Probability Calculator
Calculate probability of events quickly
Probability Result:
0.5
50%
Odds:
1 : 1
Formula Used:
P(A) = Favorable Outcomes / Total Outcomes
Interpretation:
There's a 50% chance of the event occurring
Probability Concepts
Basic Probability:
P(A) = Number of favorable outcomes / Total outcomes
Probability Rules:
Range:
0 ≤ P(A) ≤ 1
Complement:
P(A') = 1 - P(A)
Addition Rule:
P(A ∪ B) = P(A) + P(B) - P(A ∩ B)
Common Probabilities:
Coin Toss (Head):
P = 0.5 or 50%
Dice Roll (6):
P = 1/6 ≈ 16.67%
Drawing Ace from Deck:
P = 4/52 ≈ 7.69%
Rain Tomorrow:
P = 0.3 or 30% (example)
Probability Scale:
Impossible
0 Unlikely
0.25 Even Chance
0.5 Likely
0.75 Certain
1
0 Unlikely
0.25 Even Chance
0.5 Likely
0.75 Certain
1