Calorie Calculator (TDEE).
BMR × activity multiplier → estimated maintenance calories.
How it works.
Enter age, sex, height and weight
These give a BMR from the Mifflin-St Jeor equation, the same default the BMR calculator uses.
Pick an activity level
Each level sets a conventional multiplier: 1.2, 1.375, 1.55, 1.725 or 1.9. These are widely used rule-of-thumb factors rather than measurements, so the multiplier stays editable.
Read maintenance calories
BMR multiplied by the activity factor estimates total daily energy expenditure (TDEE), the intake at which body weight would be expected to stay roughly stable.
Subtract only if you choose to
If you type a number to subtract, the tool shows maintenance minus that number as plain arithmetic. It never sets a target. Changes to how much you eat are worth discussing with a clinician or registered dietitian.
FAQ.
What is TDEE?
Total daily energy expenditure: everything you burn in a day, including resting metabolism, digesting food and all movement. This calculator estimates it as BMR multiplied by an activity factor.
Where do the activity multipliers come from?
The five factors, from 1.2 for mostly sitting to 1.9 for very hard daily activity, are conventional values that appear across nutrition and fitness references. They are broad estimates, not values measured for you, which is why the multiplier is editable.
Will this tell me how much to eat to lose weight?
No. It estimates maintenance only and never suggests a deficit. You can subtract a number of your own to see the arithmetic, but setting a target, especially alongside medication, is a conversation for a clinician or registered dietitian.
How accurate is the estimate?
It is an estimate built on two estimates: a predicted BMR and a generic activity factor. Real expenditure varies from person to person, so treat the figure as a starting point rather than a measurement.
Which BMR equation does it use?
Mifflin-St Jeor (Mifflin and colleagues, 1990). The BMR calculator shows it next to the revised Harris-Benedict and Katch-McArdle equations if you want to compare.
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