Free Health & Fitness Calculators
Plan your nutrition and fitness with quick, science-based estimates. Calculate BMI, daily calorie needs, macro and protein targets, body fat, and water intake. Use them as a starting point and consult a professional for personalized advice.
- BMI CalculatorCalculate Body Mass Index from metric or imperial measurements with health-range guidance.
- Calorie CalculatorEstimate daily calories from BMR and activity level, with targets for weight loss, maintenance, or gain.
- Macro CalculatorPlan daily protein, carbs, and fat from your calorie target or estimated needs, with per-meal macro splits.
- Protein CalculatorEstimate daily protein needs from body weight, training goals, and meal count with per-meal targets.
- Body Fat CalculatorEstimate body fat percentage using the US Navy circumference method with neck, waist, and hip measurements.
- Water Intake CalculatorEstimate your daily water needs from body weight, activity level, climate, and exercise duration.
- Nutrition CalculatorConvert between macronutrient grams and calories, or split a calorie target into protein, carbs, and fat.
Frequently asked questions
- Are these health calculators a substitute for medical advice?
- No. They provide general estimates using standard formulas. For medical or dietary decisions, consult a qualified professional.
- What formula does the BMI calculator use?
- It uses the standard BMI formula (weight in kg divided by height in metres squared) and supports both metric and imperial units.