1% | 69 | 230 | 299 | 459 |
| 2% | 35 | 114 | 149 | 228 |
| 2.5% | 28 | 91 | 119 | 182 |
| 4% | 17 | 57 | 74 | 113 |
| 5% | 14 | 45 | 59 | 90 |
| 10% | 7 | 22 | 29 | 44 |
| 20% | 4 | 11 | 14 | 21 |
| 25% | 3 | 9 | 11 | 17 |
| 50% | 1 | 4 | 5 | 7 |
Two patterns hold at every rate of 5% or less. The 90% count is 3.2 to 3.4 times the 50% count, and the 99% count is 6.4 to 6.7 times it: going from even odds to near-certainty takes more than six times as many tries. For a quick estimate at small rates, the 50% count is about 69 divided by the rate in percent (69 tries at 1%, 693 at 0.1%) and the 90% count is about 230 divided by it.
How far can a quoted rate be trusted?
A drop rate someone measured is only as good as the number of tries behind it. The table shows the exact 95% interval for samples that all read 4%, and for two that read zero.
| Drops seen | Tries | Measured rate | Consistent with (95%) |
|---|---|---|---|
| 0 | 25 | 0.00% | 0.00% to 13.72% |
| 0 | 100 | 0.00% | 0.00% to 3.62% |
| 1 | 25 | 4.00% | 0.10% to 20.35% |
| 4 | 100 | 4.00% | 1.10% to 9.93% |
| 10 | 250 | 4.00% | 1.93% to 7.23% |
| 40 | 1,000 | 4.00% | 2.87% to 5.41% |
| 100 | 2,500 | 4.00% | 3.27% to 4.84% |
One drop in 25 tries reads as 4%, but it fits any true rate from 0.10% to 20.35%, a range two hundred times as high at the top as at the bottom. Four in 100 still allows 1.10% to 9.93%. It takes about 1,000 tries to narrow a 4% reading to between 2.87% and 5.41%, and 2,500 to get it to 3.27% to 4.84%. No drops in 100 tries does not mean a rate is zero: it is consistent with anything up to 3.62%. Before trusting a rate you found, ask how many tries it came from, and put that count into the checker above.
Why there are no preset rates
Updated September 25, 2026: this page used to offer five preset rates (for fruit spawns, raid weapons and a sea-event chest) and a worked example that named a boss drop at about 4%. None of them came with a source that could be checked, so they are gone, and the worked example above now uses 4% as a plain number. The arithmetic did not change; only the claims about Blox Fruits did.
FAQ
Why are there no preset drop rates?
Because none of the rates this page used to show had a source that could be checked. Type the rate you have, from wherever you got it, and use the rate checker to see how precise it can be.
Does a long dry streak make the next drop more likely?
Not in the model this calculator uses. Each try is a fresh roll, so 50 dry tries at 4% leave the next try at 4%. Only a game mechanic such as a pity counter would change that, and the calculator does not assume one.
What does "tries for 90% odds" mean?
It is the number of tries by which 90% of players would have the drop. One player in ten would still be waiting at that point, which is unlucky but not unusual.
Why is the average number of tries higher than the 50% count?
The average includes the long unlucky runs. At 4% the average is 25 tries, while half of players have the drop by try 17.
How does it work for two or more drops?
Set "Drops you need". At 4% a try, one drop needs 17 tries for even odds and two drops need 42.
What if a boost changes the chance?
Enter the chance you actually have. If a game states that a boost multiplies your chance, multiply first; the calculator does not assume any boost.
How many tries does it take to check a drop rate?
More than most people expect. One drop in 25 tries is consistent with rates from 0.10% to 20.35%; it takes about 1,000 tries to pin a 4% rate to between 2.87% and 5.41%.