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Drop Rate Formula:
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The OSRS ToA (Tombs of Amascut) drop rate formula calculates the cumulative probability of obtaining a drop after multiple raid attempts. It uses the formula P = 1 - (1 - p)^k, where p is the base drop probability and k is the number of raids completed.
The calculator uses the drop rate formula:
Where:
Explanation: The formula calculates the probability of getting at least one drop after k independent raid attempts, each with probability p.
Details: Understanding drop probabilities helps players estimate how many raids they might need to complete to obtain desired items, plan their gameplay time, and set realistic expectations for rare drops.
Tips: Enter the base drop probability (typically a small decimal value) and the number of raid attempts. The calculator will show the cumulative probability of obtaining at least one drop after that many attempts.
Q1: What is a typical base drop rate in OSRS ToA?
A: Base drop rates vary by item, with rare items typically having probabilities ranging from 1/100 to 1/1000 or even lower for extremely rare items.
Q2: Does this formula account for dry streaks?
A: Yes, the formula shows the probability of getting at least one drop, which increases with more attempts, but individual results may still vary due to RNG.
Q3: How accurate is this calculation for actual gameplay?
A: The formula provides the mathematical probability, but actual results may differ due to the random nature of drop mechanics in OSRS.
Q4: Can I use this for other OSRS content?
A: Yes, this formula works for any content with independent drop chances, though specific drop mechanics may vary.
Q5: What does a probability of 0.5 mean?
A: A probability of 0.5 (or 50%) means you have a 50% chance of getting at least one drop after the specified number of attempts.