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🧪 The Bet Lab · every number, vig included

Eight instruments. Zero guesswork.

The math the books use, turned around and pointed back at them — lock detection, fair prices, stake sizing and edge measurement. Works for every league, every season, every book.
⚾ MLB🏀 NBA🏈 NFL🏒 NHLANY BOOK
🟢 LOCK CHECKER — can these two prices guarantee money?VIG INC.
Opposite sides of the same line, two different books.
Enter both prices.
Plus-money on both sides is where locks live — the Middle Finder hunts them automatically.
Odds Converter3-way live
Type in any box — the other two follow. Implied % includes the book's vig.
No-Vig Fair Pricetwo-way
Fair A / Fair B—
Book hold—
Fair prices are what the market believes with the margin stripped out — the line your bet has to beat.
Expected Valueper $100
EV per $100—
If your probability is right, this is your long-run profit or loss per $100 staked.
Kelly Stakegrowth-optimal
Stake—
Kelly only bets when you have an edge — no edge, no bet.
Break-Even %the bar to clear
Win % needed—
Win more often than this and the bet prints long-term. Win less and it bleeds.
Quick Parlayup to 5 legs
Combined—
$100 pays—
Full builder with live legs: the Parlay room →
ROIrecord → return
ROI—
Flat $100 stakes assumed. A winning record can still lose money at bad prices.
Hedge Calculatorits own room
Already holding a ticket that's live to cash? The hedge room sizes the exit — lock a profit or cap the loss.
Open the Hedge Calculator →
What this tool does — and why it matters ▾

Eight instruments that turn the book’s own math around: lock detection, fair prices, stake sizing and edge measurement — the numbers behind every sharp decision, with the vig included in all of them.

  • Lock Checker (the hero). Two prices from two books — instant verdict on whether they guarantee money, with exact stakes per book and the locked profit per $100.
  • No-Vig Fair Price. The market’s true number with the margin stripped — the bar every bet must clear before it has value.
  • Kelly Stake. Growth-optimal sizing from your edge, with half and quarter throttles — and the discipline to say “no edge, no bet.”
  • EV, Break-Even, ROI. What a price is really worth at your win rate, the win % a price demands, and what your record actually earned.
  • Converter & Quick Parlay. American ↔ decimal ↔ implied in one live box, and combined odds for up to five legs.
  • Works offline, every league, forever. No feeds, no accounts — the math runs on your phone and never goes stale.
⭐ Unlock the whole house — $9.99/mo
Every tool, every board, unlimited. Plus the 2026 Fantasy Football Draft Guide free and early access to new tools. Founder pricing for early members.
Sign Up · $9.99/mo →