Body Health CalculatorHow to Calculate TDEE for Weight Loss (Step by Step)
Calculate TDEE by estimating BMR with Mifflin-St Jeor, multiplying by an activity factor, then subtract 250 to 500 kcal per day for a typical fat loss rate of about 0.5 to 1 lb per week. Re-check after two weeks because labels and NEAT vary.
Last updated: September 2026
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What TDEE means for fat loss
Total daily energy expenditure (TDEE) is the calories you burn in a typical day including resting metabolism, digestion, movement, and exercise. Weight loss requires sustained intake below TDEE. Free calculators estimate TDEE from height, weight, age, sex, and an activity label; you still must confirm with scale trends.
NHLBI healthy weight resources emphasize gradual loss and behavioral support rather than extreme restriction. TDEE math gives you a starting calorie target, not a guarantee.
This guide walks Mifflin-St Jeor BMR, standard activity multipliers, deficit sizing, protein floors, and two-week validation habits cited in primary nutrition literature.
Step 1: Estimate BMR with Mifflin-St Jeor
For men: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age (years) + 5. For women: same formula but subtract 161 instead of adding 5. Convert pounds to kg by dividing by 2.205 and inches to cm by multiplying by 2.54 before you plug in numbers.
This resting estimate covers breathing, circulation, and cell maintenance at rest. It excludes purposeful exercise and most non-exercise movement, which arrive in step 2.
If you recently lost large amounts of weight, your measured energy needs may be lower than formulas predict. Treat BMR as hypothesis until scale data confirms it.
Step 2: Multiply by an activity factor
Sedentary (little exercise): BMR × 1.2. Lightly active (1 to 3 days/week): × 1.375. Moderately active (3 to 5 days): × 1.55. Very active (6 to 7 days): × 1.725. Extra active (physical job plus training): × 1.9. The product is estimated TDEE (maintenance calories).
If your job keeps you on your feet but you do not "work out," pick lightly active rather than sedentary. Mislabeling activity is the largest free-calculator error.
Do not also add a full workout calorie burn on top of the highest activity tier unless the tool explicitly tells you that double counting is avoided.
Dashed line: Estimated TDEE (2198 kcal)
Mifflin BMR
About 1,418 kcal
Fat-loss intake
About 1,698 kcal
Moderate-activity TDEE
About 2,198 kcal
Example TDEE build (illustrative 35-year-old woman, 70 kg, 165 cm)
| Step | Value |
|---|---|
| Mifflin BMR | ≈ 1,418 kcal/day |
| Activity (moderate × 1.55) | ≈ 2,198 kcal TDEE |
| Fat loss target (−500 kcal) | ≈ 1,698 kcal intake |
Step 3: Set a deficit and protein floor
Subtract 250 to 500 kcal/day for roughly 0.5 to 1 lb per week loss. Pair with protein near 1.6 g/kg or higher if you resistance train. NHLBI notes that very low calorie diets need medical supervision.
Weigh daily, compare weekly averages, and adjust intake by 100 to 200 kcal if loss is too fast or stalled for three weeks with accurate logs.
Spread protein across meals (ISSN guidance) and keep resistance training if medically cleared to preserve lean mass while fat falls.
Step 4: Validate TDEE with real-world data
Log food and drinks honestly for fourteen days. Compare average intake to weekly weight change. Roughly 3,500 kcal deficit cumulative equals about one pound fat loss if water is stable, but menstrual cycles and sodium can mask short-term progress.
If you lose faster than one percent of body weight per week, increase calories. If weight is flat for three weeks with verified intake, trim calories modestly or add daily steps before aggressive cuts.
Sleep deprivation and stress hormones can stall scale weight while fat loss continues. Use trend lines and waist measurements alongside TDEE math.
Minimum calories and medical flags
Many adult women should not stay below 1,200 kcal and many men not below 1,500 kcal without medical oversight, though individual needs vary. Pregnancy, eating disorder history, insulin use, and GLP-1 medications require clinician-led targets instead of generic deficits.
Dietary Guidelines AMDR still applies during fat loss: distribute remaining calories between carbohydrate and fat for micronutrient density and adherence.
Re-run TDEE estimates after every 5 to 10 kg lost because lighter bodies burn fewer calories at rest.
Worksheet: sanity-check your numbers
Write BMR, activity factor, TDEE, chosen deficit, and target intake on one page. Circle the activity label you picked and note job steps per day to revisit if weight trends disagree.
Example sanity check: if TDEE is 2,200 kcal and you eat 1,700 kcal but lose zero weight for three weeks, your true maintenance may be near 1,700, not 2,200. Adjust before cutting to 1,200.
Compare protein grams to ISSN ranges before you shrink carbs and fats. Cutting protein to preserve carb-heavy treats undermines fat loss quality.
Schedule a two-week weigh-in on the same weekday to reduce noise from weekend sodium and alcohol without obsessing over daily scale swings.
FAQs
How long before I trust my TDEE?
Give any new target 14 days of consistent intake and sleep before large changes.
Should I eat back exercise calories?
Many people rely on the activity multiplier only to avoid double counting NEAT and tracked workouts.
When should I recalculate TDEE?
After significant weight change, job activity change, or pregnancy status change.