# Percentile Calculator Calculate one or more percentiles for a numeric dataset with linear, nearest-rank, or exclusive methods > Canonical page: https://elysiatools.com/en/tools/percentile-calculator - **Category:** Math & Numbers - **Keywords:** percentile, quantile, statistics, p90, p95, distribution, dataset ## Overview Calculate percentile values for a numeric dataset. Percentiles show the value below which a given percentage of observations fall. For example, the 90th percentile is the value at or below 90% of the sorted data. Use this tool for score analysis, service-level metrics, latency percentiles, quality-control thresholds, and distribution summaries. ## Inputs - **Dataset** (textarea): e.g. 12, 18, 21, 25, 29, 34, 40, 50 - **Percentiles** (text): e.g. 25, 50, 75, 90, 95 - **Calculation Method** (select) - **Decimal Places** (number) - **Include Summary Statistics** (checkbox) ## When to use - Analyzing system latency and performance metrics to ensure service-level agreements (SLAs) are met. - Evaluating test scores or grading curves to determine relative student performance. - Summarizing financial or demographic data distributions to identify median and quartile thresholds. ## How it works - Paste your numeric dataset into the input field, separating values with commas, spaces, or newlines. - Specify the exact percentiles you want to calculate, such as 25, 50, 75, 90, or 95. - Choose your preferred calculation method (linear interpolation, nearest rank, or exclusive) and set the desired decimal precision. - View the calculated percentile values instantly, along with optional summary statistics like mean and median. ## Use cases - Software engineers calculating P95 and P99 API response times to monitor service-level agreements (SLAs). - Teachers and educators determining grading curves and identifying top-performing students based on test scores. - Data analysts calculating quartiles (25th, 50th, 75th percentiles) to create box plots and summarize data distributions. ## Frequently asked questions ### What is a percentile? A percentile is a statistical measure indicating the value below which a given percentage of observations in a group falls. For example, the 90th percentile is the value at or below which 90% of the data lies. ### What is the difference between the calculation methods? Linear interpolation estimates values between data points, nearest-rank picks the closest actual data point, and the exclusive method excludes the endpoints (0 and 100) from the calculation, which is often used in specific statistical software. ### Can I calculate multiple percentiles at once? Yes, you can enter a comma-separated list of percentiles (like 25, 50, 75, 90, 99) to calculate all of them simultaneously. ### What are P50, P90, and P99? These are common shorthand terms for the 50th (median), 90th, and 99th percentiles. They are frequently used in engineering to measure system latency and performance. ### Does the tool sort the data automatically? Yes, the calculator automatically sorts your raw dataset in ascending order before computing the requested percentiles. ## Related tools - [Bayes Theorem Calculator](https://elysiatools.com/en/tools/bayes-theorem-calculator): Calculate posterior probability P(A given B) using prior, likelihood, and false-positive rate - [Belt Pulley Speed Ratio Calculator](https://elysiatools.com/en/tools/belt-pulley-speed-ratio): Calculate the ratio, driven speed and belt linear speed of a belt drive. i = d₂/d₁ = n₁/n₂, belt speed v = π·d·n/60. 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