Health Calculators
Practical, evidence-based calculators to understand your body and set realistic goals.
Trusted by thousands of users worldwide for accurate, reliable health insights.
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Daily calorie target for maintaining, losing, or gaining weight.
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Calculate your Body Mass Index (BMI) to check if your weight is healthy for your height.
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Basal Metabolic Rate — calories your body burns at complete rest.
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Total Daily Energy Expenditure — your BMR plus activity.
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Protein, carb, and fat targets from your daily calories.
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A daily hydration target based on your weight and activity.
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Daily protein target based on your weight and goal.
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Estimated body fat percentage using the U.S. Navy tape-measure method.
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Estimated calories burned during an activity, using MET values.
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A reference weight range for your height, using the Devine formula.
Your Results
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About Calorie Calculator
Starting from your maintenance calories (TDEE), this calculator adds or subtracts a daily amount based on how fast you want to lose or gain weight, using roughly 7,700 kcal per kilogram of body weight.
About BMI Calculator
Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, overweight, and obesity in adults. It is calculated by dividing a person's weight (in kg) by the square of their height (in meters).
How to Interpret Your Results
| BMI Range | Category | What it means |
|---|---|---|
| < 18.5 | Underweight | You may need to put on some weight. |
| 18.5 - 24.9 | Normal | You have a normal body weight. |
| 25 - 29.9 | Overweight | You are slightly overweight. |
| 30 - 34.9 | Obese | You are obese. Consider a healthier lifestyle. |
| 35+ | Severely Obese | You are severely obese. Talk to a healthcare professional. |
About BMR Calculator
The Mifflin-St Jeor equation estimates the calories your body burns at complete rest just to keep your organs, breathing, and circulation running. It is widely considered the most accurate of the common BMR formulas for the general population.
About TDEE Calculator
TDEE takes your BMR and multiplies it by an activity factor to estimate all the calories you burn in a day — resting metabolism plus movement, exercise, and daily activity combined.
About Macro Calculator
Macronutrients — protein, carbohydrates, and fat — are the three sources of dietary calories. This calculator splits your daily calorie target into grams of each based on a diet style you choose.
About Water Intake Calculator
This estimate starts from a common baseline of 35 ml of water per kilogram of body weight, then adds more for exercise and hot or humid climates.
About Protein Calculator
Protein needs scale with body weight and activity level. These grams-per-kilogram ranges are commonly cited in sports nutrition, from general health up to muscle-building or athletic cutting phases.
About Body Fat Calculator
The U.S. Navy method estimates body fat percentage from a few tape-measure circumferences (neck, waist, and — for women — hip) rather than requiring specialized equipment. It's widely used because it's free and repeatable, even if less precise than DEXA scanning.
About Calories Burned Calculator
MET (Metabolic Equivalent of Task) values describe how intense an activity is compared to sitting still. Multiplying MET by your weight and the time spent gives a reasonable estimate of calories burned.
About Ideal Weight Calculator
The Devine formula was originally developed for medication dosing and has since become a common reference weight based on height alone. It's a starting reference point, not a strict target — frame size and muscle mass both matter too.
Understand what you're looking at
Estimates, not diagnoses
Every calculator here uses published formulas (e.g. Mifflin-St Jeor, Katch-McArdle) to estimate a value from the numbers you provide. They approximate population averages — your own body may reasonably fall outside them.
Track trends, not single readings
A single result matters less than how it changes over weeks and months. Re-run a calculator periodically as your weight, activity, or goals change.
Talk to a professional
For medical decisions — weight loss under a health condition, pregnancy, disordered eating, or medication — a doctor or registered dietitian can interpret these numbers safely for your situation.
Common questions
They rely on well-established formulas used widely in nutrition and fitness (e.g. Mifflin-St Jeor for BMR). Accuracy is generally within a reasonable margin for most healthy adults, but individual metabolism, body composition, and medical conditions can shift real values.
Calculations run when you submit a form and the result is returned to your browser. No calculator entry is saved to a database by this plugin.
Yes — calculators that involve weight or height include a unit toggle so you can enter values in kilograms/centimeters or pounds/feet-inches.
If you're new to tracking, start with BMI for a quick reference point, then TDEE and Macros if you're setting a calorie or nutrition goal.