BMR calculator
BMR calculator
Find your Basal Metabolic Rate — the calories your body burns at complete rest — using the Mifflin-St Jeor equation.
Track it automatically
Know the calories without the math
These numbers are your starting point. Nishnush logs the calories and macros of any meal from a single photo — so hitting your targets takes seconds, not spreadsheets.
Your result
Fill in your details to see your result.
For information only — not medical advice. Estimates use standard formulas and vary from person to person.
How it works
Your Basal Metabolic Rate (BMR) is the energy your body uses just to stay alive at rest — breathing, circulation, keeping your organs running. It is the single biggest part of the calories you burn each day.
We use the Mifflin-St Jeor equation, the formula most dietitians rely on today. To get the total calories you actually burn, multiply your BMR by an activity factor — that is what the TDEE calculator does.
The formula
Mifflin-St Jeor — Men: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5. Women: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161.
Frequently asked questions
What is the difference between BMR and TDEE? +
BMR is what you burn at complete rest. TDEE (total daily energy expenditure) is your BMR multiplied by how active you are — it is the number you actually eat around.
Should I eat at my BMR to lose weight? +
Usually not. Eating at your BMR ignores the calories you burn moving around and can be too low. Use your TDEE, then subtract a modest deficit to lose weight.
How do I track against my BMR? +
Once you know your numbers, the hard part is logging what you eat. Nishnush turns a photo of any meal into calories and macros, so staying near your target takes seconds.