Professional Calculators
Complete suite of free calculators to optimize your sports betting and manage your bankroll like a professional
🏀 NBA First Quarter
Poisson + 10,000 Monte Carlo simulations with value detection
🎯 Event Probability
Goals, corners, cards probabilities using Poisson – free
⚖️ Arbitrage (Surebet)
Guaranteed profit opportunities comparing bookmakers – free
📊 ROI Calculator
Measure profitability of your bets in % – free
📈 Kelly Criterion
Optimal stake size based on bankroll and edge – free
🎯 Value Bet Calculator
Detect bets with positive Expected Value (EV) – free
🔄 Odds Converter
Decimal, fractional and American formats + implied probability
📉 CLV Calculator
Closing Line Value: long-term edge indicator – free
ROI Calculator
Calculate your Return on Investment (ROI) to know if your bets are profitable
0 of 3 free calculations used today
Today0/3💡 Tip: A consistent positive ROI of 5-10% already places you in the top 5% of bettors. Don't chase unrealistic 50%+ ROIs, consistency is key.
Kelly Criterion Calculator
Calculate the optimal bet size based on your bankroll and perceived edge
0 of 3 free calculations used today
Today0/3Your estimate of the real probability of the event occurring
Recommended: 25-50% to reduce volatility
💡 Tip: Use 1/4 Kelly (25%) to reduce volatility without sacrificing too much growth. Full Kelly can generate brutal swings in your bankroll.
Value Bet Calculator
Identify if a bet has real value by comparing odds with probability
0 of 3 free calculations used today
Today0/3Your estimate of the real probability based on analysis
💡 Tip: For a bet to be profitable long-term, you need to have consistently positive value. A single value bet doesn't guarantee profits, but 100 will.
Odds Converter
Convert between decimal, fractional, American and probability formats
0 of 3 free calculations used today
Today0/3💡 Tip: Decimal odds are the easiest to use for calculating returns and comparing value. Multiply your stake by the odds to know your total return.
CLV Calculator (Closing Line Value)
Measure your real edge by comparing the odds you bet vs the closing odds
Want to Track All Your Bets Automatically?
These calculators are useful, but imagine having all your bets recorded automatically with ROI analysis, EV and real-time strategy performance.
With BetStratify you can:
- ✓Record all your bets with one click and calculate ROI automatically
- ✓Analyze which strategies, leagues and markets give you the best performance
- ✓Manage your bankroll with automatic stop-loss alerts
- ✓Receive real-time value bet notifications
- ✓View evolution charts and advanced statistics
Join thousands of bettors already using BetStratify
How to Use the Betting Calculators
📊 ROI Calculator
Return on Investment (ROI) is the most important metric to know if your bets are profitable. Enter the total wagered and total returned to calculate your ROI percentage. A consistent positive ROI of 5-10% already places you in the top 5% of bettors.
📈 Kelly Criterion
The Kelly Criterion is a mathematical formula that calculates the optimal bet size based on your bankroll and perceived edge. It helps maximize long-term bankroll growth while minimizing risk of ruin. We recommend using 1/4 or 1/2 Kelly to reduce volatility.
🎯 Value Bet Calculator
A value bet occurs when your estimated probability of an event is higher than the implied probability in the odds. This calculator tells you if a bet has real value and what your Expected Value (EV) is in the long run.
🔄 Odds Converter
Convert between decimal (Europe), fractional (UK) and American (US) formats. It also calculates the implied probability of each odds to help you identify value more easily.
💡 Tips for Using the Calculators
- Be honest with your estimates: The calculators are only as good as the data you input. Don't overestimate your probabilities.
- Use conservative Kelly: 1/4 or 1/2 Kelly reduces volatility without sacrificing too much growth.
- Look for value, not high odds: A low odds bet with value is better than high odds without value.
- Track your results: Use these calculators before betting, but record all your bets to analyze your real performance.