How the IQtonics IQ test works
Last reviewed: October 15, 2026
This page explains how the IQtonics IQ test is built, how your score is calculated and what the result can and cannot tell you. We update it whenever the questions or the scoring change.
What the test measures
The main IQ test has 40 questions and a 20-minute time limit. The questions cover five areas of reasoning and get harder as you go, from difficulty level 1 up to level 9 on a 10-level scale. You see one question at a time, and once you pick an answer you move on: you can't go back.
37 of the 40 questions are scored. The other three are self-report statements answered on an agree–disagree scale; they have no right answer and never count towards your score. The scored questions by area:
- Pattern recognition (14 questions): matrices, picture analogies and picture completion.
- Spatial reasoning (7 questions): jigsaw pieces, shapes that turn or flip, and 3D figures.
- Working memory (7 questions): digits, grids and symbols shown for about 4 to 6 seconds, plus a word you memorize at the start and recall later.
- Numerical reasoning (6 questions): number series, a number grid and an arithmetic picture matrix.
- Logic (3 questions): two short trick questions and an ordering puzzle.
How the questions are made
All 40 questions were made for IQtonics; none is copied from a published IQ test. Eight are hand-written: five quick warm-up questions and the three self-report statements. The other 32 come from puzzle generators we built. A generator turns a question type, a difficulty level and a seed number into a question, always the same one for the same inputs, so everyone sees the same 40 questions.
An independent checker tests every generated question before use. It ignores the generator's rule, works from what you see on screen and rejects the question if:
- it cannot confirm the keyed answer (for number, logic and memory questions it solves the puzzle again from scratch);
- a second plausible rule would lead to a different answer;
- two options look the same, or a wrong option differs from the right one only by a subtle change in size or tilt;
- the explanation does not name the correct answer, or the question does not fit on one screen.
Checks and question versions
A question that fails is replaced with the next seed until one passes. Picture matrices and picture analogies get lighter automatic checks (layout, all options different); their rules are checked inside the generators and by eye. If you think a question is wrong, please tell us. The current question set has been in use since October 2026; earlier attempts are still scored against the questions those people answered.
How your score is calculated
Your score is calculated automatically from your answers, in four steps:
- Points. Each scored question is worth 0.6 + 0.2 × its difficulty level: 0.8 points at level 1 and 2.4 points at level 9. The 37 scored questions add up to 53.2 points.
- Weighted share. We divide the points you earned by the points available. Wrong or unanswered questions earn nothing, and there is no penalty for guessing.
- The curve. The share is placed on the IQ scale with IQ = 100 + 15 × (share − 0.5) ÷ 0.19. Half of the points gives 100, and every 19 percentage points above or below half is one standard deviation (15 IQ points).
- Speed bonus. If you earned at least half of the points and used less than 75% of the time, you get (0.75 − share of time used) × 4 extra points, rounded: +1 if you finish the 20-minute test within about 12½ minutes, +2 within 7½ and +3, the maximum, within 2½. Below half of the points there is no bonus.
A worked example
Say you earn 34.6 of the 53.2 points (a share of 0.65) and finish in 12 minutes, which is 60% of the time. The curve gives 100 + 15 × (0.65 − 0.5) ÷ 0.19 ≈ 111.8. You qualify for the bonus, and (0.75 − 0.60) × 4 = 0.6 rounds to 1 point. 111.8 + 1 = 112.8, so your score is 113.
Scores are rounded to a whole number and capped between 55 and 145. With the current 37 scored questions, the lowest score you can actually get is 61 (no points) and the highest is 142 (every point plus the full bonus).
Your area profile is simply the percentage of questions you got right in each area. Some areas have only a few questions, so treat area results as rough.
What your percentile means
Your percentile shows where your score sits on the theoretical IQ curve, a normal distribution with a mean of 100 and a standard deviation of 15. A score of 113 is at about the 81st percentile because, on that curve, about 81% of people score lower. It is calculated from your score alone and shown between 0.1 and 99.9.
It is not a ranking against other people who took IQtonics, and it does not come from a norming sample: we have not yet tested the questions on a large, representative group, and there is no published reliability or validity data for this test. The rule that half of the points equals 100 is a design choice, not the result of such a study.
The progress screens during the test use the same curve for your running score and an assumed typical pace of about 25 seconds per question. They are estimates, not live comparisons with other test takers.
Limitations: what the test cannot tell you
Keep these limits in mind when you read your result:
- Not clinical or diagnostic. The test cannot diagnose anything, including giftedness or learning difficulties. Clinical IQ tests such as the WAIS are given one-on-one by a licensed psychologist.
- One sitting, one estimate. Focus, tiredness, your device and interruptions all affect a score, and an online test cannot control them.
- Practice and familiarity. Everyone gets the same 40 questions, and the answer review shows the correct answers, so a retake usually scores higher through familiarity alone and is not a fresh measurement.
- Measurement error. Every score has error around it. We have not measured ours, so treat a difference of a few points as noise.
- For ages 16 and over. The test is not designed for children, and our Terms require users to be at least 16. For a child, talk to the school psychologist or a licensed psychologist; gifted-programme assessments are carried out by qualified professionals.
- Not for decisions. Do not use the result for medical, educational placement or hiring decisions. Our Terms describe the test as being for entertainment and self-development.
Editorial policy for articles and IQ scale pages
Our blog articles and IQ scale pages (the score pages and the percentile calculator) follow the same rules:
- Sources inline. Articles link to their sources where a claim is made, preferring primary sources such as the original study or the test publisher.
- Figures checked. Statistics, dates and test cut-offs are checked against those sources. Percentiles and "1 in N" figures on the IQ scale pages are calculated from the normal curve, not copied from other sites.
- AI assistance. Articles are drafted with the help of AI writing tools and checked against their sources before publishing. We do not invent quotes, experts, reviews or studies.
- Dates. Articles show when they were last updated; this page shows when it was last reviewed.
- Corrections. Email support@iqtonics.com with the page and the problem. If we got it wrong, we correct the page and update its date.
Contact
Questions about the test, your score or this page? Email support@iqtonics.com or use our contact form. We aim to reply within one business day.