Health & Fitness
Calorie Calculator
Estimate daily energy needs for maintenance, weight loss or gain using the Mifflin–St Jeor equation and an activity multiplier.
How to use the calorie calculator
Estimate daily energy needs for maintenance, weight loss or gain using the Mifflin–St Jeor equation and an activity multiplier. Enter the requested values and select Calculate result. Check the units and options before interpreting the answer.
Formula and calculation method
BMR = 10W + 6.25H − 5A + a sex-specific constant. Maintenance estimate = BMR × activity factor.
Worked example
For an illustrative adult, enter weight in kg, height in cm, age, equation option and activity level.
Limitations and interpretation
Results depend on inputs, assumptions and rounding. Verify results before using them for consequential decisions. Health estimates are not medical diagnoses.
Frequently asked questions
Are calorie results exact?
No. Energy needs vary between individuals.
Is this for children?
This version is designed for adults 18 and over.