TDEE Calculator
Find your Total Daily Energy Expenditure — the number of calories you burn per day including activity. Enter your details below to get your BMR, maintenance calories, and targets for weight loss or muscle gain. Everything is calculated instantly in your browser; nothing is stored or sent anywhere.
How to Use This Tool — Q&A
What is TDEE?
TDEE (Total Daily Energy Expenditure) is the total number of calories your body burns in a day, including your basal metabolic rate (BMR) plus calories burned through daily movement, exercise, and digestion. It's the number you use as a baseline for losing, maintaining, or gaining weight.
How is TDEE different from BMR?
BMR is the energy your body needs at complete rest just to keep your organs running. TDEE takes that number and multiplies it by an activity factor to account for the calories you burn moving around, exercising, and doing daily tasks. TDEE is always higher than BMR unless you're completely sedentary.
Which formula should I use — Mifflin-St Jeor or Harris-Benedict?
Mifflin-St Jeor is the formula most dietitians and sports scientists recommend today; multiple validation studies have found it more accurate for most adults than the older Harris-Benedict equation. Harris-Benedict (revised 1984 version) is included here for comparison, but Mifflin-St Jeor is the better default choice.
Why do the calculations differ for men and women?
At the same age, height, and weight, men typically carry more lean muscle mass than women, which burns more calories at rest. Both the Mifflin-St Jeor and Harris-Benedict equations include a separate constant for each sex to account for this difference — using the correct one for your sex matters for accuracy.
How many calories should I eat to lose weight?
A moderate, sustainable deficit is typically 500 calories/day below your TDEE, which targets roughly 0.5 kg (1 lb) of fat loss per week. Larger deficits speed up short-term loss but are harder to sustain and can increase muscle loss — this tool shows mild, moderate, and aggressive options so you can choose what's realistic for you.
Is this calculator accurate?
These formulas are population-based estimates with a typical margin of error of around 10%, since they can't account for individual differences like muscle mass, genetics, or metabolic health conditions. Use your result as a starting point, then adjust up or down every 2-3 weeks based on how your actual weight trend responds.
The Science of Human Metabolism: Breaking Down BMR, NEAT, and EAT
Total Daily Energy Expenditure, or TDEE, is not a single number your body produces in one place — it's the sum of several distinct energy-burning processes that run in parallel, all day, whether you're asleep, sitting at a desk, or mid-workout. Understanding what makes up that sum is the difference between treating a calorie target as a mysterious output from a calculator and actually understanding why the number looks the way it does.
The largest single piece of the puzzle for most people is Basal Metabolic Rate (BMR) — the energy your body burns just to stay alive at complete rest: keeping your heart beating, your lungs breathing, your organs functioning, and your cells repairing themselves. BMR typically accounts for somewhere in the range of 60-70% of total daily energy expenditure for a sedentary-to-moderately-active person, which is why formulas like Mifflin-St Jeor and Harris-Benedict — both used in this calculator — put so much weight on getting BMR right. These equations estimate BMR from your sex, age, height, and weight, because those variables correlate strongly with the amount of metabolically active tissue (mostly muscle and organ mass) your body carries.
The second component, and one that's frequently underestimated, is Non-Exercise Activity Thermogenesis (NEAT). NEAT covers everything that isn't sleeping, eating, or deliberate exercise: walking to your car, fidgeting at your desk, taking the stairs, doing housework, standing instead of sitting. Research on NEAT has shown it can vary by hundreds to over a thousand calories per day between two people of similar size, largely driven by occupation, environment, and even personality traits like restlessness. This is a major reason two people with near-identical BMI can have meaningfully different TDEE — one person's daily life might involve far more incidental movement than another's, even if neither of them thinks of themselves as "active."
Then there's Exercise Activity Thermogenesis (EAT) — the calories burned specifically through structured, deliberate workouts: a gym session, a run, a cycling class. For most non-athletes, EAT is actually a smaller slice of TDEE than people assume, which is part of why "I worked out today" doesn't automatically create the large calorie surplus room people sometimes imagine. Rounding out the picture is the Thermic Effect of Food (TEF), the energy your body spends digesting, absorbing, and processing what you eat — generally a modest 8-15% of total intake, with protein requiring more digestive energy than fats or carbohydrates. Together, BMR + NEAT + EAT + TEF form the complete TDEE equation this tool is built to approximate.
How to Calculate Your True Total Daily Energy Expenditure for Sustainable Body Recomposition
This calculator uses the standard two-step approach that's been the backbone of applied sports nutrition for decades: first estimate BMR using a validated formula (Mifflin-St Jeor is generally considered more accurate for the modern population than the older Harris-Benedict equation, though both are offered here since Harris-Benedict remains widely referenced), then multiply that BMR by an activity multiplier that scales it up based on how much you move in a typical week.
It's worth being honest about what these multipliers actually are: estimates, not measurements. A "moderately active" multiplier assumes a certain pattern of exercise and daily movement, but it can't know your specific NEAT level, your job's physical demands, or the intensity of your training sessions. This is exactly why the science-backed approach to using a TDEE number isn't to treat it as gospel — it's to treat it as a starting hypothesis. Track your actual weight trend over two to three weeks against your intake, and adjust the number up or down based on real-world results. That feedback loop is more reliable than any formula alone.
