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60 articlesThe math behind better decisions — across sportsbooks and prediction markets.
Sportsbook vs Prediction Market Arbitrage: How to Find and Execute Cross-Platform Arbs
Sportsbook vs prediction market arbitrage delivers 4-8% risk-free returns. 3 worked examples with de-vig math, fee-adjusted calculations, and 4 execution rules.
De-Vig Calculator: How to Strip the Margin From Any Betting Line
De-vig calculator removes sportsbook margin in 3 steps. 7 methods compared with worked examples, plus when each one gives you the most accurate true odds.
Line Movement: How to Read, Interpret, and Profit From Shifting Odds
Line movement explained with 4 worked examples showing how odds shifts change the math. Learn to read sharp money, steam moves, and closing line value signals.
Implied Probability Calculator: 3 Formulas to Convert Any Odds Format
Convert American, decimal, and fractional odds to implied probability with 3 simple formulas. Works for any betting market or sportsbook.
True Probability Calculator: How to Strip the Vig and Find Real Odds
True probability calculator removes sportsbook vig in 3 steps. 7 de-vig methods, worked examples, and when each method matters most.
Bankroll Calculator: How to Set Your Starting Bankroll and Unit Size
Bankroll calculator guide with 3 methods for setting your starting bankroll. Includes risk tolerance math, unit sizing formulas, and 4 worked examples.
Sports Betting ROI Calculator: How to Track Your Real Return
3 ROI formulas separate profitable bettors from break-even ones. Learn to calculate, track, and improve your sports betting return on investment.
How to Trade on Robinhood Prediction Markets: A Step-by-Step Guide
How to trade prediction markets on Robinhood in 5 steps, with fee math, order types, and 2 worked examples showing real contract costs.
Betting Edge Calculator: How to Find and Measure Your Real Edge
Betting edge calculator guide with 3 methods to measure your real edge. Learn how to separate skill from luck using sample size, CLV, and closing line analysis.
Polymarket Fees Explained: Per-Category Trading Fees (March 2026)
Polymarket now charges per-category trading fees with rates from 0% (geopolitical) to 1.80% (crypto). Full fee table, formula breakdown, and worked examples for every category.
Half Point Calculator: When Buying Points Is Worth the Price
Half point calculator shows when buying points has +EV. 5 key numbers, worked math, and the 3-to-7 rule that separates sharp line moves from sucker bets.
Round Robin Calculator: When Parlays in Disguise Pay Better
Round robin calculator breaks 4+ legs into every parlay combo. 3 formulas show when round robins beat straight parlays by reducing variance.
Teaser Calculator: When Buying Points Actually Has +EV
Teaser calculator math reveals when buying points is +EV. 3 formulas, break-even analysis, and the 3/7 rule that separates sharp teasers from sucker bets.
Middle Bet Explained: How to Win Both Sides of a Wager
Middle bets profit when the result lands between 2 lines. 3 worked examples with exact math, expected value formulas, and when middling is worth the risk.
Odds Boost Calculator: How to Find the True EV of Any Profit Boost
Odds boost calculator math: 3 methods to calculate the real EV of boosted odds. Most promos are worth $2-15. Some are worth $50+.
Free Bet Calculator: How to Convert Free Bets Into Guaranteed Profit
Free bet calculator math for converting bonus bets at 70-80% rates. Learn the SNR conversion formula, 2 worked examples, and 5 mistakes that destroy your edge.
Prediction Market Fees Comparison: 8 Platforms Ranked by What You Actually Pay
Compare prediction market fees across all 8 platforms with worked examples showing the real cost per $100 trade. Find the lowest-fee platform for your strategy.
Live Arbitrage Betting: 4 In-Play Strategies That Lock in Profit
Live arbitrage betting explained with 4 strategies and real numbers. In-play odds move fast enough to create 2-5% guaranteed profit windows.
Prediction Market Live Trading: 4 Real-Time Strategies That Work
Prediction market live trading in 4 strategies: news scalping, spread capture, momentum exits, and hedging. Includes 3 worked examples with fee math.
