Health
Tools
Interactive calculators and checkers built on peer-reviewed research. Use them to understand your numbers, personalise your approach, and have a more informed conversation with your doctor.
Evidence-based calculators for your health
Cold Plunge Protocol Builder
Enter your experience level, goal, and weekly availability to get a personalised 4-week progressive cold exposure programme with temperatures, durations, breathing prep, and safety rules.
Biological Age Calculator
Rate 10 lifestyle factors to get an estimate of your biological age versus your chronological age — and identify the two areas where change has the most leverage.
Vitamin D Calculator
Enter your skin tone, sun exposure, latitude, and age to get your estimated daily D3 requirement and the supplementation dose needed to close the gap.
Sleep Debt Calculator
Enter your ideal sleep need and actual hours slept each night this week. Get your total debt, average nightly deficit, and estimated recovery time.
GLP-1 vs Berberine: Which Is Right for You?
Enter your goals, health status, and budget to get a personalised side-by-side comparison — including the mechanism difference that most articles ignore.
Creatine Calculator for Women
Enter your goal and training frequency to get a personalised daily creatine dose — based on the clinical evidence for women specifically, not adapted from male research.
Perimenopause Symptom Checker
12-question quiz scoring symptoms across 12 body systems — from irregular periods to heart palpitations. Know where you stand before your next GP appointment.