Probability Calculator

Coin flips, dice rolls, card draws, combinatorics, and Bayes' theorem.

Coin Flip

Flips Heads exactly

Sides Target number Rolls

Draw type Cards drawn

Favorable outcomes Total outcomes

P(A) P(B)

P(n, r) = n! / (n - r)!

n r

C(n, r) = n! / (r! * (n - r)!)

n r

P(A|B) = P(B|A) * P(A) / P(B)
P(B) = P(B|A)*P(A) + P(B|not A)*P(not A)

P(A) — Prior P(B|A) — Sensitivity P(B|not A) — False positive