Single Bet Converter
Implied Probability
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As posted
Fair Probability (no vig)
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Requires market context (see below)
Payout on $100
$—
Profit + stake returned
EV @ Your True %
$—
Based on your estimate
Tip: +2000 ≈ 100 / (2000 + 100) = 4.76% implied chance.
Market Vig Removal
Enter the odds for each outcome in a market to see the vig and the fair (no-vig) probabilities.
Enter market odds and click compute.
How the Math Works
American → Probability
Positive: P = 100 / (A + 100)
Negative: P = -A / (-A + 100)
Positive: P = 100 / (A + 100)
Negative: P = -A / (-A + 100)
Decimal → Probability
P = 1 / D
P = 1 / D
Fractional → Probability
For F = a/b, P = 1 / (a/b + 1)
For F = a/b, P = 1 / (a/b + 1)
Fair (No-Vig) Market
Convert each outcome to implied prob and normalize: p_i^fair = p_i / Σ p_i
Convert each outcome to implied prob and normalize: p_i^fair = p_i / Σ p_i
Expected Value (EV)
For stake S, payout R, true probability q:
EV = q * (R - S) - (1 - q) * S
For stake S, payout R, true probability q:
EV = q * (R - S) - (1 - q) * S
This tool is informational and not financial advice. Bet responsibly.