Once you have a working TDEE estimate, the next step for fat loss is applying a moderate, sustainable deficit rather than an aggressive one. A widely used rule of thumb in nutrition coaching is that roughly 7,700 kcal corresponds to about one kilogram of body fat — this is an approximation derived from the energy density of adipose tissue, not an exact physiological constant, since real-world weight change also involves water, glycogen, and some lean tissue. Using that approximation, a daily deficit of around 500 kcal works out to a projected loss of roughly 0.5 kg per week, which is broadly in line with commonly cited guidelines for a pace that's aggressive enough to produce visible progress while remaining sustainable.
Extreme deficits — cutting 1,000-1,500+ kcal below TDEE — tend to backfire for three well-documented reasons. First, a larger share of the weight lost comes from lean muscle mass rather than fat, especially without adequate protein and resistance training. Second, the body responds to prolonged severe restriction with metabolic adaptation, where NEAT and even BMR drop somewhat below what formulas predict, partly explaining plateaus. Third, and often most decisive in practice, extreme restriction is simply harder to sustain — adherence failure, not metabolic math, is the most common reason aggressive diets don't produce the promised results over months rather than weeks.
| Goal | Adjustment from TDEE | Typical Weekly Change (illustrative) |
|---|---|---|
| Aggressive fat loss | -20% to -25% | ~0.7-1.0 kg/week |
| Moderate fat loss | -15% (~500 kcal/day) | ~0.4-0.5 kg/week |
| Mild fat loss | -10% | ~0.2-0.3 kg/week |
| Maintenance | 0% (at TDEE) | ~0 kg/week |
| Lean muscle gain | +10% to +15% | ~0.2-0.4 kg/week |
Figures above are general illustrative ranges based on common coaching heuristics, not a guarantee of individual results. Actual weekly change varies by starting body composition, training status, hydration, and adherence.
The Role of Macronutrient Distribution in Fitness Coaching
Once total calories are set, how you split those calories across protein, carbohydrate, and fat has a real — though secondary — effect on outcomes, particularly during a calorie deficit. The most consistently supported recommendation across sports nutrition literature is prioritizing protein intake. General guidance for active individuals in a deficit commonly falls in the range of about 1.6-2.2 grams of protein per kilogram of bodyweight per day, a range higher than the minimum needed to simply avoid deficiency, aimed instead at maximizing muscle protein synthesis and helping preserve lean mass while calories are restricted. Adequate protein also tends to support satiety, which can make adherence to a calorie target easier day to day.
Carbohydrates and Fat: More Flexible Than Often Assumed
Once protein and total calories are fixed, the remaining split between carbohydrate and fat is considerably more flexible than diet culture often suggests. Both provide energy, and neither has been shown to hold a decisive metabolic advantage over the other for fat loss when calories and protein are equated — the right ratio is largely a matter of what supports your training performance, satiety, and long-term adherence. Endurance athletes or those doing frequent high-intensity training often benefit from relatively higher carbohydrate intake to fuel performance and replenish glycogen, while others do perfectly well with a more fat-forward distribution. This calculator's macro breakdown offers a sensible default split, but it's meant as a starting point to adjust based on how you perform and feel, not a fixed prescription.
Frequently Asked Questions
Why does this calculator give a different number than another TDEE calculator I tried?
Different calculators often use different BMR formulas (Mifflin-St Jeor vs. Harris-Benedict typically differ by a small percentage) and different activity multiplier scales. Since activity multipliers are estimates rather than precise measurements, some variation between tools is normal and expected — use your calculated number as a starting point, then adjust based on your actual weight trend over a few weeks.
How often should I recalculate my TDEE?
It's reasonable to recheck your TDEE every 4-8 weeks, or any time your bodyweight changes by roughly 5% or more, since BMR scales with body mass. Significant changes in activity level, such as starting or stopping regular training, are also good triggers to recalculate.
Is Mifflin-St Jeor or Harris-Benedict more accurate for me?
Mifflin-St Jeor is generally regarded by dietitians as more accurate for most of today's population, as it was developed later using more contemporary body composition data. Harris-Benedict, from the early 20th century and later revised, can run slightly higher for some individuals. Both are offered here since results can be compared, but treat either as an estimate to be refined against real-world results.
Why do I need to eat more protein when I'm trying to lose weight?
In a calorie deficit, your body is more prone to breaking down muscle tissue for energy alongside fat. Higher protein intake, commonly cited in the range of 1.6-2.2 g per kg of bodyweight, helps signal your body to preserve lean muscle mass, which supports a healthier body composition outcome and helps keep your metabolic rate from dropping as much during the diet.
My weight isn't changing even though I'm eating at my calculated deficit — what's going on?
This is common and usually comes down to one of a few things: activity multipliers are estimates and may not match your real NEAT and exercise levels, calorie tracking tends to underestimate actual intake, or water retention is temporarily masking fat loss. Give any change at least 2-3 weeks before concluding the number needs adjusting, and consider tracking body weight trends (weekly averages) rather than day-to-day fluctuations.