Prediction Market Taxes 2026: IRS Rules for Kalshi, Polymarket & Robinhood
How are prediction markets taxed in 2026? 3 IRS classifications, Section 1256 vs capital gains vs gambling, 1099 reporting by platform, and the new 90% loss deduction cap.
Prediction Markets vs Polls: Which Forecasts the Future Better?
Prediction markets vs polls compared across 6 elections, 2 accuracy metrics, and the math that explains why markets beat surveys 71% of the time.
Cross-Platform Arbitrage: Sportsbook vs Prediction Market
Cross-platform arbitrage locks in 5-10% risk-free returns when sportsbooks and prediction markets disagree on price. 3 worked examples with fee-adjusted math.
Prediction Market No-Vig Advantage: Why Explicit Fees Beat Hidden Margins
Prediction market fees cost 40-60% less than sportsbook vig at most price points. 4 worked examples show exactly where the savings hide.
Prediction Market Mistakes: 8 Errors That Destroy Your Edge
Prediction market mistakes cost beginners 15-40% of expected value. Learn 8 common errors with worked examples and the math to fix each one.
Best Prediction Market in 2026: 8 Platforms Compared by the Numbers
8 prediction market platforms compared on fees, liquidity, and access. Find which platform costs less for your specific trading style in 2026.
Cross-Platform Edge: 4 Strategies That Exploit Pricing Gaps
Cross-platform edge strategies deliver 3-10% returns by exploiting pricing gaps between sportsbooks and prediction markets. 4 methods with worked math.
Kalshi vs Polymarket: 7 Differences That Affect Your Edge
Kalshi vs Polymarket compared across 7 dimensions: fees, liquidity, contract types, and regulation. See which platform costs less for your trading style.
Novig Prediction Market: $75M Raise Values Sports Exchange at $500M
Novig raised $75M at a $500M valuation from Pantera Capital. 3 things traders need to know about the P2P sports prediction market seeking CFTC approval.
Are Prediction Markets Gambling? The Math Says It Depends on You
Are prediction markets gambling? 91% of traders lose money, but so do 80% of options traders. The 3 structural tests that separate gambling from trading.
What Does Over/Under Mean? The Math Behind Totals Betting
What does over under mean in betting? Learn how totals work with 3 worked examples, vig math, and the half-point hook that costs bettors 4.5% edge.
Point Spread Explained: How to Read, Calculate, and Beat the Number
Point spread explained with 4 worked examples and the math behind every spread bet. Learn how spreads set prices and where the edge hides.
Event Contract vs Options: 7 Differences That Change the Math
Event contract vs options compared across 7 dimensions: pricing, risk, fees, Greeks, and more. Includes worked examples with break-even math for both instruments.
FanDuel Prediction Markets: 4 Reasons the 50-State Access Changes the Math
FanDuel prediction markets work in all 50 states. 4 worked examples show when the convenience justifies the cost and when cheaper platforms win.
DraftKings Prediction Markets: 5 Fee Traps and How to Avoid Them
DraftKings prediction markets charge $0.04 per round-trip. 5 worked examples show when the fees make sense and when they destroy your edge.
Coinbase Prediction Market Fees: What You Actually Pay Per Trade
Coinbase prediction market fees start at $0.02 per contract but can eat 10% of thin margins. 3 worked examples show the real cost of trading through Coinbase.
Prediction Market Position Sizing: How to Size Every Contract
Prediction market position sizing determines 80% of your P&L. Learn fee-adjusted Kelly, correlation discounts, and liquidity limits with 5 worked examples.
Event Contract Tax Treatment: 3 Classifications
Event contract tax treatment varies across 3 IRS classifications. Learn how Section 1256, capital gains, and gambling rules affect your prediction market taxes.
How Does Moneyline Work? The Math Behind Every Straight Bet
How does moneyline work? 5 worked examples break down the math behind plus and minus odds, implied probability, and finding value in straight bets.
Prediction Market Bankroll Management: How to Size Positions and Survive
Prediction market bankroll management requires different math than sports betting. 5 worked examples cover Kelly sizing, capital lockup, and why 91% of traders lose.
How to Trade on Robinhood Prediction Markets: Step-by-Step Guide (2026)
How to trade prediction markets on Robinhood — step-by-step setup, fee breakdown, tax treatment, and how to evaluate event contracts before your first trade.
