What is TDEE — and how is it different from BMR?
Your BMR (Basal Metabolic Rate) is the energy your body burns at complete rest — keeping your heart, brain and organs running. Your TDEE (Total Daily Energy Expenditure) is your BMR multiplied by how active you are: it is the number of calories you burn in a normal day, and therefore the number that keeps your weight stable. Eat below your TDEE and you lose weight; eat above it and you gain. This calculator uses the Mifflin-St Jeor equation, the most validated formula in clinical dietetics.
Activity multipliers used
| Lifestyle | Multiplier | Typical example |
|---|---|---|
| Mostly sitting | 1.2 | Office work, little exercise |
| Lightly active | 1.375 | Walks or exercise 1–3× a week |
| Moderately active | 1.55 | Exercise 3–5× a week |
| Very active | 1.725 | Hard exercise 6–7× a week |
| Athlete / physical job | 1.9 | Daily training or manual labour |
How a calorie deficit works — safely
One kilogram of body fat stores roughly 7,700 kcal, so a daily deficit of about 500 kcal produces roughly 0.5 kg of loss per week — the pace most dietitians recommend. Bigger deficits look faster on paper but backfire in practice: muscle loss, rebound hunger, and a slower metabolism. That is why this calculator caps targets at a safe floor of around 1,200 kcal/day for women and 1,500 kcal/day for men — going below that should only happen under professional supervision.
For context in Malaysian food terms: a plate of nasi lemak with fried chicken is roughly 650–850 kcal, teh tarik around 150–180 kcal, and a bowl of pan mee 500–600 kcal. A 500 kcal deficit is often achievable by adjusting one meal and one drink — not by skipping meals.
Your macros: protein first
Within your calorie target, protein matters most: it protects muscle while you lose fat and keeps you full. Most adults aiming to lose weight do well on 1.2–1.6 g of protein per kg of body weight; muscle gain pushes toward 1.6–2.0 g/kg; adults over 60 should avoid dropping below 1.0 g/kg — work out your exact number with our protein calculator. The remaining calories are split between carbohydrates and fats — this calculator allocates roughly 25–30% of calories to fat and the rest to carbohydrates, a pattern that fits typical Malaysian meals.
Not sure where your weight itself stands? Check it against Malaysian standards with our BMI calculator (Asian & KKM cut-offs).
When to consult a dietitian
Calorie targets from any calculator assume a healthy adult. If you have diabetes, kidney disease, cancer, or a history of disordered eating — or you have been in a deficit for months without results — a generic number is not the answer. A registered dietitian adjusts your targets to your medical history, medications and blood tests, and builds them into meals you actually eat. See how 1-to-1 diet coaching works or book a personalized nutrition consultation.
Frequently asked questions
How many calories should I eat to lose weight?
Roughly 300–500 kcal below your TDEE for steady loss of 0.25–0.5 kg per week. Use the calculator above for your personal number — it accounts for your age, gender, size and activity. Never go below ~1,200 kcal (women) or ~1,500 kcal (men) without professional supervision.
What is the difference between BMR and TDEE?
BMR is what your body burns at complete rest; TDEE adds the calories burned by daily movement and exercise. Your calorie target for weight change is always set relative to TDEE, not BMR.
Is a 1,200-calorie diet safe?
For most women it is the minimum for meeting nutrient needs, and for men the floor is around 1,500 kcal. Below these levels, deficiencies and muscle loss become likely. Very-low-calorie diets exist but belong under medical and dietitian supervision only.
Why am I not losing weight in a calorie deficit?
The usual culprits: underestimating portions (a "small" nasi lemak can be 700 kcal), weekend intake cancelling weekday deficits, water retention masking fat loss, or a TDEE that has adapted downward. If a genuine deficit has stalled for 4+ weeks, a dietitian can audit what is actually happening.
Do I have to count calories forever?
No — counting is a short-term measuring tool, not a lifestyle. Dietitians typically use it for a few weeks to calibrate portions, then transition you to hand-portion or plate-method eating that holds the result without logging.
Turn your numbers into a plan — book a consultation
A calculator gives estimates. In a dietitian consultation you get a personalised plan — built on your blood tests, medical history and the food you actually eat. Available at our Mutiara Damansara clinic or online across Malaysia.
Book a dietitian consultationDisclaimer: This calculator is for general education and does not provide medical advice, diagnosis or treatment. Calorie and macronutrient figures are estimates from population formulas and may not reflect your individual requirements. Always consult a qualified healthcare professional — such as a registered dietitian or your doctor — before making significant changes to your diet, especially if you have a medical condition, are pregnant, or are under 18.
