TDEE Calculator

TDEE equals BMR times activity factor

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How It Works

TDEE (Total Daily Energy Expenditure) is the calorie target that accounts for everything you actually do in a day — not just resting metabolism. The simplest model is TDEE = BMR × activity factor, where the activity factor reflects your typical daily movement: sedentary (1.2, desk job + no exercise), lightly active (1.375, light exercise 1-3 days/week), moderately active (1.55, moderate exercise 3-5 days/week), very active (1.725, hard exercise 6-7 days/week), and extra active (1.9, very hard exercise + physical job). Enter your BMR (compute it with the BMR calculator first) and this page returns TDEE across all five activity levels.

Example Problem

An adult with a Harris-Benedict BMR of 1,600 kcal/day works a desk job but goes to the gym three times per week for moderate strength training. What's their TDEE?

  1. Pick the activity factor that best matches the actual weekly pattern. Three moderate sessions per week ≈ 'Moderately Active' (1.55).
  2. Apply the formula: TDEE = BMR × activity factor = 1,600 × 1.55.
  3. Multiply: 1,600 × 1.55 = 2,480.
  4. Result: TDEE ≈ 2,480 kcal/day to maintain weight.
  5. For a 1 lb/week deficit, subtract ~500 kcal/day: target ≈ 1,980 kcal/day.

Key Concepts

TDEE has four components: BMR (~60-75% of total), thermic effect of food (~10%, energy spent digesting), exercise activity thermogenesis (EAT, planned exercise), and NEAT (non-exercise activity thermogenesis — fidgeting, walking around, posture). NEAT varies widely between individuals and explains much of the difference in how some people 'naturally' stay lean. The activity multiplier approach lumps NEAT + EAT into a single factor, which is a useful approximation but undercounts very active occupations (construction, nursing) and overcounts true couch-potato lifestyles.

Applications

  • Setting a daily calorie target for weight maintenance, loss, or gain.
  • Calibrating macronutrient targets in sports nutrition (protein in g/kg, fat as % of TDEE).
  • Estimating refeed-day calories during a cutting cycle.
  • Cross-checking dietitian-recommended targets in clinical nutrition.
  • Comparing how different exercise patterns affect energy needs.

Common Mistakes

  • Picking the highest activity factor because 'I work out daily'. The 1.9 multiplier is for laborers + serious athletes — most office workers who hit the gym 3-5x/week land at 1.55.
  • Using TDEE as a static target. Weight changes alter BMR, which changes TDEE. Recalculate every 5-10 kg of body composition change.
  • Confusing TDEE with maintenance calories. They're synonymous — TDEE IS your maintenance calorie level.
  • Cutting too aggressively below TDEE. A deficit of 500-750 kcal/day is sustainable; deeper cuts trigger metabolic adaptation and muscle loss.
  • Ignoring the ±10-15% prediction error in BMR equations. Your true TDEE may be 10% above or below the calculated number; adjust based on real-world weight trends.

Frequently Asked Questions

How do you calculate TDEE?

Compute your BMR (with the BMR calculator) and multiply by an activity factor: sedentary 1.2, lightly active 1.375, moderately active 1.55, very active 1.725, extra active 1.9. TDEE = BMR × activity factor, in kcal/day.

What is the formula for TDEE?

TDEE = BMR × Activity Factor. For example, BMR 1,500 kcal/day at a moderately active level (factor 1.55) gives TDEE ≈ 2,325 kcal/day. The activity factor folds in exercise, daily movement (NEAT), and the thermic effect of food.

Which activity factor should I pick?

Be honest about typical weekly patterns: sedentary (1.2) = desk job + no exercise; lightly active (1.375) = light exercise 1-3 days/week; moderately active (1.55) = moderate exercise 3-5 days/week (most regular gym-goers); very active (1.725) = hard exercise 6-7 days/week or physically demanding job; extra active (1.9) = athletes + manual laborers.

How accurate is TDEE for weight loss?

It's a starting estimate, not a precise number. Activity factors are population-average ranges with ±10-15% error. Track your weight for 2-4 weeks at the calculated maintenance level; if you're not maintaining, adjust intake by 100-200 kcal/day until you find your true maintenance, then create your deficit from there.

Should I eat below TDEE to lose weight?

Yes — a daily deficit of 500 kcal below TDEE yields about 1 lb/week of fat loss. A 750-1000 kcal/day deficit accelerates this to 1.5-2 lb/week but risks muscle loss and metabolic adaptation. For sustainable results, most evidence supports 500 kcal/day for the average person.

Does TDEE change as I lose weight?

Yes. As weight drops, BMR drops (smaller body burns less at rest), and many people unconsciously reduce NEAT. Recalculate TDEE every 5-10 kg of weight change and adjust your deficit accordingly to avoid stalling.

Worked Examples

Strength Sports — Bulk

How many calories does a powerlifter need to gain weight?

A male powerlifter has a calculated Harris-Benedict BMR of 1,950 kcal/day and trains heavy five days a week with conditioning on the off days. He wants to add muscle on a slight surplus. What is his TDEE at the heavy-training activity factor?

