Cycling Calorie Burner Calculator

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Reviewed by: David Chen, CFA | OSRS Combat & Mechanics Expert

Optimize your Tombs of Amascut runs with the definitive ToA Calculator OSRS. Calculate your exact purple chest probability based on Raid Level, points, and party performance.

ToA Calculator OSRS

Estimated Purple Chance
— %
Enter values to see your odds

toa calculator osrs Formula:

Purple % = Total Points / [10,500 – (f(Raid Level))]
where f(RL) scales based on difficulty brackets.

Source: OSRS Wiki Drop Mechanics

Variables:

  • Raid Level: The difficulty setting (0-600). Higher levels significantly increase drop rates.
  • Total Points: Points earned from damage, puzzles, and room completion.
  • Party Size: The number of raiders. Points are divided, but the unique pool scales.
  • Deaths: Each death reduces your individual point total (typically by 20% or a fixed amount).

What is toa calculator osrs?

The Tombs of Amascut (ToA) is the third raid in Old School RuneScape, located in the Kharidian Desert. Due to its unique “Invocation” system, the drop rates for rare items like the Tumeken’s Shadow or Osmumten’s Fang fluctuate wildly based on how difficult you make the raid.

A toa calculator osrs allows players to predict their “Purple Chance” (the probability of receiving a unique item in the reward chest). This is vital for determining whether running lower levels faster is more efficient than slower, higher-level expert runs.

How to Calculate toa calculator osrs (Example):

  1. Determine your Raid Level. Suppose you are doing a 300 invocation (Expert).
  2. Calculate your Total Points. A standard deathless solo usually nets around 20,000 to 25,000 points.
  3. At RL 300, the divisor for points is roughly 7,000 points per 1% chance.
  4. Calculation: $21,000 / 7,000 = 3.00\%$. Your chance of a purple is 1 in 33.3.

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Frequently Asked Questions (FAQ):

Does Raid Level affect unique item weight?

Yes. While all uniques can drop at any level, certain items like the Elidinis’ Ward (f) and Tumeken’s Shadow have higher relative weighting in Expert raids compared to Entry raids.

How much do deaths hurt my loot?

In ToA, deaths penalize your points. A death usually costs you a flat amount of points or a percentage, which directly lowers your purple chance proportionally.

What is the maximum purple chance?

The maximum chance for a unique reward from a single chest is capped at 55% per player.

Is 400 invocation better than 300?

Generally, yes. The drop rate increase from 300 to 400 is substantial, often increasing your odds by over 50% if completion time remains similar.