Seventeen tools that do the sportsbook math for you — and keep your record honest. Everything runs locally in your browser — no data leaves your device. -110 = 1.91 = 10/11 = 52.38%, every time.
Try “hedge”, “kelly” or “parlay” — or clear the search to see all 17 tools.
Enter odds in any format — get all three plus the implied probability.
What win chance is the market actually assigning at this price?
Stake in — profit and total return out.
Add each leg's odds — see the true combined price before you lock it in.
Build every smaller parlay from your legs automatically — pick your "by 2s", "by 3s", and see the cost of one leg losing. Glossary has the plain-English version.
Size your bet to your edge. Be honest about your win probability — Kelly punishes optimism.
The one number sharps actually bet on. Enter your estimated win probability — from your model, or from the odds board's no-vig fair line — and the best price you can get. Dollars of expected profit per bet, your edge, and the verdict: does the price beat break-even?
Enter both sides of a two-way market — see the book's hold and the true no-vig price.
Holding a ticket and want to lock profit — or think two books have left an arb on the table? Enter both sides' prices and find out.
One leg left on a live ticket? Enter your original stake, what the ticket pays in full (stake included), and the price on the other side of the remaining leg — then lock equal profit, free-roll, or size your own plan.
The line moved after your first bet — now you hold both sides at different numbers. Enter both bets and see exactly what a middle pays, and what a split costs. The labels are just for you; the math only needs stakes and prices. Read the line-movement guide first if you haven't.
Books hand out bonus bets, deposit matches and profit boosts — but a $100 bonus is never worth $100. Pick the promo type and price the offer like a sharp: what it converts to in real cash, after the fine print. Hedging a bonus bet? Shop both legs on the odds board first.
The book flashes a cash-out number mid-game — is it a fair price, or is the book pocketing the difference? Enter your original bet, the current price on the same side (check the odds board for the best one), and the book's offer. Fair value, the book's cut, and the verdict — plus what hedging the other side yourself would lock in.
Backing several outcomes where only one can win — a few golfers, a couple of division winners? Split your stake so the payout is identical whichever one lands. Name each selection (optional) and enter its price.
Monte Carlo: run thousands of simulated seasons at your win rate and price to see how a bankroll actually behaves — the losing streaks included. This is a model, not a prediction.
Log every bet and settle the results — your true record, net profit, ROI, win rate, streaks and per-sport numbers on one dashboard. Stored only in this browser, with CSV export.
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