SamCalculator

TDEE Calculator

Calculate your Total Daily Energy Expenditure (TDEE), maintenance calories, fat loss calories, and muscle gain calories using science-based formulas.

Last updated: May 15, 2026

years

Recommended range: 18–80

cm
kg

Moderate exercise 3–5 days/week. Most recreational lifters and runners fall here.

What Is TDEE?

TDEE (Total Daily Energy Expenditure) is the total number of calories your body burns in a 24-hour period — at rest, in motion, and digesting food. It is the single most important number in any nutrition plan: eat at TDEE to maintain, below it to lose fat, above it to build muscle.

TDEE is built from four components:

BMR (60–75% of TDEE)

Basal metabolic rate — calories burned at complete rest just keeping your organs running.

TEF (8–15% of TDEE)

Thermic effect of food — calories spent digesting and processing what you eat. Protein has the highest TEF.

NEAT (15–30% of TDEE)

Non-exercise activity thermogenesis — fidgeting, walking, housework, standing. Hugely variable and the biggest reason two people on the same plan get different results.

EAT (0–10% of TDEE)

Exercise activity thermogenesis — calories from formal workouts. Usually smaller than people expect.

TDEE vs BMR

BMR is calories your body would burn lying in bed for 24 hours doing nothing. TDEE is BMR multiplied by an activity factor that accounts for your real day — work, walking, training, fidgeting. For most adults, TDEE is 1.2× to 2.2× higher than BMR.

Activity levelDescriptionBMR ×
BMR (No activity)Just your resting metabolism — no movement1.000
SedentaryLittle or no exercise, desk job1.200
Light Exercise1–3 workouts/week1.375
Moderate Exercise3–5 workouts/week1.550
Active6–7 workouts/week1.725
Very ActiveHard daily training + physical job1.900
AthleteTwice-daily training / competitive2.200

Multipliers from the Harris-Benedict / Mifflin-St Jeor convention, with an Athlete band for twice-daily competitive training.

How TDEE Helps Fat Loss

Fat loss happens when you consistently eat below your TDEE. The CDC recommends a gradual loss of 0.5–1 kg (1–2 lb) per week — a 500–1,000 kcal/day deficit. Larger deficits accelerate scale weight loss but cost more muscle, recovery, and adherence.

The fat-loss starting point

  • • Mild Cut (−250 kcal): ~0.25 kg/week loss. Easiest to sustain, minimal muscle loss.
  • • Standard Cut (−500 kcal): ~0.5 kg/week. The CDC-recommended sweet spot for most adults.
  • • Aggressive Cut (−750 kcal): ~0.75 kg/week. Use short-term (8–12 weeks max) with high protein.
  • • Protein: 1.8–2.4 g/kg to protect muscle in a deficit (Helms 2014, Longland 2016).
  • • Resistance training: non-negotiable for muscle retention.

How TDEE Helps Muscle Gain

Building muscle requires a calorie surplus above TDEE, sufficient protein, and progressive resistance training. The size of the surplus controls the muscle-to-fat ratio of your gains.

The muscle-gain starting point

  • • Lean Bulk (+250 kcal): ~0.25 kg/week gain. Best ratio of muscle to fat for trained lifters.
  • • Standard Bulk (+500 kcal): ~0.5 kg/week. Faster gains, slightly more fat.
  • • Aggressive Bulk (+1000 kcal): ~1.0 kg/week. Only justified for true beginners or hardgainers.
  • • Protein: 1.6–2.0 g/kg across 3–5 meals of ≥ 0.4 g/kg each.
  • • Training: progressive resistance training 3–5×/week.

The Best Calorie Deficit Strategy

The "best" deficit is the one you can sustain for the duration of your cut. Research on energy balance (Hall et al. 2016, Trexler 2014) consistently shows three principles:

  • • Start moderate. A 20–25% deficit (≈ −500 kcal/day for most adults) gives the best balance of fat loss, muscle retention, and adherence.
  • • Protect protein. Keep protein at 1.8–2.4 g/kg even when calories drop. It preserves muscle, controls hunger, and burns more in digestion.
  • • Diet-break every 8–12 weeks. Spending 1–2 weeks at maintenance restores leptin, thyroid hormones, and adherence — without losing fat-loss progress.
  • • Train hard. Resistance training in a deficit is the single best lever for improving body composition outcomes.
  • • Reassess every 2–4 weeks. TDEE drops as you lose weight. If progress stalls for 14+ days, drop calories by 100–200/day or add 10–15 min of daily walking.

