Standard Score (Hensachi) Calculator

Hensachi is calculated as 50+10×(score−mean)÷standard deviation. A score at the mean becomes 50, one standard deviation above becomes 60, and one below becomes 40. It compares position within the group that took that test, so the same raw score can produce different results when the mean or spread changes.

Estimated mode shows a range using standard deviations of 15 and 20 because an exact result is impossible without the actual spread. That range is illustrative, not an official score. Testing organizations may apply subject or population adjustments and rounding, so their report can differ from this simple formula. Hensachi also does not compare ability absolutely across unrelated exams. Use the result to set direction, then turn specific errors into review tasks.