Are these calculators completely free?
Yes — all 12 tools on caloriecalcfree.com are completely free to use. There is no account required, no subscription, no payment, and no downloads. Every tool runs instantly in your browser.
How accurate are the results?
Our tools use established scientific formulas — including Mifflin-St Jeor for calorie calculations, the US Navy circumference method for body fat, and the Karvonen method for heart rate zones. These are the same formulas used by nutritionists, dietitians, and fitness professionals. Results are estimates and individual variation applies.
Do the tools support metric and imperial units?
Yes. Every calculator on caloriecalcfree.com supports both metric (kilograms and centimetres) and imperial (pounds, feet and inches) units. Simply select your preferred unit system before entering your measurements.
Are these tools suitable for medical decisions?
Our calculators are designed for general fitness and wellness guidance only. The results are estimates and should not be used as a substitute for professional medical or dietary advice. Always consult a qualified healthcare provider before making significant changes to your diet or exercise routine, especially if you have a medical condition.
Where does my data go?
All calculations happen entirely within your browser — your personal inputs (weight, height, age, etc.) are never transmitted to our servers. We do not store your data and you never need to create an account. You can confirm this in our
Privacy Policy.
Which calorie calculator formula is most accurate?
Our calorie calculator uses the Mifflin-St Jeor equation, which a 2005 study in the Journal of the American Dietetic Association found to be the most accurate predictive formula for most people. The older Harris-Benedict formula is also provided for reference in our BMR calculator.
What is the difference between BMR and TDEE?
BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest — just to keep you alive. TDEE (Total Daily Energy Expenditure) is BMR multiplied by your activity level and represents your true daily calorie burn. Your calorie target for weight loss or gain should be based on TDEE, not BMR alone.
How often should I recalculate my calorie needs?
We recommend recalculating every 4–6 weeks or whenever your body weight changes by more than 3–5 kg. As your weight changes, so does your TDEE, which means your calorie target should be adjusted to keep progressing toward your goal.