Calculate your Total Daily Energy Expenditure (TDEE). Find out exactly how many calories you need daily for weight loss, maintenance, or bulking. 100% accurate.
Whether your goal is to shed stubborn body fat, pack on lean muscle mass, or simply maintain your current physique, understanding how your body burns energy is the absolute foundation of nutritional science. The diet industry is flooded with fad diets, detox teas, and conflicting advice. However, human metabolism is governed by the undeniable laws of thermodynamics: Calories In vs. Calories Out (CICO). To successfully manipulate your weight, you must know your Total Daily Energy Expenditure (TDEE). Your TDEE is the exact number of calories your body burns in a 24-hour period, accounting for everything from breathing and sleeping to running a marathon. By utilizing our Free TDEE Calculator PRO, you can instantly determine your exact metabolic baseline and take the scientific guesswork out of your fitness journey.
To fully understand your TDEE, you must first understand your BMR. These two acronyms are frequently confused, but they represent entirely different metabolic states.
Our PRO calculator utilizes the Mifflin-St Jeor Equation, which was introduced in 1990 and is widely considered by modern dietitians and sports scientists to be the most accurate predictive metabolic formula available today (superseding the older Harris-Benedict equation).
The mathematical engine takes your gender, age, height, and weight to calculate your exact BMR. Because men naturally have less body fat and more muscle mass than women of the exact same height and weight, the formula adjusts automatically based on your biological gender selection. Once your BMR is calculated, the engine multiplies it by an Activity Multiplier (ranging from 1.2 for sedentary office workers to 1.9 for professional athletes). The resulting number is your Maintenance TDEE.
Once you have calculated your TDEE, you hold the ultimate key to body recomposition. Weight management is simply a mathematical adjustment of this baseline number.
For Weight Loss (Cutting): To lose body fat, you must be in a caloric deficit. This means you must consume fewer calories than your TDEE. A standard and sustainable medical recommendation is a 500-calorie deficit per day. Because one pound of human body fat stores roughly 3,500 calories of energy, a 500-calorie daily deficit (500 x 7 days) yields exactly one pound of fat loss per week. Our calculator automatically generates this "Cutting" macro target for you.
For Muscle Gain (Bulking): To build lean muscle mass, your body requires surplus energy. You must consume more calories than your TDEE (a caloric surplus) while engaging in progressive resistance training. A mild surplus of +300 to +500 calories per day provides enough energy for muscular hypertrophy without excessive fat gain (often referred to as a "Lean Bulk"). Our calculator automatically provides this "Bulking" target.
Your age, weight, and fitness goals are highly personal health metrics. The vast majority of generic fitness calculators or diet apps on the internet operate using server-side technology. This means every pound and metric you input is actively transmitted back to a remote database, potentially exposing your health data to targeted advertising or data brokers.
Our Free TDEE Calculator PRO is specifically engineered for absolute user privacy. The mathematical engine processes all of your physical metrics 100% locally, directly within your own device's web browser memory (RAM). Your health data literally never leaves your smartphone or computer and never touches our servers. This ensures military-grade medical data security, complete offline functionality once the initial web page is loaded, and lightning-fast calculation speeds.
The Mifflin-St Jeor equation is the most highly regarded predictive BMR formula in modern nutritional science, boasting an accuracy rate within 10% of true metabolic expenditure for the vast majority of the population. However, if you are an elite bodybuilder with exceptionally low body fat, specialized formulas like Katch-McArdle may be slightly more accurate.
No. This is a very common mistake. When you select an "Activity Level" in the calculator (such as "Moderate Exercise 3-5 days/week"), those burned exercise calories are already mathematically factored into your final TDEE. Eating extra calories on top of your TDEE target will destroy your caloric deficit and halt weight loss.
As you lose body weight, your body becomes physically smaller. A smaller body requires less energy (fewer calories) to maintain itself, breathe, and move around. Because your BMR drops as you lose weight, you must recalculate your TDEE every 10 to 15 pounds of weight loss to ensure you remain in a caloric deficit.
Absolutely not. Our Free TDEE Calculator PRO tool operates entirely locally within your web browser using JavaScript. Your age, height, weight, and caloric goals are never uploaded to any external database or cloud server, guaranteeing your absolute health privacy.