GD&T Test

The GD&T Test is a free advanced-level, 25-minute skill test from Science of Apps. It tests geometric dimensioning and tolerancing under ASME Y14.5-2018 — feature control frames, basic dimensions and datum reference frames, form and orientation tolerances, position with material condition modifiers and bonus tolerance, and profile and runout controls. Score 70% or more on its 25 questions to earn a verifiable GD&T (ASME Y14.5) certificate (SOA-GDT). Every question is based on published standards and research — including ASME Y14.5 Dimensioning and Tolerancing (ASME) — and each answer is explained with its source.

Read the five skill areas on this page, then take the 25-minute test online — no fee, course or sign-up. You see every answer explained when you finish. Score 70% or more and you get a GD&T (ASME Y14.5) certificate straight away, on screen, as a PDF and by email, with a credential ID anyone can verify.

Yes. The questions are original scenarios written by Science of Apps, and each one is based on a public source you can read: ASME Y14.5 Dimensioning and Tolerancing (ASME). The source is shown under each question and linked in the answer review. Science of Apps doesn't copy questions from other tests.

Five skill areas with five questions each, drawn from a bank of 10 per area so a retake brings new questions: Fundamentals and Datums (Feature control frames, Basic dimensions and Datum reference frames); Form Tolerances (Flatness, Straightness and Circularity and cylindricity); Orientation Tolerances (Perpendicularity, Parallelism and Angularity); Position and Material Conditions (Position, MMC and LMC and Bonus and virtual condition); Profile and Runout (Profile of a surface, Profile of a line and Runout). Every question is an original scenario based on a published standard, official documentation or research, named under the question.

Mechanical engineer, Design engineer, Quality inspector, CMM programmer and Manufacturing engineer. It suits anyone who wants a quick, verifiable way to show GD&T skills, from students and career switchers to experienced professionals.

Yes. The GD&T Test is free and covers all of these: 25 scenario questions in 25 minutes, each answer explained with the source it comes from, so it works as interview and exam practice. It isn't a full course, so use the areas you miss as your study list. Scoring 70% or more earns a verifiable certificate.

Yes. The test is online, in English and free everywhere — people take it from India, the US, the UK, Europe, Africa, Latin America and Asia-Pacific. Your certificate is dated with your own local date and can be verified from anywhere at scienceofapps.com/certification/verify/.

25 questions — 5 from each of 5 skill areas — with a 25-minute limit. You need 70% (18 of 25) to pass and 90% for distinction.

We rate it Advanced: assumes years in the role or deep specialist knowledge. It has 25 scenario questions — 5 from each of 5 skill areas — and a 25-minute limit. You need 70% (18 of 25) to pass and 90% for distinction.

Nothing. There is no fee to take a test, to receive the certificate, to have it emailed or to verify it, and no sign-up.

On our server, not in your browser. The answers never reach the page until you submit, so a certificate can only be earned by passing. Each certificate gets a unique credential ID stored by Science of Apps.

You see your score for each area and every question with the correct answer and why, with the published source behind it. You can retake after 30 minutes, and the retake draws questions you haven't seen yet.

No. Every certificate is dated, so it always shows when you passed. Retake a test any time for a newer date or a higher score.

Yes. After you pass, Add to LinkedIn opens the Licenses & certifications form with the certificate name, Science of Apps as the issuer, the issue date, your credential ID and the verification link filled in. You can also download it as a PDF or PNG, and it's emailed to you as a PDF.

Every certificate has a credential ID and a QR code. Scanning it, or entering the ID at scienceofapps.com/certification/verify/, shows the holder's name, the certification, the score and the issue date from our records.

No. They are Science of Apps' own assessments of applied skill. They aren't issued by a university or standards body, and they work best alongside a portfolio that shows the skills in real work.