IQ Percentile Calculator

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

Live

🧠 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.

Percentile

— %

% above your IQ

— %

% below your IQ

— %

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

Step-by-step derivation

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