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BMR & Daily Calorie Calculator

Calculate your Basal Metabolic Rate (BMR) and daily calories needed for weight maintenance or loss.

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How BMR & Daily Calorie Calculator Works & Mathematical Formula

Calculate your Basal Metabolic Rate (BMR) and daily calories needed for weight maintenance or loss. Our online engine computes high-precision results in real-time right in your browser without transmitting your personal information over external servers.

Standard Mathematical Formula:
$$\text{Mifflin-St Jeor: } \text{BMR} = 10 \times \text{weight (kg)} + 6.25 \times \text{height (cm)} - 5 \times \text{age} + s \quad (s = +5 \text{ for male}, -161 \text{ for female})$$

Step-by-Step Calculation Example

For a 25-year-old male weighing 70 kg and 175 cm tall: BMR = (10 * 70) + (6.25 * 175) - (5 * 25) + 5 = 1,674 kcal/day. With light activity (x 1.375), daily maintenance calories are ~2,301 kcal/day.

Frequently Asked Questions

What is Basal Metabolic Rate (BMR)?

BMR represents the minimum number of calories your body needs to survive and perform basic vital functions (breathing, blood circulation, cell repair) while at complete rest.

How many calories should I eat to lose weight?

A safe, sustainable rate of weight loss is 1 pound (~0.5 kg) per week, which requires a daily caloric deficit of approximately 500 kcal below your total maintenance level (TDEE).