--- title: "Coin Flip Probability Calculator | Probability Calculator | XTRAW Tools" description: "Calculate the probability of getting exactly k heads in n coin flips. Use this free browser-based probability calculator from XTRAW Tools." url: "https://xtraw.com/calculators/everyday-utilities/coin-flip-probability-calculator" date: "2026-05-20T21:55:57+00:00" language: "en-GB" --- [Speed Conversion Calculator](https://xtraw.com/calculators/everyday-utilities/speed-conversion-calculator)[Acres to Square Feet Calculator](https://xtraw.com/calculators/everyday-utilities/acres-to-square-feet-calculator) [![Coin Flip Probability Calculator from XTRAW Tools](https://xtraw.com/images/virtuemart/product/xtraw-coin-flip-probability-calculator-360x360.jpg)](https://xtraw.com/images/virtuemart/product/xtraw-coin-flip-probability-calculator-360x360.jpg "Coin Flip Probability Calculator from XTRAW Tools") new [Back to: Everyday Utilities](https://xtraw.com/calculators/everyday-utilities "Everyday Utilities") # Coin Flip Probability Calculator Calculate the probability of getting exactly k heads in n coin flips. Use this free browser-based coin flip probability calculator from XTRAW Tools. **Coin Flip Probability Calculator** helps you calculate the probability of getting exactly k heads in n coin flips. Use this free browser-based calculator from XTRAW Tools to compare inputs, estimate results, and plan your next step. ## How to Use the Coin Flip Probability Calculator 1. Enter the required calculator inputs shown in the form. 2. Review the probability, distribution, dataset, contingency table, correlation, regression, or diagnostic assumptions. 3. Run the calculator, then adjust one input at a time to compare scenarios or check your estimate. ## What This Calculator Helps With Calculate the probability of getting exactly k heads in n coin flips. It is designed for students, teachers, researchers, analysts, gamers, probability learners, science users, and anyone working with statistics who want a fast, browser-based estimate before relying on a spreadsheet, textbook, analytics platform, research software, professional source, or specialist. - Number of Flips (n): 10 - Number of Heads (k): 6 - P(Heads) — 0.5 for fair coin: 0.5 ## Common Uses People use this calculator when they need a quick way to estimate probability, compare statistical assumptions, review distribution values, or check a statistics formula. - **Math Solving:** Solve probability, statistics, distribution, regression, diagnostic, or classroom problems from entered values. - **Random Selection:** Explore dice, coin, card, and chance outcomes for education, games, and probability demonstrations. - **Measurement:** Measure sensitivity, specificity, predictive values, correlation, probabilities, distribution values, or model estimates. ## Formula or Method P(X=k) = C(n,k) × p^k × (1−p)^(n−k) ## Example **Example inputs:** Number of Flips (n): 10; Number of Heads (k): 6; P(Heads) — 0.5 for fair coin: 0.5 **Example result:** Using the default inputs, probability of exactly 6 heads in 10 flips is 20.51%. ## Related Tools - [Bayes' Theorem Calculator](https://xtraw.com/tools/bayes-theorem-calculator) - [Binomial Distribution Calculator](https://xtraw.com/tools/binomial-distribution-calculator) - [Normal Distribution Calculator](https://xtraw.com/tools/normal-distribution-calculator) - [Dice Probability Calculator](https://xtraw.com/tools/dice-probability-calculator) - [Card Probability Calculator](https://xtraw.com/tools/card-probability-calculator) ## Coin Flip Probability Calculator FAQ ### Is the Coin Flip Probability Calculator free? Yes. This calculator is free to use on XTRAW Tools. ### Do I need to create an account? No. XTRAW tools are designed for browser-based use without requiring an account. ### Are the results exact? Results may be estimates depending on the inputs, formula, rounding, statistical method, probability model, and purpose of the calculator. Always verify important results before relying on them. **Disclaimer:** This calculator is provided for general informational, educational, and convenience purposes only. It is not legal, financial, medical, gambling, academic, research, statistical consulting, safety, or professional advice. 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