Free health tools

Health Calculators

Get your exact daily nutritional targets in seconds. Enter your weight, age, gender, and activity level โ€” and get a precise, personalised number. No guessing.

Pro

Protein Calculator

Find your exact daily protein requirement based on your weight, age, gender, activity level, and goal โ€” whether you want to lose fat, build muscle, or simply maintain.

Calculates min, target, and max range
Adjusts for weight loss vs muscle building
Daily protein chart by age and gender
Best protein foods ranked
Open Calculator โ†’
Cal

Calorie Calculator

Calculate your Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE). Set your daily calorie target for weight loss, maintenance, or muscle gain.

Uses Mifflin-St Jeor formula
Shows BMR, TDEE, and goal target
5 activity levels supported
Calorie guide by goal included
Open Calculator โ†’
Fe

Iron Intake Calculator

Iron needs vary dramatically โ€” women need up to 3ร— more than men. This calculator adjusts for age, gender, pregnancy, anaemia, and whether you eat a plant-based diet.

Adjusts for vegetarian/vegan diets
Pregnancy and deficiency modes
Top iron food sources table
Heme vs non-heme absorption guide
Open Calculator โ†’
D3

Vitamin D Calculator

Over 1 billion people are Vitamin D deficient. This calculator estimates how much you get from sun exposure and tells you exactly how much to supplement.

Accounts for sun exposure and skin tone
Location and season adjustments
Deficiency risk level assessment
Blood level targets guide
Open Calculator โ†’

Why use these calculators

Generic advice fails

A 70kg active man needs 3ร— more protein than a sedentary 50kg woman. Generic "eat more protein" advice is useless without a number.

Deficiencies are invisible

You can be severely iron or Vitamin D deficient with no obvious symptoms for months. Know your numbers before symptoms appear.

Goals change requirements

Losing weight? You need more protein, not less, to preserve muscle. These calculators adjust for your actual goal.