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🧮 The Contest Lab · zero feeds · works forever

7 tools for the money math DFS sites hope you skip.

Rake, exposure, duplication risk, overlay — the numbers behind every entry fee. Start with the rake below.
Why this exists ▾
Every DFS site takes a cut before paying winners, and every lineup you build competes against your own other lineups whether you notice or not. These seven calculators are the math a sharp DFS player runs before clicking submit — free, offline, and yours to keep. Pure math, zero data feed, works identically for MLB, NBA, NFL and NHL.
💸 CONTEST RAKE CALCULATORknow your cut
Enter the contest details.
Rake = money collected minus money paid out. Lower rake means a smaller edge needed to profit long-term.
📒 DFS Profit Trackerrunning total
Net—
ROI—
🧾 Same math as The Receipt (clv.html) but sized for DFS entries instead of single bets.
🎯 Exposure Calculatorper player
Exposure—
🌡️ 20-35% is a common sweet spot for a strong-conviction play; 50%+ means one bad game hurts your whole night.
👥 Duplication Riskchalk check
Est. duplicate lineups—
🔁 Rough estimate: (own%⁄100)^chalk-players × field size. More chalk stacked together, more twins in the field splitting your prize.
💰 Overlay Calculatorfree money check
Overlay—
🚨 Positive overlay = the site is paying out more than it's collected. Free +EV, if it stays that way at lock.
🔄 Swap EV Calculatorworth the change?
Value swing—
⚖️ Compares points-per-$1K between the two — positive means B is the better value at these salaries.
🧬 Correlation Calculatorstack strength
Stack correlation—
🪢 Same-game stacks correlate — both hit big when the game goes the way you expect. Uncorrelated players just add variance without the payoff.
What each tool is for ▾
  • 💸 Rake: shows exactly what the site keeps vs. what's actually in play for winners.
  • 📒 Profit Tracker: your running DFS record — net and ROI, same shape as a betting ledger.
  • 🎯 Exposure: the % of your total entries riding on one player — too high and one flop wrecks your night.
  • 👥 Duplication Risk: how many other lineups in the field probably look just like yours.
  • 💰 Overlay: is this guaranteed contest paying out more than it collected? That's free equity.
  • 🔄 Swap EV: is benching Player A for Player B actually a value upgrade at these salaries?
  • 🧬 Correlation: same-game stacks move together — this scores how much that helps your ceiling.
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