CS2 Case
House Edge
Calculator
Find out if your CS2 case opening site is fair — or taking you for a ride. Enter drop rates and prices to instantly reveal the real house edge.
The Calculator
Enter the case price and every item's drop rate + market value. Rates must sum to 100%.
House Edge % = ((Case Price − Expected Value) / Case Price) × 100
What is House Edge?
The math built into every case opening
What is House Edge?
House edge is the percentage of every dollar wagered that the site keeps as profit. A 10% house edge means for every $1.00 spent opening cases, you get back $0.90 in value on average.
How is it Calculated?
Multiply each item's drop rate by its market price, sum them all for Expected Value. Subtract EV from case cost, divide by case cost, multiply by 100. Our calculator handles this instantly.
What's a Fair Edge?
Below 7.5% is excellent for CS2. 7.5–11.6% is the industry norm. Above 11.6% is predatory. Valve's official CS2 cases run at ~85% house edge — third-party sites are significantly better.
Outcome Probability Simulator
See how lucky, average, and unlucky runs diverge over time. Auto-fills from the calculator above.
Simulates 500 independent runs and plots the 90th percentile (lucky), 50th percentile (average), and 10th percentile (unlucky) cumulative P/L at each open. The dashed line shows the mathematically expected outcome based on house edge alone.
Frequently Asked Questions
Everything you need to know about house edge