This daily calories calculator estimates your basal metabolic rate and your total daily energy expenditure. Together they set a realistic starting point, whether you want to lose weight or hold it steady.
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Everything is calculated in your browser. Nothing is sent or stored. This is a reference figure, not a diagnosis.
How we work out daily calories
First we calculate basal metabolic rate using the Mifflin-St Jeor equation, which takes your weight, height, age and sex. Then we multiply that figure by an activity factor to reach total daily energy expenditure, or TDEE. We use Mifflin-St Jeor because it fits modern populations better than the older Harris-Benedict equation.
The most common mistake: the activity multiplier
Most people pick an activity level that runs too high. For example, working at a desk and training four times a week still counts as moderate rather than very active. Very active means physical work all day, or two training sessions daily. So choosing the wrong multiplier can add three to four hundred to your estimate, and that alone explains why the scale will not move.
How to use the daily calories number
To lose weight, subtract fifteen to twenty per cent from TDEE, and no more. A deeper deficit speeds up muscle loss and drags your metabolic rate down. Hold it for two weeks, weigh yourself at the same time each morning, and read the weekly average rather than any single day. If that average has not moved, then drop a hundred calories or add daily steps. Also try the BMI calculator.
When the estimate stops explaining anything
If you have held a consistent deficit for eight weeks and your weight still has not moved, the problem is no longer arithmetic. Usually one of three things explains it: metabolic adaptation after long-term dieting, an underactive thyroid, or an intake estimate that misses cooking oil and drinks. A metabolic assessment and a thyroid panel answer two of those three with numbers.
Why two people the same size need different daily calories
Metabolic rate adapts to your dieting history. Therefore two people with identical height and weight can have real requirements that differ by several hundred calories. Someone who has spent years in and out of restriction typically sits lower than the formula predicts. That said, it is not a reason to eat less. Instead, treat the estimate as a hypothesis to test for two weeks. The Ministry of Health Malaysia publishes general guidance. Book a consultation. Pair the estimate with the BMI calculator and the how to lose weight guide.
Activity factors and what they mean
Activity level is the part people most often overrate, and it is also the part that moves the answer most. The table below shows the exact factors this calculator uses.
| Activity level | Factor | What it usually means |
|---|---|---|
| Desk work | 1.2 | Sitting most of the day, little deliberate exercise |
| Light, 1-3 days | 1.375 | Light exercise or sport one to three days a week |
| Moderate, 3-5 days | 1.55 | Moderate exercise three to five days a week |
| Active, 6-7 days | 1.725 | Hard exercise six to seven days a week |
| Very active | 1.9 | Physical job plus hard training, or twice-daily sessions |
Resting metabolic rate is estimated with the Mifflin-St Jeor equation, then multiplied by the factor above. Most people overestimate their own activity level, so if the scale is not moving as the number predicts, the factor is the first thing to drop.
Source: National Health and Morbidity Survey 2023, Ministry of Health Malaysia. These four figures are the reason a calorie number on its own rarely explains a stalled result.
Why a calorie number alone is not enough
A TDEE figure assumes your activity, sleep and intake are steady. For most people none of the three is steady, which is why a number that looks right on paper still does not move the scale. If you have held calories for two to three weeks and nothing has shifted, a metabolic assessment and a body composition test give you what a calculator cannot.