Frequently Asked Questions

TDEE — Total Daily Energy Expenditure — is the total calories your body burns in 24 hours: BMR + the thermic effect of food + non-exercise activity + exercise. It is your true daily calorie need. Eat at TDEE to maintain weight, below it to lose fat, above it to build muscle.

TDEE = BMR × activity multiplier. BMR is computed from the Mifflin-St Jeor equation (or Katch-McArdle if you know body fat %). The activity multiplier ranges from 1.0 (pure BMR) to 1.9 (very active) to 2.2 (competitive athletes), based on Harris-Benedict / Mifflin convention used by the Academy of Nutrition and Dietetics.

The Mifflin-St Jeor equation underlying TDEE is accurate within ±10% for most healthy adults — the most reliable formula per a 2005 Academy of Nutrition and Dietetics review. The biggest source of real-world error is the activity multiplier — most people overestimate their activity. Treat the output as a starting point, then adjust by 100–200 kcal after 2–4 weeks based on real weight, hunger, and performance.

BMR is calories your body burns at complete rest (the minimum to keep your heart, brain, and organs running). TDEE is BMR plus everything else you burn in a day — moving, eating, working, training. For most adults, TDEE is 1.2× to 2.2× higher than BMR. BMR is what your body needs to survive; TDEE is what it needs to live your actual life.

Maintenance calories equal your TDEE — the daily intake at which your body weight stays stable over weeks. Eating at maintenance is the foundation of body recomposition (slowly losing fat while building muscle) and of any long-term performance plan. The TDEE calculator's headline result is your maintenance number.

The CDC recommends a 500–750 kcal/day deficit for sustainable fat loss of 0.5–0.75 kg (1–1.5 lb) per week. A 250-kcal mild cut works for lean individuals who want to preserve muscle aggressively. A 750-kcal aggressive cut works short-term for overweight adults with high protein intake and resistance training. Avoid deficits below 1,200 kcal/day for women or 1,500 kcal/day for men without medical supervision.

A 250–500 kcal/day surplus above TDEE is the evidence-based sweet spot for muscle gain (Slater 2019, Helms 2014). A lean bulk at +250 kcal/day yields 0.25 kg/week with the best muscle-to-fat ratio for trained lifters. +500 kcal/day works for beginners or hardgainers. +1,000 kcal/day is rarely justified — most of the extra weight becomes fat.

NEAT — non-exercise activity thermogenesis — varies hugely between people. Two adults at the same weight, height, age, and gender can differ by 600–800 kcal/day just from fidgeting, posture, and spontaneous movement. Genetics, body composition, gut microbiome, sleep, and stress also shift the actual number. A calculator gives a starting estimate; your scale and tape measure give you the real answer over 2–4 weeks.

Use Mifflin-St Jeor if you don't know your body fat % — it's the most accurate formula for the general population. Use Katch-McArdle if you have a measured body fat % (DEXA, BodPod, calipers, or a reliable smart scale) — it uses lean body mass directly and tends to be more accurate at the extremes (very lean athletes, very heavy adults). Both are offered in Advanced Settings.

Every 5–10 lb (2–4 kg) of weight change, or every 4–6 weeks during an active cut or bulk. As you lose weight, your BMR drops (a smaller body needs fewer calories). Metabolic adaptation can shave another 100–200 kcal/day off your TDEE during long cuts. Recomputing keeps your calorie target aligned with your current body.

Yes — calorie needs drop roughly 1–2% per decade after age 20, primarily because of muscle loss (sarcopenia) and slightly reduced organ activity. A 25-year-old man might need 2,800 kcal/day; the same man at 65 needs about 2,200 kcal/day. Strength training is the single best lever to preserve muscle and slow this decline.

Be honest and conservative — most adults overestimate. Sedentary = desk job, no formal exercise. Light = 1–3 days/week. Moderate = 3–5 days/week. Active = 6–7 days/week. Very Active = hard training + physical job. Athlete = twice-daily competitive training. Pick BMR only if you want pure resting metabolism for medical or curiosity reasons.

