Fast, free calculators for prediction markets and betting lines — no signup, no fluff. The same math Scout runs on thousands of markets every day.
Strip the house margin from any two-way market and see the fair, no-vig probability of each side.
Open →Convert American, decimal, and implied-probability odds instantly — type any format, get the other two.
Open →Enter a price and your true probability to see the EV per dollar, your edge, and whether it's +EV.
Open →Size a bet the disciplined way — full and fractional Kelly from your edge and the odds.
Open →Add any number of legs to get the combined odds, total payout, and the real chance your parlay hits.
Open →Two books disagree? See if there's a guaranteed-profit arb, how to split your stake, and the ROI.
Open →KalEdge's AI finds the edges these tools help you check — and sends you the short list. Free to start.