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
Validated AQ-10 autism screening test for adults. Allison, Auyeung & Baron-Cohen (2012). 10 items, 2 minutes, NICE-recommended brief screen with.
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
Calculate your basal metabolic rate (BMR) and total daily energy expenditure (TDEE) using the Mifflin-St Jeor equation — the formula clinicians.
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
Calculate when caffeine clears your system based on half-life, intake time, smoking, contraceptives and pregnancy. Sleep-friendly cut-off and.
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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 (10-item pattern recognition)
Free 10-question IQ screener in 3-5 minutes. Pattern recognition only, no signup, no email, results stay in your browser. Estimated band on the.
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 and fasting insulin. Four bands (high sensitivity / normal / borderline / resistant) with empathic.
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
Free macro calculator using Mifflin-St Jeor BMR + ISSN protein guidelines. Cut, maintain, or bulk — we split TDEE into grams of protein, carbs, and.
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.
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MIDAS Migraine Disability Test (5 questions)
Take the validated 5-question MIDAS migraine disability test in 60 seconds. Stewart & Lipton 2001, AAN-endorsed. Free, no signup, results stay in.
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.
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
Estimate your pregnancy due date from the first day of your last period or the date of conception. Uses Naegele's rule (LMP + 280 days) per ACOG and.
pregnancy -
PSS-10 — Perceived Stress Scale
Validated 10-item PSS-10 stress test by Cohen, Kamarck & Mermelstein. 1-month window, scoring 0–40, three bands (low/moderate/high) with empathic.
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). Five fitness bands by sex and age, ACSM-aligned, with empathic.
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