Every slot player has asked the question: “Is this game rigged?”
You play 1,000 spins on a slot with a declared 96% RTP, but your actual return is only 80%. Does this prove the casino is cheating? Mathematically, probably not. Slots are governed by Variance. High-volatility games require massive sample sizes to converge on their theoretical payout. Our RTP Confidence Calculator analyzes your session data to determine if your results fall within the “Normal Statistical Range” or if they are truly a mathematical anomaly.
Slot RTP Analyzer
Is it Rigged?How to Use the Calculator
This tool performs a statistical hypothesis test (Z-Test) on your gaming session. Here is how to verify your results:
- Enter Spins Played: Be accurate. A sample of 100 spins is statistically meaningless, while 10,000 spins provides decent data.
- Select Slot Volatility: This is the most critical step.
- Low (e.g., Starburst): Pays often but small amounts.
- Medium (e.g., Gonzo’s Quest): Balanced gameplay.
- High (e.g., Book of Dead): Rare wins but huge potential.
- Extreme (e.g., San Quentin): Dead spins for hours followed by a massive jackpot.
- Input RTP Data:
- Theoretical RTP: The number listed in the game’s info file (usually ~96.0%).
- Observed RTP: Your actual result. (Example: If you bet $100 total and got back $85, your observed RTP is 85%).
- Analyze the Verdict: The calculator will generate a “Confidence Interval.” If your result falls inside this range, the game is behaving normally.
Real-World Examples: The “Variance Illusion”
Why does “Bad Luck” feel like “Rigged Software”? These examples show how volatility distorts reality.
Example 1: The Panic (Low Sample Size)
You play 500 spins on a High Volatility slot. The RTP is 96%, but you only got 70% back.
- The Calculator Says: Normal Variance.
- Why: On a high variance game, 500 spins is nothing. The expected range for 500 spins might be anywhere from 40% to 150%. Your 70% is well within the mathematical margin of error.
Example 2: The Red Flag (High Sample Size)
You play 100,000 spins on a Low Volatility slot. Your result is 88% (Theoretical is 96%).
- The Calculator Says: Suspicious / Highly Unlikely.
- Why: Over such a massive sample size on a low volatility game, your results should be very close to 96%. A deviation of 8% here is statistically impossible (Z-Score > 3), suggesting the RTP setting might actually be lower than advertised.
Frequently Asked Questions (FAQ)
How many spins do I need to prove a slot is rigged?
You need millions. To distinguish between a 96% RTP and a 94% RTP with 95% confidence on a high-volatility slot, you often need over 1,000,000 spins. This is why it is difficult for individual players to “prove” a game is unfair based on personal experience.
What is “Standard Deviation” in slots?
Standard Deviation (SD) measures how far the results usually stray from the average. A Low Volatility slot has a low SD (results stick close to 96%). An Extreme Volatility slot has a massive SD (results swing wildly from 0% to 5000%), making short-term RTP meaningless.
Can casinos change the RTP while I am playing?
No. In regulated jurisdictions, the RTP is fixed in the game’s code. However, game providers often offer “RTP Ranges” (e.g., 96%, 94%, 92%). The casino must select one setting before the game goes live. They cannot switch it mid-spin based on your winning streak.