Free odds from probability calculator to calculate odds from probability. Instant results in your browser — no signup.
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Enter values and calculate an instant answer.
Enter the values, then calculate.
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Primary answer and useful breakdowns.
Decimal odds
4.00
Odds for : against
1 : 3.00
American (approx.)
300
Percent
25.00%
Free odds from probability calculator to calculate odds from probability. Instant results in your browser — no signup. Decimal odds = 1/p. Odds against = (1−p)/p.
Decimal odds = 1/p. Odds against = (1−p)/p.
p = 0.25 → decimal odds 4.00 (3 to 1 against).
Implied p = 1 / decimal odds (ignoring vig).