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Free Sports Betting Calculators

The four calculations a disciplined bettor actually uses — fair odds, bet sizing, closing line value, and parlay EV. Free, no account, nothing leaves your browser. The same math we grade every pick against.

No-Vig / Fair Odds →
Strip the sportsbook's vig from any two-way market to see the fair odds and true probability. Start here — it feeds everything else.
Kelly Stake →
Bankroll + odds + win probability → the optimal stake, plus the safer half and quarter-Kelly versions sharp bettors actually use.
Closing Line Value →
Your bet odds vs the close → did you beat it? The single best proof your bets are good, far more reliable than whether they won.
Parlay + EV Check →
Combined odds and payout for any parlay — and a true expected-value check that shows how the vig compounds with each leg.
Grade My Bet →
Paste a bet you made and where the line closed → a plain verdict (Sharp / Fair / Questionable) from CLV and EV. Grade the decision, not the luck.
Why these are free The big scanners gate this math behind $99–$199/month subscriptions. We don't — because the calculators aren't the product. A transparent model and a public, graded track record are. Learn the math here for free; if you want the model's daily read, that's the open audit.

How they fit together

They're a chain. De-vig a sharp book's price to get the fair probability. Compare it to what you can actually bet elsewhere — the gap is your edge (+EV). Size the bet with Kelly. After it settles, check your CLV to confirm the edge was real. And before you ever touch a parlay, run the EV check — the vig compounds fast.

FAQ

Are these free?

Yes — free, no signup, and they run entirely in your browser. Nothing you type is sent anywhere.

Which one matters most?

De-vigging. The fair price underpins your edge, your Kelly stake, and your CLV. Learn that one first.

See the math applied, live and graded
We de-vig every line, size with fractional Kelly, and grade every pick against the close — in the open.
Open the audit
Keep reading
What is +EV (value) betting? → Closing line value explained → The Kelly criterion, in full → Why parlays lose (the data) →
These tools are educational and are not betting advice. Sports betting carries real financial risk. Bet responsibly and only with money you can afford to lose. If gambling is causing harm, visit ncpgambling.org or call 1-800-GAMBLER.