1. What is the OSRS ToA Drop Rate Formula?

The OSRS ToA (Tombs of Amascut) drop rate formula calculates the cumulative probability of receiving a drop after multiple attempts. It follows the standard probability formula for independent events.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P \) — Cumulative drop probability
• \( p \) — Drop probability per single attempt (0 to 1)
• \( k \) — Number of attempts

Explanation: The formula calculates the probability of getting at least one drop after k attempts, assuming each attempt is independent with a fixed drop rate.

3. Importance of Drop Rate Calculation

Details: Understanding drop probabilities helps players estimate the number of attempts needed for rare items, plan their in-game activities, and set realistic expectations for reward acquisition.

4. Using the Calculator

Tips: Enter the drop probability per attempt (as a decimal between 0 and 1) and the number of attempts. Both values must be valid (p between 0-1, k ≥ 1).

5. Frequently Asked Questions (FAQ)

Q1: Does this formula account for bad luck mitigation?
A: No, this formula assumes independent attempts with fixed probability. OSRS generally doesn't have bad luck mitigation systems.

Q2: How accurate is this calculator for rare drops?
A: The formula is mathematically precise for independent events, but actual game mechanics may have slight variations.

Q3: Can I use this for other OSRS content?
A: Yes, this formula works for any content with fixed drop rates and independent attempts.

Q4: What's the probability of getting multiple drops?
A: This calculator shows the probability of getting at least one drop. For multiple drops, you'd need the binomial distribution formula.

Q5: How does team size affect drop rates?
A: In team activities, drop rates are typically divided among participants, which would require adjusting the p value accordingly.