Percentile Calculator — Find Any Percentile in Your Data
Enter your data set and a desired percentile to calculate the value at that position. Also shows Q1 (25th), Median (50th), and Q3 (75th) percentiles.
Common Percentiles
- P25 (Q1): 25th percentile — first quartile
- P50: 50th percentile — the median
- P75 (Q3): 75th percentile — third quartile
- P90: 90th percentile — used in performance benchmarks
- P99: 99th percentile — used in latency monitoring
Frequently Asked Questions
What is a percentile?
A percentile indicates the value below which a given percentage of observations fall. The 75th percentile (P75) means 75% of the data is below this value.
How do I calculate the 90th percentile?
Sort the data, then use: index = (90/100) × (n−1). If the index is not a whole number, interpolate between the two nearest values.
What is the difference between percentile and percentage?
Percentage is a fraction out of 100 (75% of 200 = 150). Percentile is a position in a ranked data set (75th percentile = scored higher than 75% of participants).
What percentiles are in the five number summary?
P0 (min), P25 (Q1), P50 (median), P75 (Q3), and P100 (max). These divide data into four equal quarters.
Related Calculators
- Median Calculator — the 50th percentile
- Five Number Summary — Min, Q1, Median, Q3, Max
- BMI Calculator (Metric) — BMI uses percentile charts for age-based child assessment
- All Statistics Calculators
Conversion factors verified against NIST, BIPM
Based on SI definitions (BIPM).
Last reviewed: March 2026
