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Percentile Calculator

Find the k-th percentile of any data set.

Best for: Use it for exam rankings, salary bands, growth charts, or service-level (p95/p99) metrics.

Complete guide
Why this result happened View assumptions

Input

How it's calculated & sources
The Percentile Calculator uses the standard, deterministic formula, so the same inputs always produce the same result. It runs entirely in your browser, so your inputs are never uploaded. Last reviewed June 2026.
Key assumptions
  • Interpolation method as implemented

Free & no sign-up · runs entirely in your browser. Results are estimates for general information, not professional advice — verify important decisions with a qualified expert. Last reviewed June 2026.

How it works

Sort the data. The k-th percentile is the value at position k/100 × (n−1) using linear interpolation.

Example

1,2,3,4,5,6,7,8,9,10 — 50th percentile = 5.5

Frequently asked questions

Quartile vs percentile?+

Quartiles are the 25th, 50th and 75th percentiles.

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Complete guide

Quick answers

Short, sourced answers to the questions people (and AI assistants) ask most.

What is Percentile?
A percentile calculator finds the value below which a given percentage of the data falls.
Why does Percentile matter?
The cut-off value. The 90th percentile means 90% of the data is at or below it - common in test scores, growth charts and response times.
How is Percentile calculated?
It sorts the data and locates the position corresponding to the percentile, interpolating between values when needed. Formula: Rank position for the p-th percentile = (p / 100) x (n - 1) + 1, then interpolate between the surrounding values.
What are common percentile mistakes?
Confusing a percentile (a value) with a percentage (a proportion).
When should you use the Percentile Calculator?
Use it for exam rankings, salary bands, growth charts, or service-level (p95/p99) metrics.

What is the Percentile Calculator?

A percentile calculator finds the value below which a given percentage of the data falls.

How the Percentile Calculator works

It sorts the data and locates the position corresponding to the percentile, interpolating between values when needed.

Rank position for the p-th percentile = (p / 100) x (n - 1) + 1, then interpolate between the surrounding values

What impacts results most

  1. 1.
    Data set (High impact)Defines the distribution.
  2. 2.
    Percentile / value (High impact)What you are looking up.

Key assumptions

  • Interpolation method as implemented

Z-score to percentile (standard normal distribution)

-30.13%99.87%
-2.580.49%99.51%
-1.962.50%97.50%
-1.655.00%95.00%
-115.87%84.13%
-0.530.85%69.15%
050.00%50.00%
0.569.15%30.85%
184.13%15.87%
1.2889.97%10.03%
1.6595.00%5.00%
1.9697.50%2.50%
2.5899.51%0.49%
399.87%0.13%

Common mistakes to avoid

  • Confusing a percentile (a value) with a percentage (a proportion).
  • Using different percentile methods and comparing them.
  • Too little data to define high percentiles meaningfully.

Keywords: percentile, quartile.

Sources: NIST/SEMATECH e-Handbook of Statistical Methods

Reviewed by the Free Tools Galaxy editorial team · Updated June 2026 · Calculated privately in your browser.

Frequently asked questions

Is the Percentile Calculator free to use?+

Yes. Every tool on Free Tools Galaxy is 100% free, runs in your browser and requires no signup.

How accurate is the Percentile Calculator?+

Percentile Calculator uses the standard percentile formula in double-precision arithmetic, so the same inputs always produce the same result and you can verify any figure by hand. It is an educational estimate — real-world outcomes depend on your actual rates, rules and assumptions.

Do you store my inputs?+

No. The Percentile Calculator runs entirely in your browser. Nothing is uploaded or saved to a server.

Can I use the Percentile Calculator on mobile?+

Yes — the interface is fully responsive and works on phones, tablets and desktops.

What are common mistakes to avoid?+

The most frequent mistake is mixing units. Double-check your inputs use a single, consistent unit before clicking Calculate.

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# Percentile Calculator — the free tool I keep coming back to

Find the k-th percentile of any data set.

Try it: https://freetoolsgalaxy.com/tools/percentile-calculator
Quora answer
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