  • Knowns: BMR = 1,950 kcal/day; activity factor = 1.725 (heavy / very active).
  • Apply the formula: TDEE = BMR × activity factor.
  • Substitute: TDEE = 1,950 × 1.725.
  • Multiply: 1,950 × 1.725 = 3,363.75.

TDEE ≈ 3,364 kcal/day (very active)

For a lean-bulk add roughly 200–500 kcal above TDEE per day (≈ 3,564–3,864 kcal/day total). The page also displays the moderate-activity TDEE (BMR × 1.55) in the hero box for reference.

Sedentary Weight Management

What is a sedentary office worker's daily calorie need?

A 45-year-old office worker has a Harris-Benedict BMR of 1,450 kcal/day. She drives to work, sits at a desk most of the day, and gets one light walk in the evening. What is her TDEE for a sedentary lifestyle, and how would a 1 lb/week cut be set up?

  • Knowns: BMR = 1,450 kcal/day; activity factor = 1.2 (sedentary).
  • Apply the formula: TDEE = BMR × activity factor.
  • Substitute: TDEE = 1,450 × 1.2.
  • Multiply: 1,450 × 1.2 = 1,740.

TDEE ≈ 1,740 kcal/day (sedentary)

A ~1 lb/week loss requires a 500 kcal/day deficit (since 1 lb of fat ≈ 3,500 kcal), so a cutting target would be around 1,240 kcal/day. Informational only — clinically supervised low-calorie plans should not push intake below roughly 1,200 kcal/day for women or 1,500 kcal/day for men.

Endurance Cycling

How many calories does a pro road cyclist need during a stage race?

A male road cyclist has a Harris-Benedict BMR of 1,700 kcal/day during the off-season. During a multi-day stage race he trains hard twice daily. Estimate his stage-race TDEE at the extra-active factor.

  • Knowns: BMR = 1,700 kcal/day; activity factor = 1.9 (extra active).
  • Apply the formula: TDEE = BMR × activity factor.
  • Substitute: TDEE = 1,700 × 1.9.
  • Multiply: 1,700 × 1.9 = 3,230.

TDEE ≈ 3,230 kcal/day (extra active)

Pro cyclists during Grand Tour stages can exceed 6,000–8,000 kcal/day on the hardest climbing days — the Harris-Benedict 1.9 multiplier only captures roughly habitual training load. Use a heart-rate or power-meter energy estimate plus mid-stage feeding to plan fuel for the long days.

TDEE Formula

Total Daily Energy Expenditure (TDEE) is the total kilocalories your body burns in 24 hours, including resting metabolism plus the cost of movement, exercise, and digestion. It scales basal metabolic rate by an activity multiplier drawn from the Harris-Benedict / WHO lifestyle categories:

TDEE = BMR × activity factorHarris-Benedict activity scaling

Where:

  • TDEE — total daily energy expenditure in kilocalories per day (kcal/day)
  • BMR — basal metabolic rate in kilocalories per day (kcal/day), e.g. from the Harris-Benedict or Mifflin-St Jeor equation
  • activity factor — dimensionless multiplier for habitual activity level:
    • 1.2 — Sedentary (desk job, little or no exercise)
    • 1.375 — Light Activity (light exercise 1–3 days/week)
    • 1.55 — Moderate Activity (moderate exercise 3–5 days/week)
    • 1.725 — High Activity (hard exercise 6–7 days/week)
    • 1.9 — Extreme Activity (very hard daily exercise or a physical job)

The activity factor is an estimate of habitual lifestyle, not a stage-by-stage tally — short bursts of unusually heavy training (multi-day races, hard manual-labor shifts, military selection) can exceed even the 1.9 multiplier by a wide margin. The multipliers also inherit any error in the underlying BMR estimate, so a Harris-Benedict BMR that's 5% high will produce a TDEE that's 5% high. For weight-loss or weight-gain targets, use TDEE as a starting point and adjust based on real-world results over 2–4 weeks rather than treating the number as exact. This calculator is informational only and is not a substitute for clinical judgment.

Activity Level Multipliers

The activity factor scales your basal metabolic rate by habitual lifestyle. Pick the row that best matches a typical week and read the multiplier — the calculator above already shows your TDEE for every level. When in doubt, choose the lower factor: most people overestimate how active they are, and a too-high multiplier inflates your calorie target.

Activity LevelFactorTypical lifestyle
Sedentary1.2Desk job, little or no exercise
Lightly active1.375Light exercise 1–3 days/week
Moderately active1.55Moderate exercise 3–5 days/week
Very active1.725Hard exercise 6–7 days/week
Extra active1.9Very hard exercise plus a physical job, or training twice a day

Source: Harris-Benedict activity factors, as standardized in the ACSM/WHO physical-activity-level (PAL) lifestyle categories. Factors are dimensionless estimates of habitual activity; individual energy needs vary with body composition, training intensity, and non-exercise activity.

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