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This free TDEE calculator using the Mifflin‑St Jeor equation teaches how to calculate total daily energy expenditure for weight loss. It includes a TDEE activity multiplier chart for different lifestyles, helps answer what is a good TDEE for my age and gender, and works as a TDEE vs BMR calculator for calorie deficit planning – enter your details below.
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When a nutritional plan is designed, the most important number is often the total daily energy expenditure, or TDEE. A free TDEE calculator using the Mifflin‑St Jeor equation is provided on this page to make that calculation effortless. By entering age, weight, height, gender, and activity level, the basal metabolic rate (BMR) is first estimated using the Mifflin‑St Jeor formula. That BMR is then multiplied by an activity factor to yield the TDEE, which represents the total number of calories burned in a day. This number is the foundation for any goal, whether it is weight loss, maintenance, or muscle gain. Learning how to calculate total daily energy expenditure for weight loss is essential because a safe and sustainable deficit is created by subtracting 300‑500 calories from the TDEE.
The Mifflin‑St Jeor equation is widely recognized for its accuracy. For males, BMR is calculated as (10 × weight in kg) + (6.25 × height in cm) – (5 × age) + 5. For females, it is (10 × weight in kg) + (6.25 × height in cm) – (5 × age) – 161. The activity multipliers that follow are based on the user's description of their daily routine. A TDEE activity multiplier chart for different lifestyles is built into the calculator: 1.2 for sedentary, 1.375 for lightly active, 1.55 for moderately active, 1.725 for very active, and 1.9 for super active. These multipliers account for the calories burned through movement, exercise, and even daily activities like walking and household chores. By choosing the appropriate activity level, the TDEE calculation becomes personalized and realistic.
Many people wonder, what is a good TDEE for my age and gender? The answer depends on several variables. Younger adults, especially those with higher muscle mass, tend to have higher TDEEs. Men generally have a higher TDEE than women of the same age and weight because of greater lean body mass. As age increases, TDEE naturally declines, which is why caloric needs decrease over time. The calculator takes all of these factors into account and provides a single number that can be used immediately. When the result is compared to daily caloric intake, a clear picture of whether the current diet is causing weight gain, loss, or stability is obtained.
For those focused on fat loss, this tool also serves as a TDEE vs BMR calculator for calorie deficit planning. While BMR tells you the calories needed at complete rest, TDEE includes all activity. The difference between TDEE and BMR is the energy burned through movement and digestion, and this difference can be quite large for active individuals. By tracking both numbers over time, adjustments to diet and exercise can be made with precision. For example, if weight loss stalls, it may be because the activity level has been underestimated or because the body has adapted to a lower calorie intake. In such cases, recalculating TDEE with the correct activity multiplier often reveals the solution.
Beyond the numbers, understanding TDEE encourages a healthier relationship with food. Instead of viewing eating as a source of guilt, it is seen as fuel for the body's daily requirements. When meals are planned around TDEE, energy levels become more stable, and cravings are reduced. The calculator can be used weekly or monthly to track changes as weight is lost or gained. For those who want to explore related concepts, the BMR calculator provides a deeper look at resting metabolism, and the calorie needs calculator can help translate TDEE into a practical meal plan. Together, these tools form a comprehensive approach to nutrition and weight management.
Sophie has spent over a decade helping clients understand their energy needs and build sustainable eating habits. She believes that accurate tools like the Mifflin‑St Jeor TDEE calculator can transform how people approach weight loss and fitness.
This content has been reviewed for accuracy. It is not a substitute for professional medical advice. Always consult your healthcare provider before beginning a new diet or exercise program.