IQ Percentile Calculator

IQ percentile calculator helps users convert an IQ score into percentile rank using a normal distribution model centered at 100. It is useful for people who want to understand how a score compares with the broader population rather than just seeing the raw IQ number. Users enter an IQ score and choose the standard deviation that matches the test scale, such as 15 or 16, then view percentile, percentage above, and percentage below.

Normal distribution model (μ = 100, σ = 15 or 16)

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🧠 IQ score Mean (μ) fixed at 100

Tip: You can type decimals too (e.g., 115.5).

📊 Standard deviation (σ) Wechsler/SB5: 15 • Older Stanford–Binet: 16

σ = 15 σ = 16

Choose the standard deviation that matches your test’s scoring scale.

Results

Percentile

— %

% above your IQ

— %

% below your IQ

— %

Add your IQ score (and choose σ = 15 or 16) to see how you rank.

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