ADHD Self Check was built to solve a simple problem: most adults who suspect they have ADHD have nowhere to start. They know something is different about how their brain works, but the path from that feeling to a GP appointment can feel unclear and intimidating.
The WHO-validated Adult ADHD Self-Report Scale (ASRS-v1.1) is the most widely used ADHD screening instrument in the world. It's the same tool that GPs and psychiatrists use as a first step in assessing adult ADHD. But when we looked for a free, well-designed, mobile-friendly version that actually explained what the scores meant - we couldn't find one.
ADHD Self Check is our attempt to build that. The screener takes 2 minutes, gives you an immediate breakdown of your Part A and Part B scores, and then tells you concretely what to do next - what to say to your GP, what the diagnosis pathway looks like in your country, and what a formal assessment involves.
We implement the full 18-question ASRS-v1.1 as published by the World Health Organization and Kessler et al. (2005). The scoring follows the validated thresholds: Part A (questions 1–6) is the clinically predictive component, with a positive result defined as 4 or more questions meeting the shaded threshold. Part B (questions 7–18) provides supplementary information about symptom breadth.
Part A of the ASRS-v1.1 has been validated with 68.7% sensitivity and 99.5% specificity for adult ADHD in clinical populations. These are the figures cited in the original WHO validation study.
The ASRS-v1.1 is a screening instrument, not a diagnostic tool. A positive result indicates that a formal clinical assessment is warranted - it does not constitute a diagnosis. Only a qualified clinician can diagnose ADHD.
ADHD Self Check is designed for adults who are exploring whether ADHD might explain their experience. That might mean someone who has struggled with attention, organisation, and follow-through their whole life and never understood why. It might mean a parent who just had a child diagnosed and recognises themselves in the description. It might mean someone whose anxiety treatment hasn't worked and who wonders whether undiagnosed ADHD is part of the picture.
We've built specific pages for Australia, the UK, the US, Canada, and New Zealand because the diagnosis pathway is genuinely different in each country — and knowing the specific steps for your healthcare system makes a real difference to whether someone actually takes them.
The ADHD Self Check Workbook is a 32-page interactive PDF designed to help adults with ADHD understand their symptom profile, identify what's most affecting their daily life, and build practical strategies. It's designed to be used before, during, and after a formal assessment, and includes symptom tracking, a support map, a goal-setting framework, and a structured daily planner.
The screener will always be free. We fund the site through the workbook sale and will never charge for access to the screening tool itself or the information about how to get diagnosed.
We don't accept advertising on the screener or the screening results. We don't recommend specific clinicians in exchange for payment. The diagnosis pathway information on this site reflects our genuine understanding of each healthcare system, not commercial relationships.
Questions, corrections, or feedback: contact@adhdselfcheck.com
If you believe any clinical information on this site is inaccurate, we want to know. Email us with a source and we'll review and correct it promptly.
WHO-validated ASRS-v1.1. 2 minutes. Instant results. Used by adults in 50+ countries.
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