Fractured Archive Loot Calculator
Turn team size, contribution and deaths into your unique and pet chances
Your Raid
Use 33.3% for an even split across 3 players.
Contribution Math
- Total raid contribution
- 700
- Your contribution
- 233
- Death penalty
- -0
- Effective share
- 33.33%
Your Chances
Your unique chance per raid
2.48%
1 in 40
- Team unique chance
- 7.43% (1 in 13)
- Group multiplier
- x1.04
- Orion pet chance
- 0.13% (1 in 750)
Specific Unique
Over 50 Raids
- At least one unique
- 71.45%
- At least one Orion
- 6.45%
How the Fractured Archive loot works
Each room awards 100 contribution, except Ocellus, who awards 300 split across his phases. Damage to minions counts toward the room, with soft caps.
The team rolls a base 1/14 unique chance. Group size adds 4% per player above two. Your share of the team's contribution decides who receives the unique if it drops.
A death subtracts 10% of your expected contribution. The calculator applies that penalty before working out your share. Orion is a flat 1/750 and is not affected by any of this.
Related Tools
Frequently Asked Questions
01How does the Fractured Archive loot system work?
Each room is worth 100 contribution, except Ocellus, who is worth 300 split across his phases. Every player's share of the room's damage becomes their contribution. At the end, the team's contribution rolls against a base 1/14 unique chance, and your share of that contribution is your chance at the unique.
02What is the base unique rate in the Fractured Archive?
The base rate is 1/14 per raid. Group size adds 4% per player above two: 3-man groups roll 1/14 x 1.04, 5-man groups 1/14 x 1.12, and 8-man groups 1/14 x 1.24.
03How do deaths affect my unique chance?
A death subtracts 10% of your expected contribution. In a duo your expected contribution is 350 of 700, so each death costs 35 contribution. The calculator applies that penalty before working out your share.
04What is the Orion pet rate?
Orion is a flat 1/750 per raid, independent of contribution, team size and deaths.
05Are these rates final?
They are the rates Jagex published on 3 November 2026. Jagex said it may make a light-touch balance pass, so re-check after a major update.