How this calculator helps
Estimate basal metabolic rate, the approximate energy your body uses at rest for basic functions.
Inputs used
This page uses simple inputs: Age, Sex, Height, Weight. Metric and imperial support lets users choose the unit system that fits their country and preference.
Methodology and formula
BMR calculators commonly use reference equations such as Mifflin-St Jeor. These formulas use body size, age and sex to estimate resting energy needs.
How to interpret the result
BMR is not a full daily calorie target. Most people need more than BMR because normal daily activity, movement and exercise add energy needs.
Safety and limitations
BMR formulas are population-level estimates. They do not account for every health condition, medication, body composition difference or life stage.
Information on w8t.ai is for general wellness only and is not medical advice.
Frequently asked questions
What is BMR?
BMR is an estimate of energy used at rest for basic body functions.
Should I eat below BMR?
w8t.ai does not recommend extreme targets. Very low intake can be unsuitable and should be discussed with a qualified professional.
Is BMR exact?
No. It is a general estimate based on common formulas.
How is BMR different from TDEE?
TDEE includes activity; BMR is only the resting estimate.