Frequently Asked Questions
Quick answers to common questions
General
Is the toolkit really free?
Yes. All calculators are 100% free forever. No account or login is required.
Is my health data private?
Absolutely. All calculator data stays in your browser's localStorage. We cannot access it from our servers.
What calculators are available?
We offer 34 health calculators including BMI, BMR, TDEE, body fat percentage, calorie deficit, macro, protein, water intake, ideal weight, blood pressure, heart rate zones, VO2 max, sleep cycle, diabetes risk, waist-to-hip ratio, and many more. Each calculator uses peer-reviewed medical formulas.
How accurate are the calculators?
Our calculators use clinically validated formulas that doctors and dietitians actually use, such as Mifflin-St Jeor for BMR, the WHO BMI classification, and the US Navy method for body fat. Results are reliable estimates, but they are not a substitute for professional medical diagnosis.
What is the health score?
After you complete a calculation, our health score feature gives you a quick overall wellness rating (out of 100) based on your results. It combines BMI, body fat, water intake, TDEE, and sleep data into a single score with personalized improvement tips.
Offline & Data
Can I use the calculators offline?
Yes. Once the page loads, all calculators work offline because everything runs in your browser.
What happens if I clear my browser data?
Your recent calculations are stored in your browser's localStorage. If you clear your browser data, everything will be lost. We recommend noting important results externally.
Is my data sent to any server?
No. All calculations happen entirely in your browser. Your health data never leaves your device. We do not operate any backend servers that store user health information.
Calculations
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 your BMR multiplied by an activity factor, representing the total calories you burn in a typical day. Use TDEE as your starting point for weight management goals.
Which BMI category am I in?
BMI categories are: Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (30 or above). Our BMI calculator shows your number on a color-coded gauge so you can see exactly where you fall.
The calculations seem wrong. What should I do?
Our calculators use standard medical formulas (Mifflin-St Jeor for BMR, standard BMI formula, weight-based hydration formula). Results are estimates. If you believe there's a bug, please report it via the contact page.
Are these results medical advice?
No. Our calculators provide informational estimates only. Always consult a healthcare professional for personalized medical or dietary advice.
Advertising & Partnerships
Does this site run ads?
We plan to display ads through a certified ad network to keep all calculators free. We do not accept paid guest posts or sell direct sponsored placements.
Can I contribute or suggest features?
We welcome suggestions! Reach out through the contact page with "Feature Request" as the subject, or email us directly.
Can I embed calculators on my website?
Yes. We offer a free embed widget that lets you add any calculator to your own website. Visit our widget page for the embed code and customization options.
Can I use your calculators in my app or product?
We offer embedding and integration options for health platforms, clinics, and educational institutions. Contact us with details about your use case and we'll discuss options.