Binomial Probability: 100 Coin Flips, Exactly 50 Heads
The probability of exactly 50 heads in 100 fair coin flips is approximately 7.96%.
How to use this tool
- Enter trials (n), successes (k) and probability of success (p) in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your p(x = k) and the full breakdown beneath it.
Find the exact probability of getting precisely 50 heads in 100 coin flips, a classic statistics problem.
Frequently asked questions
- What is the binomial distribution?
- The binomial distribution models the number of successes in n independent yes/no trials, each with the same probability p of success. Classic examples: coin flips, pass/fail tests.