BMR Calculator
Calculate your Basal Metabolic Rate (BMR) and estimate daily calorie needs by activity level.
Daily Calorie Needs by Activity
| Activity Level | Multiplier | Calories / Day |
|---|---|---|
| Sedentary (little/no exercise) | 1.2 | -- |
| Lightly active (1-3 days/week) | 1.375 | -- |
| Moderately active (3-5 days/week) | 1.55 | -- |
| Very active (6-7 days/week) | 1.725 | -- |
| Super active (physical job/training) | 1.9 | -- |
What is BMR Calculator?
A BMR (Basal Metabolic Rate) Calculator estimates the number of calories your body needs to maintain basic physiological functions while at complete rest. These functions include breathing, circulation, cell production, and nutrient processing. Knowing your BMR is the foundation for understanding your overall energy requirements.
This calculator uses the Mifflin-St Jeor equation, which is considered one of the most accurate predictive formulas for BMR. Once you know your BMR, you can multiply it by an activity factor to estimate your Total Daily Energy Expenditure (TDEE), which helps with weight management and nutrition planning.
How to Use
- Select your gender and preferred unit system (Metric or Imperial).
- Enter your age, height, and weight in the provided fields.
- Click Calculate BMR to see your basal metabolic rate.
- Review the activity table to understand your estimated daily calorie needs at different activity levels.
Frequently Asked Questions
What is BMR?
BMR stands for Basal Metabolic Rate. It represents the minimum number of calories your body needs to function at rest, accounting for about 60-75% of total daily energy expenditure.
How accurate is the Mifflin-St Jeor formula?
The Mifflin-St Jeor equation is widely regarded as the most accurate BMR prediction formula for healthy adults, typically within 10% of measured values.
Should I eat exactly my BMR to lose weight?
No. BMR only covers resting needs. To lose weight safely, calculate your TDEE and create a moderate deficit of 250-500 calories below that level.
Does muscle mass affect BMR?
Yes. Muscle tissue burns more calories at rest than fat tissue, so individuals with higher muscle mass generally have a higher BMR.