How the probability works
Let p be the chance of a token from one eligible chest and n the number of eligible chests opened. It’s easier to calculate the chance of finding none, then subtract that from 1.
- One chest misses with probability
1 − p. - With independent rolls at the same rate, the probability that all n chests miss is the product of those miss probabilities:
(1 − p)n. - Finding at least one token is the opposite of missing every time, so the probability is
1 − (1 − p)n.
Why treat chests as independent?
The model treats each eligible opening as a fresh roll: a previous miss gives no reason to raise the rate for the next chest. That’s a modeling assumption, not a claim that we can inspect Epic’s server logic. A rate change during Treasure Hours is a separate issue: with different rates, multiply each chest’s own miss probability instead of using one exponent.
Why can a squad multiply the chest count by four?
If four teammates each open 20 eligible chests and a find can count for the whole team, there are 80 chances for a shared find. Multiply the number of rolls, not the per-chest drop rate. If people open different amounts, add the real counts: 20 + 15 + 10 + 5 is 50 rolls, not 80.
Official rate and early community estimates
| Per chest | Status | Where it came from |
|---|---|---|
| 1 in 137,500 | Official | Fortnite Status published this rate for normal matches. The calculator uses it by default. |
| 1 in 700,000 | Estimate | An early community estimate with no verified sample or official rate behind it. The homepage shows it as a historical comparison. |
| 1 in 2,000 | Disputed | A datamining-based community model that multiplies three assumptions: a 1% prize roll, a 10% chance of the top tier given a prize, and an even split between two top-tier rewards. Those weights were never verified as Epic’s server settings. |
Official Treasure Hunters drop rates
All seven normal-match rates per chest, as published by Fortnite Status.
| Treasure | Per chest |
|---|---|
| Weekly Gold Outfit | 1:1,562,500 |
| Pirate Shop Access | 1:137,500 |
| Weekly Vehicle & Decal | 1:7,813 |
| Weekly Pickaxe or Back Bling | 1:568 |
| Weekly Jam Track | 1:391 |
| Weekly Loading Screen | 1:272 |
| Any Gizmo | 1:127 |
Treasure Hours
Fortnite Status announced a 1.5× Pirate Shop Access boost during Treasure Hours. Select sessions can reach 2.0×.
Check Fortnite’s announcements for the exact event times. This tool doesn’t predict the next Treasure Hours window.
| Match | Boost | Per chest |
|---|---|---|
| Normal match | 1.0× | 1:137,500 |
| Treasure Hours | 1.5× | 1:91,667 |
| Select Treasure Hours | 2.0× | 1:68,750 |
The boosted odds are calculated from Epic’s published multipliers and rounded to the nearest whole denominator. Epic did not publish separate per-chest figures for these boosts.
Chance per match by team size
Each column is the number of chests opened per player in one match. The percentages use the official 1-in-137,500 normal-match rate and assume everyone on the team opens that many chests.
Use the Fortnite chest map to plan a route, or follow the guide to check how many chests you’ve opened in Fortnite before entering your count.
| Mode | 5 | 10 | 20 | 40 |
|---|---|---|---|---|
| Solo | 0.003636% | 0.007272% | 0.014544% | 0.029087% |
| Duos | 0.007272% | 0.014544% | 0.029087% | 0.058165% |
| Trios | 0.010909% | 0.021816% | 0.043627% | 0.087235% |
| Squads | 0.014544% | 0.029087% | 0.058165% | 0.116296% |
Try your own numbers with the homepage chest counter.