Most common reasons: (1) undercounting food — humans typically underestimate by 20–40% (Lichtman 1992, NEJM); (2) overestimating activity; (3) water retention from sodium, hormones, or new training; (4) TDEE dropping with weight loss; (5) inconsistent tracking. Weigh food, log everything, recalculate every 5–10 lb, and trust 2-week trends, not daily fluctuations.

Short-term eating below BMR is fine and sometimes necessary for heavier adults pursuing rapid initial loss. But eating below BMR for weeks risks excessive muscle loss, hormonal disruption (low T3, low leptin, irregular menstruation), and poor adherence. Most evidence-based recommendations cap deficits at 25% of TDEE and never below ~1,200 kcal/day for women or ~1,500 kcal/day for men without medical supervision.

Cutting: protein 2.0–2.4 g/kg, fat 20–30% of calories, carbs as the remainder. Bulking: protein 1.6–2.0 g/kg, fat 20–30% of calories, carbs as the remainder. Maintenance: protein 1.4–1.8 g/kg, fat 25–30%, carbs as the remainder. Protein is the priority macro in every phase. The macro panel above auto-generates these splits from your TDEE.

Methodology, Authors & Review

Authored by

SamCalculator Editorial Team

A team of writers and analysts producing evidence-based health, finance, and fitness tools, anchored to peer-reviewed research and official US public-health guidance.

Editorial standards

Cross-checked, not clinical advice

Formulas, ranges, and recommendations on this page are cross-checked against the USDA Dietary Guidelines, the CDC Adult BMI classification, the Mifflin-St Jeor BMR equation, the ISSN Position Stand on Protein and Exercise, and the AND/DC/ACSM joint athletic nutrition consensus. SamCalculator does not employ licensed clinicians; this page is general education, not medical or dietetic advice.

Methodology

BMR is calculated using the Mifflin-St Jeor equation (1990) — the most accurate formula per the Academy of Nutrition and Dietetics. Katch-McArdle is offered when body fat % is known. TDEE = BMR × activity multiplier, with 7 PAL bands ranging from 1.0 (BMR only) to 2.2 (competitive athlete). BMI is computed as weight (kg) ÷ height² (m²) and classified per CDC adult thresholds. Goal calorie targets apply ±250/500/750/1000 kcal/day to TDEE. Macros are calculated with body-weight-anchored protein (1.6–2.2 g/kg by phase), 25–28% of calories from fat, and carbs as the remainder. Weight-change predictions use the 7,700 kcal ≈ 1 kg of body mass approximation. Results are estimates and should be re-evaluated every 2–4 weeks.

Last reviewed: May 15, 2026

Scientific References

  1. USDA & HHS — Dietary Guidelines for Americans, 2020–2025
  2. IOM — Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids
  3. CDC — Adult BMI Categories
  4. Mifflin MD, St Jeor ST, et al. (1990). A new predictive equation for resting energy expenditure. Am J Clin Nutr.
  5. Jäger R, et al. (2017). ISSN Position Stand: Protein and Exercise. JISSN.
  6. Thomas DT, Erdman KA, Burke LM. (2016). AND/DC/ACSM Position: Nutrition and Athletic Performance.
  7. Longland TM, et al. (2016). Higher compared with lower dietary protein during an energy deficit. Am J Clin Nutr.
  8. Hall KD, et al. (2016). Energy expenditure and body composition changes after an isocaloric ketogenic diet. Am J Clin Nutr.
  9. Trexler ET, Smith-Ryan AE, Norton LE. (2014). Metabolic adaptation to weight loss: implications for the athlete. JISSN.
  10. Helms ER, Aragon AA, Fitschen PJ. (2014). Evidence-based recommendations for natural bodybuilding contest preparation. JISSN.

Health disclaimer: This TDEE calculator is for general informational and educational purposes only and is not a substitute for personalized advice from a registered dietitian (RD/RDN), licensed nutritionist, or board-certified physician. People with chronic kidney disease, liver disease, thyroid or metabolic disorders, eating disorders, or who are pregnant or breastfeeding must consult a clinician before changing calorie intake. TDEE estimates assume otherwise healthy adults aged 18–80.

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