Consecutive Coin Flip Probability Guide
The Consecutive Coin Flip Probability Calculator finds the chance of getting the same outcome n times in a row when flipping a coin. It supports two modes — a specific side (heads or tails) n times consecutively, or any matching side n times consecutively — and works with biased coins where heads probability is not 50%.
For a fair coin, a specific side n times in a row has probability (1/2)^n, and any matching side has probability (1/2)^(n-1). For example, 10 heads in a row occurs with probability 1/1024 ≈ 0.098%, or about once every 1,024 attempts.
Each flip is independent, so a streak of past results never alters the next flip's odds (the gambler's fallacy). Use this tool for probability learning, betting decisions, and game design analysis.
Frequently Asked Questions
P = (1/2)^n. For n=10, that is 1/1024 ≈ 0.098%.
2 × (1/2)^n = (1/2)^(n-1).
No — each flip is independent (gambler's fallacy). The 10th flip remains 50/50.