BMI Calculator vs TDEE & Calorie Calculator
Both tools are 100% free, browser-based, and require no signup. Here is how they differ so you can pick the right one for your task.
BMI Calculator
Free BMI calculator. Enter weight and height in metric or imperial to get your BMI, WHO category, BMI Prime, and healthy weight range for your height. No signup.
Use BMI Calculator →TDEE & Calorie Calculator
Free TDEE and calorie calculator. Enter your stats and activity level to get your BMR, maintenance calories, and daily calorie targets for cutting, maintaining, or bulking — with macro breakdowns. No signup.
Use Calorie Calculator →Feature Comparison
| Feature | BMI Calculator | Calorie Calculator |
|---|---|---|
| Metric (kg/cm) and imperial (lb/ft+in) with one-click toggle | ✓ | — |
| WHO BMI category: Underweight, Normal, Overweight, Obese class I/II/III | ✓ | — |
| BMI Prime — your ratio to the upper-normal limit of 25 | ✓ | — |
| Healthy weight range for your exact height | ✓ | — |
| Visual category bar showing where you fall | ✓ | — |
| Shareable URL with preset inputs | ✓ | — |
| 100% browser-based — no data sent to any server | ✓ | — |
| BMR using Mifflin-St Jeor equation (most accurate for most adults) | — | ✓ |
| All 5 activity levels shown side-by-side for easy comparison | — | ✓ |
| Goal-specific calorie targets: cut, maintain, or bulk | — | ✓ |
| Macro breakdown (protein, carbs, fat) per goal | — | ✓ |
| Metric (kg/cm) and imperial (lb/ft+in) support | — | ✓ |
| Shareable URL with preset inputs | — | ✓ |
| 100% browser-based — your data never leaves your device | — | ✓ |
| 100% free — no signup, no watermarks | ✓ | ✓ |
| Browser-based — files never uploaded | ✓ | ✓ |
When to Use Each Tool
- →Select Metric (kg/cm) or Imperial (lb/ft+in) using the toggle at the top.
- →Type your weight in kilograms (metric) or pounds (imperial).
- →Enter your height in centimeters (metric) or feet and inches (imperial).
- →Input your weight, height, age, and sex. Toggle between metric and imperial as needed.
- →Compare all 5 activity levels side-by-side. Select the one that matches your lifestyle.
- →Select Cut, Maintain, or Bulk to see your daily calorie target and macro breakdown for that goal.
Frequently Asked Questions
The World Health Organization defines a healthy BMI as 18.5 to 24.9. Below 18.5 is considered underweight, 25–29.9 is overweight, and 30 or above is obese. These ranges apply to most adults aged 18–65.
BMI is a useful population-level screening tool but has well-known limitations. It cannot distinguish fat mass from lean mass, so muscular athletes often register as "overweight" despite having very low body fat. It also does not account for fat distribution — abdominal (visceral) fat carries higher health risk than fat elsewhere. Use BMI as one data point alongside waist circumference, body fat percentage, and a conversation with your doctor.
TDEE stands for Total Daily Energy Expenditure — the total number of calories your body burns in a day including physical activity. It is calculated by multiplying your BMR by an activity factor. TDEE is your maintenance calorie level: eating at this number keeps your weight stable.
BMR (Basal Metabolic Rate) is the number of calories your body needs at complete rest just to maintain basic functions: breathing, circulation, organ function, and temperature regulation. It represents roughly 60–70% of your total daily calorie expenditure. This calculator uses the Mifflin-St Jeor equation, which research shows is the most accurate prediction formula for most adults.