BMR estimate
BMR is the calories your body uses at rest before daily activity.
Health calculators
Calorie Calculator
Estimate BMR, maintenance calories, and daily calorie targets for weight loss, maintenance, or lean gain.
Complete guide
How to use Calorie Calculator
The Calorie Calculator estimates basal metabolic rate with the Mifflin-St Jeor formula, multiplies it by activity level, and adjusts for your goal. It also suggests a simple protein range based on body weight.
Maintenance calories
Activity level turns BMR into an estimated daily maintenance target.
Goal target
Choose loss, maintenance, or lean gain to adjust the calorie target.
Answers
Calorie Calculator FAQs
Is this medical advice?
No. It is a general calculator and not a substitute for medical or nutrition guidance.
Why are my results estimates?
Real calorie needs vary with body composition, activity, hormones, sleep, and tracking accuracy.
What units does it use?
Inputs use US-friendly inches and pounds.
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Methodology and examples
Calorie Calculator - Free Online Tool: formula, example, and use cases
Maintained by FormatNest. See the methodology, assumptions and sources below.
Formula or method
The estimate uses the entered age, sex, height, weight, and activity factor to estimate daily energy needs; it is not medical advice.
Best use cases
Use Calorie Calculator - Free Online Tool as an educational starting point for tracking or planning, then consult a qualified professional when health decisions matter.
Important: For general education only, not medical advice. Health decisions should be discussed with a qualified clinician.
Editorial note: Review the input definitions, units and assumptions before relying on results. Source: CDC and public-health guidance.