Coin Flipper: Virtual Heads or Tails
Flip a fair virtual coin for decisions, classroom activities, and probability experiments.
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Tags: coin flipper online, virtual coin toss, heads or tails tool
Coin Flipper: Virtual Heads or Tails Part of our complete guide to this topic — see the full series. A coin flip is the simplest form of random decision. One question, two outcomes, equal probability. The concept is so familiar that "flip a coin" has become shorthand for any binary decision requiring impartiality. A virtual coin flipper does the same job with one advantage: it's always available, never biased by worn edges or inconsistent technique, and leaves no room for physical sleight of hand. --- What is the physics of a physical coin? Physical coin flips are not perfectly fair. A 2007 study by Persi Diaconis, Susan Holmes, and Richard Montgomery found that a coin is more likely to land on the same side it started on when tossed. For a coin starting heads-up, heads occurs about 51%…
Frequently Asked Questions
How do I flip a coin online?
Open a coin flipper tool and click the flip button. The tool calls crypto.getRandomValues() to sample a random bit, then displays Heads or Tails. Each flip is independent — the result is not influenced by previous flips, browser state, or time of day.
Is a virtual coin fair?
A well-implemented virtual coin using crypto.getRandomValues() is provably fair: each of the two outcomes has exactly 50% probability on every flip, with no memory of past results. Physical coins have a documented 51/49 bias toward the side facing up when flipped — making a good virtual coin actually fairer than a physical one.
How many coin flips to win 10 in a row?
The probability of winning 10 flips in a row is (0.5)^10 = 1/1024 ≈ 0.098%. On average you'd need to attempt the sequence about 1,024 times (2,047 individual flips including failed starts) before succeeding. Each attempt is the same 0.098% probability regardless of how many times you've already failed.
What is the probability of 5 heads in a row?
P(5 heads in a row) = (0.5)^5 = 1/32 ≈ 3.125%. If you flip a coin 5 times and track whether all are heads, this event happens about 3 times in every 100 such experiments. The gambler's fallacy is believing that tails is 'due' after several heads — each flip remains 50/50 regardless of history.
How do I use a coin flip for group decisions?
For binary group decisions, flip once and honor the result. For larger groups, consider elimination rounds: split into pairs, each pair flips, winners advance. For N people, you need log₂(N) rounds to select one. Alternatively, use a list shuffler to randomly order all participants and pick the top entry.
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