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🎲

Probability Calculator

Calculate probability for single events, combined events (AND, OR), and complements. Helpful for math homework, statistics, decisions.

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🎯 Single Event Probability

Probability
16.67%
Decimal
0.1667
Odds
1:5
Complement
83.33%

🎲 Two Events Combined

P(A AND B)
25.00%
0.2500
P(A OR B)
75.00%
0.7500
◆ How it works

Probability Calculator3 simple steps

01

Single event

Favorable / Total outcomes

02

Two events

P(A and B), P(A or B)

03

See odds

Both ratio and percentage

◆ FAQ

Common questions.

P(A and B) formula?

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P(A or B) formula?

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Frequently Asked Questions

20 questions answered · Tap to expand

Questions in English

Open Toolzfy Probability Calculator, enter the required input values, and see the probability as fraction, decimal, percentage, and odds ratio with formula explanation instantly. No signup, no email, no installation required. Works in any browser on desktop, Android, iPhone, or tablet. Free forever with no hidden costs or daily limits.

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Frequently Asked Questions

Common questions about Probability

Use the tool interface to input your data, get instant results. Simple and intuitive design.