What Is a Calorie Calculator (TDEE)?
A calorie calculator estimates how many calories you need each day based on your body size, age, sex, activity level, and weight goal. Unlike a simple BMR tool that only measures rest, this calculator computes total daily energy expenditure (TDEE) — your full maintenance calorie burn including walking, working, training, and everyday movement. Whether you want to lose fat, maintain your current weight, or add lean mass, TDEE is the anchor number that turns nutrition advice into a concrete daily target.
Our calculator starts with the Mifflin-St Jeor basal metabolic rate formula, then multiplies BMR by an activity factor ranging from 1.2 (sedentary) to 1.9 (extra active). Select a goal and the tool adjusts maintenance calories by ±500 kcal/day — a widely used heuristic linked to roughly one pound of weight change per week. Results update instantly as you change inputs. For resting metabolism alone, see our BMR calculator; for protein, carb, and fat splits, try our macro calculator. Review our editorial policy and methodology for how we validate health formulas.
How to Use This Calorie Calculator
- Enter your sex, age, height, and weight (imperial or metric).
- Select the activity level that best matches your typical week.
- Choose your goal: maintain weight, lose (~1 lb/week), or gain (~1 lb/week).
- Review BMR (rest), TDEE (maintenance), and goal calories side by side.
- Copy your goal calorie target and track intake with a food diary or app.
- Reassess every few weeks — adjust activity level or calories if weight trends differ from your goal.
How TDEE Is Calculated
Total daily energy expenditure combines several components. Basal metabolic rate (BMR) is the largest slice for most people — the energy required to keep organs functioning at rest. Activity thermogenesis covers deliberate exercise and non-exercise movement like fidgeting, standing, and household chores (often called NEAT). The thermic effect of food (TEF) is the energy cost of digesting meals, typically 8–12% of intake. Practical TDEE formulas fold activity and TEF into a single multiplier applied to BMR rather than calculating each term separately.
The activity multipliers used here follow the standard five-level scale recommended in clinical and sports nutrition references. A sedentary office worker might multiply BMR by 1.2. Someone who trains three to five days per week often lands near 1.55 (moderate). Daily athletes or people with physically demanding jobs may approach 1.725 to 1.9. These factors are approximations — your true multiplier depends on step count, training intensity, and lifestyle habits the categories cannot fully capture.
Consider a 30-year-old woman, 5 feet 6 inches (168 cm), 150 pounds (68 kg), with moderate activity. Her BMR calculates to roughly 1,430 kcal/day. Multiplying by 1.55 yields a TDEE near 2,217 kcal/day — her estimated maintenance. Selecting a weight-loss goal subtracts 500 kcal, targeting about 1,717 kcal/day. At that deficit, she would theoretically lose close to one pound per week, though water weight fluctuations can mask fat loss on the scale in the short term.
Major health agencies emphasize sustainable deficits and adequate nutrition over extreme restriction. The Centers for Disease Control and Prevention recommends gradual weight loss of about one to two pounds per week for most adults. The National Institutes of Health Body Weight Planner uses similar energy-balance principles to project weight change over time. Our ±500 kcal adjustment aligns with this evidence-based pace while capping very low targets at 1,200 kcal/day for safety.
TDEE Formula Overview
TDEE = BMR × Activity Multiplier
Goal calories = TDEE ± 500 (lose / gain)
| Activity level | Multiplier | Description |
|---|---|---|
| Sedentary | 1.2 | Little or no exercise |
| Light | 1.375 | Exercise 1–3 days/week |
| Moderate | 1.55 | Exercise 3–5 days/week |
| Active | 1.725 | Exercise 6–7 days/week |
| Extra active | 1.9 | Physical job or 2× daily training |
Turning TDEE Into a Nutrition Plan
Calories set the quantity; macros shape the quality of your plate. Once you have a goal calorie target, distribute protein, carbohydrates, and fats to support muscle retention during a cut or fuel performance during a bulk. Many adults benefit from 0.7–1.0 grams of protein per pound of goal body weight, especially when eating in a deficit. Our macro calculator builds on the same anthropometric inputs to suggest a balanced split.
Context matters beyond the calorie number. Sleep deprivation, chronic stress, and highly processed diets can blunt adherence even when the math is correct. Pair calorie targets with body-composition awareness via our BMI calculator and body fat calculator. Track trends over two to four weeks rather than reacting to daily scale noise. If weight is not moving as expected, adjust calories by 100–200 kcal before overhauling your entire approach.
Frequently Asked Questions
What is TDEE (total daily energy expenditure)?▼
TDEE is the total number of calories you burn in a day, including basal metabolism, physical activity, exercise, and the energy cost of digesting food. It represents your maintenance calorie level — the intake at which your weight stays roughly stable over time.
How many calories should I eat to lose weight?▼
Subtract about 500 kcal/day from your TDEE for a pace of roughly one pound of fat loss per week, since one pound of fat stores about 3,500 kcal. Our calculator applies this adjustment automatically when you select the weight-loss goal. Very low intakes (below ~1,200 kcal/day for most adults) are not recommended without medical supervision.
What activity level should I choose?▼
Pick the option that best describes your typical week, not your most active day. Sedentary fits desk jobs with little exercise. Light covers 1–3 workouts per week. Moderate fits 3–5 sessions. Active and extra-active levels are for daily training or physically demanding jobs. When unsure, start conservative and adjust based on scale trends over two to three weeks.
How accurate is this calorie calculator?▼
This tool uses the Mifflin-St Jeor equation for BMR and standard activity multipliers endorsed by major health organizations. Estimates are typically within 10–15% of measured expenditure for most adults, but individual variation exists. Use the result as a starting point and refine based on your real-world weight changes.
Should I eat back exercise calories?▼
If you selected an activity level that already includes your regular workouts, do not add exercise calories on top — that double-counts activity. If you chose sedentary but occasionally exercise, either bump your activity level or add a portion of tracked burn. Consistency matters more than chasing perfect precision every single day.