Free tools
The betting math, in the open.
Seven free tools that run the same odds math as the board. No login, no card.
Interactive tools
Grade My Bet
Paste any prop and get a 0-100 score against the live market, the books pricing that exact line.
Open the toolLine Movement Checker
Did the line move your way? Look it up against the last price the scanner archived.
Open the toolNo-Vig Calculator
Strip the vig from any two-way price: four de-vig methods, side by side.
Open the toolOdds Converter
American, decimal, and implied probability: live two-way conversion.
Open the toolKelly Calculator
Turn a win probability, odds, and bankroll into a suggested stake.
Open the toolHedge Calculator
How much to bet the other side, and what you keep either way.
Open the toolParlay Calculator
Each leg's odds in, the parlay odds and payout out. Add the other sides to see what the book keeps.
Open the toolConcept guides
The ideas behind the tools: plain-English explainers, no calculator required.
Positive EV
What +EV means, in plain English.
Arbitrage
Two-sided price gaps and why they're rarer than ads claim.
Middles
Betting both sides of a moved line for a window where both win.
Parlays
How legs compound: the math the slip doesn't show you.
The receipts
The same math, graded in public against real outcomes.
Common questions.
- Are these tools really free?
- Yes. No account, no card, no trial clock. The calculators run entirely in your browser; the bet grader and the line movement checker are rate-limited so they stay free for everyone.
- Is this the same math as the paid product?
- Yes. The odds math, the vig removal and the Kelly sizing are the same math the board runs. The paid board adds the live picks: which book, which price, right now.
- Do the tools tell me what to bet?
- No. They tell you what the market implies and what the math says about a price. That's information, not betting advice. No probability makes a bet a sure thing.
Want the math run for you?
The tools are manual. The board runs the same math on every market, all day, and shows what clears the bar.