Health calculators you can trust.
Primary sources cited (WHO, CDC, NHS, NICE, ACOG). Calculations run in your browser — your data never leaves your device.
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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 - New
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 - New
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
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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.
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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.
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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.
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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.
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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.
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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
Latest articles
Articles →-
sleepTeens Need 8-10 Hours but Get 6 — What 2 Hours Less Actually Does to Brain, Grades and Mood
The AAP and CDC both list 8-10 hours of sleep per night as essential for teens aged 13-18. Most American teens get 6 to 7. Those missing two hours produce a cognitive deficit roughly equal to a blood alcohol level of 0.05 —
6/5/2026 · 6 min
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nutritionThe EFSA 2.5L Rule: Why Most People Over-Drink Water (and the Real Number)
The 8-glasses-a-day advice is louder than the science. The European Food Safety Authority (EFSA) sets adequate intake at 2.5 L total water for men, 2.0 L for women — but that is total water, including 20-30% from food. From drinks alone you usually need 1.5 to 2.0 L.
6/4/2026 · 6 min
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mental healthOnly 2% Score Above 130 — What Your IQ Actually Means (Free 10-Question Test)
If your IQ test result was 115, you scored higher than 84 out of 100 people. Above 130? Top 2%. But your number on any short test moves 5-15 points day to day, and that variation is the whole reason psychologists never trust one score.
5/31/2026 · 6 min
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nutritionWhy a 1500-calorie diet is too low for most adults
The '1500 kcal diet' is everywhere on TikTok and Instagram, and for most adults it is below the energy their body burns at rest plus a normal day. This is what your real number looks like, and how the same person needs more at 16, less at 60, and why going under it backfires.
5/23/2026 · 7 min
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pregnancyOnly 4% of Babies Are Born on Their Due Date — The 280-Day ACOG Math
Your due date is a 280-day calculation from a rule a German obstetrician wrote in 1838. Roughly 4 in 100 babies arrive on it; the rest spread across a 5-week window that is still considered normal. Here is the ACOG-cited math, why ultrasound dating wins after week 8, and a.
5/23/2026 · 7 min
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nutritionBMR, TDEE and Calorie Deficit: The 3 Numbers That Decide Weight Loss
You cut to 1,200 calories and the scale stopped moving. The problem is almost never willpower — it is using the wrong number. BMR, TDEE and your deficit are three different figures, and most diets confuse them. Here is what each means, the formula science trusts, and the.
5/22/2026 · 7 min