Health & Fitness Calculators

Free Health & Fitness Calculators

Our health and fitness calculators help you make informed decisions about your daily wellness routine. Use our calorie intake calculator to determine how many calories you should eat per day — whether your goal is weight loss, maintenance, or muscle gain. Check your BMI by age and gender, calculate your daily water intake based on your weight, and find your optimal target heart rate for cardio training. Also includes a daily protein calculator for muscle building, a sleep debt calculator, a steps to miles converter, and a stress level calculator. All tools are free, require no sign-up, and deliver instant results.

Important: All estimates use established medical equations — Mifflin-St Jeor for calorie needs, standard BMI formula per WHO guidelines. Results are for informational purposes only and do not replace professional medical advice. Consult your doctor before starting any diet or exercise program.

How many calories should I eat a day?

Your daily calorie needs depend on age, weight, height, gender, and activity level. Our calorie intake calculator uses the Mifflin-St Jeor equation for accurate estimates. Most adults need 1,600–3,000 calories per day.

How is BMI calculated?

BMI (Body Mass Index) is calculated by dividing weight in kilograms by height in meters squared. Our BMI calculator does this instantly and shows whether you are underweight, normal, overweight, or obese based on your age and gender.

How much water should I drink daily?

General guidelines recommend 8 glasses (64 oz) per day, but your needs vary by weight, activity level, and climate. Our water intake calculator gives a personalized recommendation based on your body weight and lifestyle.

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