Take a standardized IQ test from a licensed psychologist
Use a reputable, validated online IQ test as a rough estimate
Check that the test measures verbal, spatial, logical, and working memory skills
Follow the test instructions exactly
Take the test in a quiet place without distractions
Do not use calculators, notes, or outside help
Complete all sections within the time limits
Compare your score to the test’s norm group
Retake only if the test allows it and after a long enough gap
Use multiple tests if you want a broader estimate
Consider professional evaluation for the most accurate result