Results
Using this estimate
This calculator is for adults aged 18 or older. It estimates BMR and TDEE from sex, age, height, weight, and an activity factor; it does not measure energy expenditure or provide a personal diet plan.
Method and activity factor
BMR uses the Mifflin–St Jeor equation. TDEE multiplies that estimate by the activity factor selected here (1.2, 1.375, 1.55, 1.725, or 1.9). Choose the option that reflects usual weeks, including work activity.
Read the examples carefully
The −15% and +15% figures are arithmetic examples from TDEE, not recommended calorie targets. The −15% example is omitted when the entered measurements give a low BMI or its calculated value is below 1000 kcal/day.
Limits and privacy
The original Mifflin–St Jeor study covered ages 19–78, so values outside that range are extrapolated. Do not use this tool for pregnancy, breastfeeding, or medical nutrition planning. Copying results includes the canonical page link and displayed outputs, never the age, height, or weight you entered.
FAQ
What's the difference between BMR and TDEE?
BMR measures calories burned at rest. TDEE multiplies BMR by your activity factor to estimate total daily energy expenditure.
How should I choose my activity level?
Select the option that best reflects your weekly training and job demands. When in doubt, pick a lower level for conservative calorie estimates.
Is this medical advice?
No. These numbers are educational estimates. Seek professional medical guidance for personalised plans.
How can I use TDEE for maintenance, fat loss, or muscle gain?
Use the result as a starting point for daily calories, then check your weight trend over two to three weeks before adjusting. For fat loss, a moderate deficit is usually easier to sustain than an aggressive cut, while muscle gain usually works better with a small surplus than a large jump in calories.
What should I enter first for BMR and TDEE?
Enter age, sex, height, weight, and activity level first. Keep the activity assumption stable when comparing maintenance calories, deficit targets, or surplus targets.
Why can BMR and TDEE results differ from nearby tools?
Differences usually come from formula, activity level, body profile, and goal setting. Match those assumptions before comparing this result with another CalcBE page, spreadsheet, or external tool.