Free Tools
Health & Fitness Calculators
Quick, private, evidence-based tools to help you understand your body and plan your fitness journey. All calculations run in your browser — nothing is stored.
BMI Calculator
Enter your height and weight to calculate your BMI and see your WHO category.
More Health Calculators
Daily Calorie Calculator
Sex
Enter your details to estimate your daily calorie needs.
Ideal Weight Calculator
Enter your height to see a healthy weight range.
Daily Protein Calculator
Enter your weight to estimate daily protein needs.
Daily Water Intake Calculator
Enter your weight to estimate your daily water needs.
These calculators provide general educational estimates only and are not a substitute for professional medical or dietary advice. Personalised diet plans will be available from a qualified dietitian once they join PainFix.
Frequently Asked Questions
They use recognised, evidence-based formulas (WHO BMI categories, the Mifflin–St Jeor equation for calories). They give reliable estimates for most people, but they are general guides — not a medical diagnosis or a personalised programme.
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