Health Calculators & Tools

Our free health calculators help you make sense of the numbers behind your wellbeing — without needing a medical degree. Calculate your BMI and see whether you fall within a healthy weight range. Use the calorie calculator to find your daily energy needs based on the Mifflin-St Jeor equation, and set a calorie target for weight loss, maintenance, or gain. Work out your ideal protein, carbohydrate, and fat targets with the macro calculator. Find your ideal weight using four established clinical formulas (Hamwi, Devine, Robinson, and BMI range). Track your daily water intake needs based on your body weight and activity level, or plan your sleep schedule around natural 90-minute sleep cycles. All calculations happen in your browser — nothing is stored or shared.