Terms of Service

Last updated: April 7, 2026

These terms apply to your use of FitCalc, located at fitcalc.dev. By using any part of the site, you agree to the terms below. If you do not agree, please discontinue use.

This Is Not Medical Advice

FitCalc provides health and fitness calculators for general informational and educational purposes. The results from our tools -- including BMI scores, TDEE estimates, calorie targets, macro breakdowns, body fat estimates, ideal weight ranges, heart rate zones, and due date projections -- are based on widely used formulas and population-level averages. They are not personalized medical assessments.

You should always consult a qualified healthcare professional, registered dietitian, or certified fitness expert before making changes to your diet, exercise routine, or health regimen. Our calculators cannot account for individual medical conditions, medications, injuries, genetic factors, pregnancy complications, or other personal health variables that a trained professional would consider.

Do not use FitCalc results to self-diagnose, self-treat, or replace professional medical guidance. If you are pregnant, the due date calculator provides an estimate only -- your obstetrician or midwife should be your primary source of information about your pregnancy timeline.

What FitCalc Provides

FitCalc offers 12 browser-based health and fitness calculators covering body composition, nutrition planning, exercise performance, and wellness tracking. These tools apply established formulas (such as Mifflin-St Jeor for TDEE, Epley for one-rep max, and Karvonen for heart rate zones) to the inputs you provide and return calculated results.

All calculations happen in your browser using JavaScript. We do not process your health data on any server. The formulas we use are documented and widely recognized, but they produce estimates, not clinical measurements.

Accuracy of Results

Fitness and nutrition calculations involve inherent variability. Two people with identical height, weight, and age can have meaningfully different caloric needs based on muscle mass, hormonal profile, sleep quality, stress, and dozens of other factors that a calculator cannot measure.

Our tools give you a reasonable starting point. They are useful for general planning and goal setting. They are not a substitute for lab work, DEXA scans, metabolic testing, or hands-on assessment by a professional. We recommend treating FitCalc results as approximate benchmarks rather than precise targets.

Acceptable Use

FitCalc is free for personal use, educational purposes, and general wellness planning. You agree not to:

• Use our tools to provide medical advice to others or represent yourself as a medical professional based on FitCalc output
• Interfere with the site's operation or attempt to access systems beyond what is publicly available
• Bulk-scrape or replicate our content or tools without written permission
• Use the site for any purpose that violates applicable law

Intellectual Property

The FitCalc website -- including calculator interfaces, written content, design elements, and educational material -- is protected by copyright. You may not copy, adapt, or redistribute our content without permission.

The numerical results produced by our calculators are yours to use however you wish. You may share them with your trainer, doctor, nutritionist, or anyone else. We claim no rights over the output of your calculations.

Limitation of Liability

FitCalc and its operators shall not be held liable for any injury, health complication, or adverse outcome that results from decisions made using information provided by our tools. This includes, without limitation, dietary changes, exercise modifications, supplement decisions, or any other health-related action taken based on FitCalc results.

The site is provided "as is" without any warranties, express or implied. We do not guarantee that the tools will be continuously available, error-free, or suitable for any particular purpose. Your use of FitCalc is entirely at your own risk.

Embeds and External Links

We offer embed functionality for some calculators. You may embed these on your own website as long as you do not alter the embedded content. We are not responsible for how third-party sites contextualize or present our embedded tools.

FitCalc may link to external health and fitness resources for educational purposes. We do not control those external sites and are not responsible for their content or accuracy.

Advertising

FitCalc is a free service supported by advertising. Ads displayed on the site come from third-party networks and do not constitute endorsement by FitCalc. We are not responsible for the claims, products, or services promoted in advertisements.

Changes to These Terms

We may modify these terms at any time. Revised terms will appear on this page with an updated date. Continued use of FitCalc after a revision indicates your acceptance.

Contact

Questions about these terms? Email [email protected].