How to Read Odds: 3 Formats, 1 Skill That Changes Everything
How to read odds in 3 formats with 7 worked examples. American, decimal, and fractional odds explained so you never misread a line again.
How to Trade Event Contracts: A Step-by-Step Guide
How to trade event contracts in 5 steps: buy, sell, and calculate profit on binary contracts priced 0-100 cents. Includes 3 worked examples with fee math.
Odds Converter: How to Convert Between American, Decimal & Fractional Odds
Free odds converter with formulas to convert between American, decimal, fractional odds, and implied probability. 6 worked examples, a reference table, and an instant converter tool.
Kalshi 1099: Tax Reporting for Event Contracts
Kalshi 1099-B tax reporting explained with 60/40 Section 1256 treatment, 2 worked examples, and 2026 deadlines for event contract traders.
Correlated Positions: How Linked Bets Amplify Risk
Correlated positions can triple your actual risk exposure. Learn the 4-step portfolio audit process with worked examples and position sizing adjustments.
Multi-Outcome Markets: Finding Mispriced Contracts
Multi-outcome markets misprice 5-15% of contracts due to overround and longshot bias. Learn 3 de-vig methods to identify and exploit these inefficiencies.
Polymarket Tax Reporting: What Traders Owe
Polymarket tax reporting requires self-tracking every trade. Learn the 3 possible tax classifications, how to calculate gains, and what records to keep.
Prediction Market Strategy: 5 Quantitative Edges
Prediction market strategy built on 5 quantitative methods. EV-based contract selection, fee-adjusted sizing across 8 platforms, and 2 worked trade evaluations.
Prediction Market vs Sportsbook: 6 Key Differences
Prediction market vs sportsbook comparison across 6 dimensions: fees, odds, liquidity, markets, exits, and edge. Includes worked cost examples for each.
How Prediction Markets Work: A Complete Guide
How prediction markets work in 6 steps: pricing, trading, fees, platforms, and finding edge. Includes 4 worked examples with real contract math.
Polymarket Substack Partnership: Live Odds Meet Independent Media
Polymarket's exclusive Substack partnership lets 3M+ authors embed live prediction market data. What the deal means for liquidity, pricing, and traders.
Prediction Market Fees Explained: The Real Cost of Every Trade
Prediction market fees reduce your edge by 30-60% on typical trades. Compare Kalshi and Polymarket fee structures with 5 worked examples and break-even math.
Odds Formats Explained: American, Decimal, Fractional
Odds formats explained with 3 conversion formulas and worked examples. Learn how American, Decimal, and Fractional odds hide or reveal the true price.
Bankroll Turnover: Why Bet Volume Beats a Big Edge
Bankroll turnover multiplies small edges into real profit. See the 3-step compounding formula, worked examples, and why 200 bets at 1% edge beat 5 bets at 10%.
Closing Line Value Explained: The True Measure of Betting Skill
Closing line value explained in 4 steps with worked examples. CLV is the single best predictor of long-term profit, and most bettors ignore it entirely.
Kelly Criterion Explained: Optimal Bet Sizing
Kelly criterion explained with 4 worked examples. Learn the Kelly formula, why half Kelly beats full Kelly in practice, and how to size every +EV bet.
Parlay Math: How Compounding Vig Destroys Your Edge
Parlay math broken down with 5 worked examples. A 3-leg parlay at standard juice carries 15% vig, not 4.5%. Here is exactly how the compounding works.
Sports Betting Math: Every Formula You Actually Need
5 core formulas separate winning bettors from losing ones. Learn EV, vig, Kelly sizing, CLV, and bankroll turnover with worked examples.
What Is Vig in Betting? How to Calculate Vigorish & Find True Odds
What is vig in betting? Learn how to calculate vig with 3 methods, see how hold varies across 4 market types, and strip it from any line with our free de-vig calculator.
How to Calculate Expected Value (EV) in Betting: Formula, Examples & Free Calculator
How to calculate expected value in sports betting. The EV formula explained with 3 worked examples, a free EV calculator, and the complete pipeline from vig removal to bet sizing.