How to Calculate BMR and TDEE: The Complete Daily Calorie Guide

Achieving your body composition goals—whether that means losing weight, maintaining weight, or building muscle mass—comes down to a fundamental law of physics: energy balance. To manage this balance, you need to understand two key metrics: Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE).

1. Basal Metabolic Rate (BMR): Rest Day Calories

Your Basal Metabolic Rate (BMR) represents the minimum number of calories your body requires to stay alive at complete rest. Even if you spent the entire day lying in bed, your body would still need these calories to power internal functions such as breathing, blood circulation, cellular repair, and hormone regulation.

BMR is calculated based on biological sex, age, height, and weight. The most widely accepted method is the revised Harris-Benedict Equation (Roza and Shizgal, 1984):

• For Men: BMR = 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) - (5.677 × age in years)
• For Women: BMR = 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) - (4.330 × age in years)

2. Total Daily Energy Expenditure (TDEE): Moving Around

Once you get out of bed and move, your energy demands increase. Your Total Daily Energy Expenditure (TDEE) includes your BMR multiplied by an activity factor:

• Sedentary (little to no exercise): BMR × 1.2
• Lightly Active (light exercise 1-3 days/week): BMR × 1.375
• Moderately Active (moderate exercise 3-5 days/week): BMR × 1.55
• Very Active (heavy exercise 6-7 days/week): BMR × 1.725
• Extrêmement active (intense double training or physical job): BMR × 1.9

Setting Calorie Goals Based on TDEE

Once you calculate your TDEE, you can adjust your daily food intake to reach your fitness goals:

• Weight Loss: Consume a moderate calorie deficit by eating 10% to 20% fewer calories than your TDEE.
• Muscle Gain: Consume a light calorie surplus by eating 10% to 15% more calories than your TDEE.
• Weight Maintenance: Consume exactly your TDEE calories.

Instead of working out these percentages manually, you can use our free online Calorie Calculator to get an instant calculation of your BMR, TDEE, and customized macronutrient suggestions.

The Budgetary Impact of TDEE (Activity Level vs. Food Expenses)

Your Total Daily Energy Expenditure (TDEE) is a strong driver of your monthly household expenses. A higher activity level means burning more fuel, which requires buying more calories to avoid unwanted weight loss.

• Calculating Calorie Costs: If your BMR is 1,600 kcal but your active TDEE is 2,400 kcal, you need 800 additional calories per day to maintain your weight. At an average cost of €4.00 per 1,000 kcal of whole healthy foods, this increase in activity costs €3.20 per day or €96 more per month in grocery bills!
• Groceries and Savings: To keep your food budget under control, you can use our Shopping Discount Calculator to calculate markdown savings and optimize your grocery shopping.
• Income Planning: To figure out how much gross salary you need to generate to cover your active lifestyle costs after tax deductions, check out our Gross to Net Salary Calculator.