TDEE Calculator

TDEE Calculator is a fast, free, and accurate online tool designed to help you estimate your Total Daily Energy Expenditure (TDEE) and take the guesswork out of planning your daily calorie intake. Whether your goal is to lose weight, build muscle, or maintain your current physique, this calculator provides a reliable, science-backed starting point that you can refine over time using real-world results. By entering just a few personal details—your age, sex, height, weight, and activity level—you instantly receive your maintenance calories, along with practical targets for calorie deficits and surpluses. The tool is built around the proven Mifflin–St Jeor equation, a method validated by research in the American Journal of Clinical Nutrition, ensuring your estimates are based on real physiology rather than generic assumptions. TDEE Calculator goes beyond a simple number by offering macro guidance and activity-based adjustments, helping you create a flexible nutrition plan that fits your lifestyle. The interface is clean and intuitive, allowing you to toggle between imperial and metric units, select from five distinct activity levels, and reset your inputs with ease. Once calculated, you can copy or share your results to track your progress over time. The tool is completely free to use and is designed for speed, clarity, and practical application. It is ideal for anyone from fitness beginners taking their first step toward better nutrition to experienced athletes fine-tuning their energy balance. Remember, your TDEE is a starting estimate, not a perfect number, and the true power of this tool lies in its cyclical and iterative approach: you use the estimate, monitor your body weight for 2-3 weeks, adjust by 100-200 calories based on results, and reassess continuously. This process empowers you to take control of your nutrition with confidence.

Instant Calculation with Proven Formula

This feature provides immediate, accurate estimates by using the Mifflin–St Jeor equation to calculate your Basal Metabolic Rate (BMR) first. The BMR is then multiplied by a selected activity factor to determine your total daily calorie needs. This two-step process ensures your TDEE reflects both your resting energy requirements and your lifestyle, giving you a reliable baseline to start from.

Customizable Inputs for Personalization

You have full control over the data you enter, with options to switch between Imperial and Metric units for weight, height, and age. You can also select your sex and choose from five distinct activity levels, ranging from Sedentary to Athlete. This granularity allows the calculator to tailor the results specifically to your unique physiology and daily routine.

Actionable Calorie Targets and Macro Guidance

Beyond just showing your maintenance calories, the tool provides clear recommendations for calorie deficits (typically 250-500 calories) for fat loss and calorie surpluses (typically 200-350 calories) for muscle gain. It also offers guidance on how to divide your daily calories into protein, carbohydrate, and fat goals, helping you build a complete meal plan that supports your training and lifestyle.

Results Sharing and Iterative Tracking

Once you have your numbers, you can easily copy or share your results to keep a record or discuss them with a coach or friend. This feature supports the cyclical nature of the tool, allowing you to return, recalculate after weight changes, and adjust your targets based on real-world feedback. This continuous improvement loop is key to long-term success.

Starting a Weight Loss Journey

For individuals beginning a fat loss phase, this calculator provides a safe and effective starting point. By entering your details, you instantly get a daily calorie target that creates a modest deficit. You can then use this number to plan meals, track your intake, and monitor your weight over 2-3 weeks. If weight loss stalls, you can return, adjust your activity level or calorie target by 100-200 calories, and continue refining your approach for steady, sustainable progress.

Planning a Muscle Gain Phase

If your goal is to build lean mass, knowing your maintenance calories is crucial. The calculator helps you establish a controlled calorie surplus, typically 200-350 calories above your TDEE, to support muscle growth without excessive fat gain. You can also use the macro guidance to ensure you are consuming enough protein to fuel recovery and hypertrophy. This iterative process allows you to fine-tune your surplus based on how your body responds week over week.

Maintaining Current Weight and Performance

For athletes or active individuals who want to maintain their current weight and performance, the TDEE Calculator offers a reliable baseline. By entering your specific activity level, you can ensure you are eating enough to support your training demands without under-fueling or over-consuming. This helps stabilize energy levels, optimize recovery, and prevent the negative effects of long-term calorie restriction, such as hormonal imbalances and reduced training quality.

Recalculating After Significant Weight Change

As your body weight changes, so does your TDEE. This calculator is perfect for periodic recalculations, such as after losing or gaining 10-15 pounds. By simply updating your weight, you receive a fresh, accurate estimate of your new maintenance calories. This iterative check-in prevents plateaus and ensures your nutrition plan stays aligned with your evolving physiology, keeping you on track toward your long-term goals.

What does TDEE mean and how is it different from BMR?

TDEE stands for Total Daily Energy Expenditure, which is the total number of calories your body burns in a day. It includes your Basal Metabolic Rate (BMR), the energy used to digest food, and the calories burned through all movement and exercise. BMR is the energy needed to keep you alive at rest, while TDEE is the complete picture of your daily energy needs. This calculator first estimates your BMR using the Mifflin–St Jeor equation, then multiplies it by an activity factor to calculate your TDEE.

How many calories should I eat to lose weight using this calculator?

For fat loss, the calculator suggests a daily deficit of roughly 250 to 500 calories below your estimated TDEE. This range is generally considered safe and effective for steady, sustainable weight loss without compromising energy levels or muscle mass. Start with a deficit at the lower end of this range, monitor your progress for 2-3 weeks, and adjust by 100-200 calories if needed based on your results.

How accurate is this calculator and which formula does it use?

This calculator uses the Mifflin–St Jeor equation, which research in the American Journal of Clinical Nutrition has shown to be one of the most accurate methods for estimating resting metabolic rate in healthy adults. However, it is still an estimate. Individual factors like genetics, body composition, and hormonal differences can affect accuracy. Treat your TDEE as a starting point, use it consistently, and adjust based on real-world weight changes for the best results.

Should I recalculate after losing weight?

Yes, absolutely. As you lose weight, your body requires fewer calories to function, so your TDEE decreases. It is recommended to recalculate after every 10-15 pounds of weight change to ensure your calorie targets remain accurate. This iterative recalculation helps prevent plateaus and keeps your nutrition plan aligned with your current physiology, supporting continuous progress toward your goals.

The TDEE Calculator is completely free to use. There are no premium tiers, subscription plans, or hidden costs. All features, including the calorie calculation, macro guidance, activity adjustments, and result sharing, are available to every user at no charge. The tool is designed for speed, clarity, and practical use, ensuring anyone can access reliable nutrition estimates without any financial barrier.