Total daily energy expenditure — TDEE — is the complete picture of your calorie burn in a day. Your BMR covers the body at rest, but TDEE adds everything else: walking to the bus stop, climbing stairs, doing household chores, going to the gym, even fidgeting at your desk. For most people, activity adds 20–70% on top of BMR, which is why two people with the same BMR can have very different daily needs. TDEE is the number that actually matters for meal planning.
The relationship between TDEE and your food intake decides what happens to your weight. Eat roughly at TDEE and weight holds steady; eat consistently below it and you lose weight gradually; eat above it and you gain. That sounds simple, but the most common mistake is overestimating activity — studies repeatedly show people rate themselves one or two levels more active than they are, then wonder why the maths doesn’t work. Being honest here matters more than any formula’s precision.
This calculator first estimates your BMR with the Mifflin-St Jeor equation, then multiplies it by the activity factor you choose. Use the result as a starting target, track your weight for two to three weeks, and adjust based on reality rather than theory. Small, consistent corrections beat chasing a perfect number on day one — the people who succeed at weight management are the ones who treat the first estimate as a draft, not a verdict.
How it works
The method is straightforward: TDEE = BMR × activity multiplier. BMR comes from the Mifflin-St Jeor equation (10×weight + 6.25×height − 5×age, plus 5 for men or minus 161 for women). The multipliers are the standard ones from nutrition research: 1.2 for sedentary (desk job, little exercise), 1.375 for lightly active (light exercise 1–3 days a week), 1.55 for moderately active (moderate exercise 3–5 days), 1.725 for very active (hard exercise 6–7 days) and 1.9 for extra active (physical job or twice-daily training).
For weight change, the calculator frames targets around a moderate deficit or surplus. A daily deficit of 300–500 calories typically produces a sustainable loss of about 0.25–0.5 kg per week, since a kilogram of body fat stores roughly 7,700 calories. Larger deficits often backfire through hunger, fatigue and muscle loss. And because a lighter body burns fewer calories, TDEE drifts downward as you lose weight — which is why recalculating every month or two keeps targets honest. None of this replaces professional guidance for medical conditions, eating disorders, pregnancy or athletic performance goals.
How to use this tool
- Enter your age, gender, height and weight, as with the BMR calculator.
- Choose the activity level that honestly matches your typical week — when in doubt, pick the lower one.
- Click Calculate to see your BMR, your TDEE and suggested targets.
- For gradual fat loss, aim 300–500 calories below TDEE; for gradual gain, 200–300 above.
- Track weight for 2–3 weeks, then adjust intake based on the trend.
- Recalculate every 4–6 weeks or after 3–5 kg of weight change.
Practical tips
- Pick the activity level below the one you're tempted to choose — overestimation is the number one reason calorie plans fail.
- Weigh daily but judge weekly: compare 7-day averages, since water weight swings wildly day to day.
- Protect muscle in a deficit with protein (roughly 1.6g per kg body weight) and 2–3 strength sessions a week.
- If weight stalls for 3+ weeks, cut another 150–200 calories or add a daily walk before assuming the maths is broken.
Frequently asked questions
What do the activity levels mean?
Sedentary means a desk job with little exercise; lightly active adds light exercise 1–3 days a week; moderately active means moderate exercise 3–5 days; very active means hard exercise 6–7 days; extra active covers physical jobs or twice-daily training. Most office workers who gym three times a week are 'lightly' to 'moderately' active at best — pick conservatively.
What is the difference between BMR and TDEE?
BMR is the calories your body burns at complete rest just to stay alive. TDEE is BMR plus all activity — walking, working, exercising, everything. BMR is the foundation; TDEE is the practical number for meal planning because it reflects how you actually live each day.
How do I use TDEE to lose weight?
Eat moderately below your TDEE — a deficit of 300 to 500 calories a day typically leads to steady loss of about 0.25 to 0.5 kg per week. Larger deficits often backfire through hunger and fatigue. Combine the deficit with adequate protein and strength training to lose fat while protecting muscle.
Why am I not losing weight at my calculated deficit?
The usual suspects: overestimated activity level, undercounted intake (oils, snacks and beverages are classic blind spots), water retention masking fat loss, or a TDEE that has drifted down as you got lighter. Track intake honestly for a week, compare 7-day weight averages, and recalculate TDEE at your new weight before changing anything drastic.
How often should I recalculate my TDEE?
Every 4 to 6 weeks, or after a weight change of 3–5 kg, since a lighter body burns fewer calories. Also update it when your routine changes — a new workout program, a desk job, an injury. Small regular adjustments keep your targets accurate without dramatic overhauls.
Does TDEE work for weight gain too?
Yes — the same maths in reverse. Add 200–300 calories above TDEE for gradual, mostly-muscle gain, paired with progressive strength training and enough protein. Surpluses much larger than that tend to add disproportionate fat. Hard gainers often discover they were simply less consistent with eating than they believed — track for a week to check.
Note: This tool is for general information only and is not medical advice. Calorie needs vary with health conditions, medication and body composition — consult a qualified health professional for personalised nutrition guidance.