HEALTH & CALORIE CALCULATOR
BMI, BMR & TDEE Calculator
Calculate your BMI, resting calorie needs, daily maintenance calories and estimated weight-loss targets.
Your estimated results
—
Calories burned at complete rest
Estimated calories to maintain your weight
Estimated daily calorie targets
About 250 calories below maintenance
About 500 calories below maintenance
About 750 calories below maintenance
BMI guide
What do BMI, BMR and TDEE mean?
These three figures help explain your current weight range, how many calories your body uses at rest and roughly how many calories you need during a normal day.
Body Mass Index
BMI compares your weight with your height. It is commonly used as a quick guide to whether someone is underweight, within a healthy range, overweight or within the obesity range.
BMI is only a general guide. It cannot tell the difference between body fat and muscle, so it may be less accurate for muscular people.
Basal Metabolic Rate
Your BMR is the estimated number of calories your body uses each day while completely at rest.
These calories keep essential functions running, including breathing, circulation, brain activity, temperature control and organ function.
Total Daily Energy Expenditure
TDEE estimates the total number of calories you use during an average day. It includes your BMR plus walking, exercise, work, household tasks and general movement.
Eating around your TDEE may maintain your current weight. Eating consistently below it may lead to weight loss.
Adult BMI ranges
BMI should be considered alongside waist size, fitness level, muscle mass, age and general health.
Using TDEE for weight loss
A calorie deficit means eating fewer calories than your estimated TDEE. A smaller deficit may produce slower but easier-to-maintain weight loss, while a larger deficit may be harder to sustain.
Gentler progress and often easier to maintain.
A common starting point for steady weight loss.
Faster on paper, but more difficult for many people to sustain.
Avoid forcing your calorie intake excessively low. Hunger, tiredness, dizziness, weakness or poor concentration may indicate that your target is too aggressive.
BMI, BMR and TDEE FAQs
Is BMI completely accurate?
No. BMI is a useful screening tool, but it does not directly measure body fat. Someone with a large amount of muscle may have a high BMI without having excessive body fat.
What is the difference between BMR and TDEE?
BMR estimates the calories your body uses at complete rest. TDEE adds the calories used through activity and movement, giving a broader estimate of your daily calorie needs.
Should I eat below my BMR?
BMR is not designed to be a calorie target. It represents the energy your body is estimated to need at rest. Consistently eating far below this figure may be difficult to sustain and may not provide enough nutrition.
Why does my activity level make such a difference?
The calculator multiplies your BMR by an activity estimate. Choosing a higher activity level increases the TDEE result because your body is expected to use more energy through movement and exercise.
Why am I not losing weight at my calculated target?
TDEE is only an estimate. Activity levels are often overestimated, food portions may be larger than expected and calorie needs can change as body weight falls. Tracking your weight trend over several weeks is more useful than judging progress from a few days.
How often should I recalculate?
Recalculate after losing or gaining a noticeable amount of weight, changing your activity level or starting a substantially different exercise routine.
Can this calculator be used during pregnancy?
No. Standard BMI and calorie formulas are not suitable for estimating pregnancy needs. Speak to a doctor, midwife or registered dietitian for appropriate guidance.