All calculators
Every calculator below cites primary sources (WHO, NICE, ACOG, CDC), runs in your browser, and never sends your data anywhere.
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ADHD Test (ASRS-5)
Take the ASRS-5 — a 6-question adult ADHD screener from the World Health Organization. 90 seconds. Free. No signup. Results stay in your browser.
mental-health -
ASCVD Cardiovascular Risk Calculator
Free 2013 ACC/AHA cardiovascular risk calculator. Pooled Cohort Equations, validated for ages 40-79. 9 inputs, 30 seconds. Heart-attack risk in 10 years.
cardiovascular -
AUDIT-C alcohol use screening test
AUDIT-C 3-item alcohol screen. Validated cut-offs for men and women (Bush 1998, USPSTF 2018). Score in 30 seconds, instant interpretation.
mental-health -
Autism Test (AQ-10) — Adult Screening
Free AQ-10 autism screening test for adults (Allison, Auyeung & Baron-Cohen 2012). 10 questions, 2 minutes, scored 0–10 against the NICE referral cut-off of 6.
mental-health -
BMI Calculator
Free BMI calculator with WHO classification. Switch between kg/cm and lb/in. Sources cited (WHO, CDC, NHS), calculation runs in your browser.
metabolic -
BMR & TDEE Calculator
Get your BMR, your TDEE for your activity level, and daily calorie targets to lose, maintain or gain weight, using the Mifflin-St Jeor equation.
metabolic -
Body Fat Percentage Calculator
Free body fat percentage calculator using the US Navy circumference method (Hodgdon 1984). Tape measure only. ACE 2018 reference categories.
metabolic -
BSMAS Social Media Addiction Test (6 questions)
Take the 6-question BSMAS social media addiction screener in 90 seconds. Andreassen 2016, validated cutoffs. Free, no signup, results stay in your browser.
mental-health -
Burnout Test (OLBI)
Free OLBI burnout screen. 16 questions, 2 minutes. Measures both exhaustion and disengagement. Validated by Demerouti 2003. Anonymous, no email.
mental-health -
Caffeine half-life calculator
See your estimated caffeine half-life and the earliest time caffeine drops below 100 mg, a practical sleep threshold. Adjusts for smoking, birth control and pregnancy.
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Daily Water Intake Calculator
Personalised daily water target based on body weight, activity, climate, and life stage. EFSA 2010 + IOM 2005 baselines.
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EAT-26 Eating Attitudes Test
Free EAT-26 questionnaire online. 26 items, 5 minutes. The 1982 Garner screening tool for eating disorders. Cut-off 20. Instant interpretation.
mental-health -
Edinburgh Postnatal Depression Scale (EPDS)
EPDS 10-item screen for perinatal depression in pregnancy and the first year postpartum. Validated cut-offs (Cox 1987), self-harm flag, helplines.
mental-health -
Epworth Sleepiness Scale (ESS) — daytime sleepiness test
Validated 8-item Epworth Sleepiness Scale (Johns 1991). Scoring 0–24, four bands, plain-English interpretation, links to STOP-BANG and ISI.
cardiovascular -
Fagerström Nicotine Dependence Test (FTND)
Take the validated 6-question Fagerström FTND in 60 seconds. Heatherton 1991, used in primary care. Free, no signup, results stay in your browser.
mental-health -
Fatigue Severity Scale (FSS)
Take the validated 9-question Fatigue Severity Scale (Krupp 1989) in 60 seconds. Free, no signup, results stay in your browser. Score 1.0–7.0.
mental-health -
FINDRISC diabetes risk calculator
FINDRISC 8-question type 2 diabetes risk score. Validated by Lindström and Tuomilehto (2003). Estimates 10-year risk without a blood test.
metabolic -
Free IQ test online (10 questions, pattern recognition)
Free 10-question IQ screener in 3-5 minutes. Pattern recognition only, no signup, no email, results stay in your browser.
mental-health -
GAD-7 Anxiety Screener
Take the validated GAD-7 anxiety screener (Spitzer 2006). Seven items, two-week window, scored 0–21 with severity bands. Public domain instrument.
mental-health -
Glucose unit converter and interpretation
Convert glucose units and HbA1c (% ↔ mmol/mol). Get fasting / OGTT / random / HbA1c interpretation under ADA 2024 — normal, prediabetes, diabetes ranges.
metabolic -
Greene Climacteric Scale — Menopause Symptom Self-Test
Take the validated 21-item Greene Climacteric Scale in 2 minutes. Greene 1998, anchored to NAMS 2022. Free, no signup — answers stay in your browser.
mental-health -
HOMA-IR — insulin resistance calculator
Calculate HOMA-IR from fasting glucose (mg/dL or mmol/L) and fasting insulin. See your score and band: high sensitivity, normal, borderline or insulin resistance.
metabolic -
IIEF-5 Erectile Dysfunction Self-Test (5 questions)
Take the validated 5-question IIEF-5 erectile dysfunction self-test in 60 seconds. Rosen 1999, AUA-anchored. Free, no signup, no email
mental-health -
Insomnia Severity Index (ISI)
ISI 7-item insomnia screen with validated cut-offs (Bastien 2001). Score in 90 seconds, evidence-based next steps including CBT-I.
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Internet Gaming Disorder Test (IGDS9-SF)
Take the IGDS9-SF — 9 questions on Internet Gaming Disorder, the DSM-5-TR and ICD-11 6C51 framework. 2 minutes. Free. Results stay in your browser.
mental-health -
M-CHAT-R — Toddler Autism Screener (16-30 months)
Free M-CHAT-R toddler autism screener — Robins 2014. 20 yes/no questions, 2 minutes, AAP-recommended at the 18 and 24-month visits.
pediatric -
Macro Calculator
Get daily grams of protein, carbs and fat to cut, maintain or bulk. Free macro calculator built on Mifflin-St Jeor BMR, your TDEE and ISSN protein guidelines.
metabolic -
MDQ bipolar disorder screening test
Free MDQ bipolar screening test online. 13 yes/no questions plus 2 follow-ups. Validated by Hirschfeld 2000. Result in 2 minutes, fully private.
mental-health -
MIDAS Migraine Disability Test (5 questions)
Take the 5-question MIDAS migraine disability test in 60 seconds. Count the days migraine cost you in 3 months and get your MIDAS grade, I to IV. Free, no signup.
mental-health -
OCD Test (OCI-R)
Free OCI-R OCD screen. 18 questions, 3 minutes, no signup. Validated by Foa 2002, used by clinics worldwide. Results stay in your browser.
mental-health -
One-Rep Max (1RM) Calculator
Estimate your 1RM from a sub-maximal lift using three peer-reviewed formulas. Includes a % of 1RM training intensity table.
fitness -
PG-13-R Prolonged Grief Test (13 items)
Free PG-13-R Prolonged Grief Disorder Inventory. Prigerson 2021 — the instrument used in the DSM-5-TR field trials. 5 minutes, anonymous, answers stay in your browser.
mental-health -
PHQ-9 Depression Screener
Free, anonymous PHQ-9 depression screener — the validated 9-item questionnaire used by clinicians worldwide. Severity bucket + next-step guidance.
mental-health -
Pregnancy Due Date Calculator
Get your estimated due date, how many weeks pregnant you are and your trimester from your last period or conception date. Naegele's rule, adjusted for cycle length.
pregnancy -
PSS-10 — Perceived Stress Scale
Validated 10-item PSS-10 stress test by Cohen, Kamarck & Mermelstein. Covers the past month, scored 0–40 as low, moderate or high perceived stress.
mental-health -
PTSD test (PC-PTSD-5)
Take the PC-PTSD-5 in 1 minute. Validated 5-item DSM-5 trauma screen (Prins 2016, US National Center for PTSD). Free, private, no signup.
mental-health -
PUQE-24 Pregnancy Nausea Test (3 questions, last 24 hours)
Take the validated 3-question PUQE-24 pregnancy nausea test in 60 seconds. Koren 2002, ACOG/RCOG endorsed. Free, no signup, results stay in your browser.
pregnancy -
SCOFF eating disorder screening test
Free SCOFF questionnaire online. 5 yes/no questions, 1 minute. Validated 1999 screen for anorexia, bulimia, binge eating. Instant interpretation.
mental-health -
Sleep Apnea Test (STOP-BANG)
Free STOP-BANG sleep apnea screen. 8 yes/no questions, 60 seconds. Anesthesiologists use this before surgery worldwide. Validated by Chung 2008.
cardiovascular -
Sleep Cycle Calculator
Find the best bedtime or wake-up time using the 90-minute REM/NREM sleep cycle model. Wake at the end of a cycle, not in the middle.
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Sunscreen amount calculator (grams per application)
Calculate how many grams of sunscreen you actually need per application based on body areas, body size, and exposure time.
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UCLA Three-Item Loneliness Test
Free 3-question UCLA Loneliness Scale. Hughes 2004, validated against the 20-item version. 30 seconds, no signup, results stay in your browser.
mental-health -
VO2max — Cooper 12-minute test
Estimate VO2max from the distance you cover in 12 minutes (Cooper test, 1968), then see your fitness band, from very poor to excellent, for your sex and age.
fitness -
Waist-to-Hip Ratio Calculator
Calculate your waist-to-hip ratio (WHR) with WHO 2008 cardiometabolic risk thresholds. Often a stronger CV-risk predictor than BMI.
cardiovascular