Our Mission
TDEEBMR exists to make evidence-based nutrition science accessible to everyone. We believe that understanding your body's energy needs should not require an expensive consultation with a dietitian, a subscription to a premium app, or a degree in exercise physiology. Our mission is to provide free, accurate, and transparent calculators that empower individuals to make informed decisions about their nutrition, body composition, and health goals.
We built TDEEBMR because the internet is saturated with nutrition tools that use outdated formulas, proprietary black-box algorithms, or no scientific basis at all. Our calculators are different: every equation we implement is published in peer-reviewed scientific literature, every coefficient is traceable to its original source, and every limitation is clearly disclosed. We treat our users with the intellectual respect they deserve by showing our work.
Our Core Principles
Every calculator on TDEEBMR is built on three principles: (1) use only peer-reviewed, scientifically validated formulas; (2) cite original sources so users can verify our claims; (3) clearly communicate limitations so users understand that these are estimates, not exact measurements.
What We Offer
TDEEBMR provides a suite of interconnected nutrition and body composition calculators, each designed to address a specific aspect of dietary planning:
- TDEE Calculator: Our flagship tool estimates your Total Daily Energy Expenditure using the Mifflin-St Jeor equation with standardized Physical Activity Level multipliers from FAO/WHO/UNU research.
- BMR Calculator: Compare three established Basal Metabolic Rate formulas (Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle) side by side.
- BMI Calculator: Calculate your Body Mass Index with WHO classification categories and health context.
- Macros Calculator: Get a detailed macronutrient breakdown (protein, carbohydrates, fat) tailored to your goals and activity level.
- Body Fat Calculator: Estimate body fat percentage using the U.S. Navy circumference method.
- Ideal Weight Calculator: Compare four clinical ideal body weight formulas (Devine, Robinson, Miller, Hamwi).
- Calorie Deficit Calculator: Plan a personalized weight loss timeline with safe daily deficit targets.
- Water Intake Calculator: Estimate daily hydration needs based on body weight, activity, and climate.
- Protein Calculator: Determine optimal daily protein intake based on ISSN guidelines and activity level.
- Lean Body Mass Calculator: Calculate lean body mass using multiple established formulas.
In addition to calculators, we publish educational articles on nutrition science topics including TDEE accuracy, metabolic adaptation, activity level guidelines, and the relationship between BMR and TDEE. All educational content follows the same rigorous standards of citation and transparency that govern our calculators.
Our Editorial Team
Every piece of content and every calculator on TDEEBMR is reviewed by our multidisciplinary editorial team. Our team members bring expertise in nutrition science, exercise physiology, clinical research, and health communication.
Lead Nutritionist
Our Lead Nutritionist holds advanced credentials in clinical nutrition and dietetics. They oversee all formula implementations, verify coefficient accuracy against original research papers, and ensure that our calculator outputs align with current scientific consensus. They review every calculator update before publication.
Research Editor
The Research Editor is responsible for sourcing, verifying, and maintaining the scientific references that underpin all TDEEBMR content. They hold a graduate degree in exercise science and conduct ongoing literature reviews to identify new research that may warrant updates to our formulas or educational materials.
Fitness Advisor
Our Fitness Advisor brings practical, applied expertise from years of working with athletes and recreational exercisers. They ensure that our calculators and content are not only scientifically accurate but also practically useful for real-world application in training, body composition goals, and daily nutrition planning.
Health Communications Writer
The Health Communications Writer translates complex nutritional science into clear, accessible language that anyone can understand. They write and edit all educational articles, ensuring that content is engaging, accurate, and free from misleading claims or oversimplifications.
Our Standards for Accuracy
We hold ourselves to high standards because the information we provide directly influences people's dietary decisions. Here is how we ensure accuracy across everything we publish:
Source Requirements
We only use formulas and data from peer-reviewed scientific journals, official organizational position stands (such as the ISSN, ACSM, and Academy of Nutrition and Dietetics), and established clinical textbooks. We do not rely on blog posts, anecdotal evidence, or unverified sources. Every formula on our site can be traced back to its original publication, and we provide full citations in our Methodology page.
Review Process
All calculator implementations undergo a multi-step review process. First, the formula is coded and tested against published example calculations to verify mathematical accuracy. Second, the Lead Nutritionist reviews the implementation to confirm that it aligns with the intent and constraints described in the original research. Third, the Research Editor verifies that all citations are current and that no newer research has superseded the formula. Finally, the content is reviewed for clarity and accessibility before publication.
Update Policy
Nutrition science evolves continuously. We conduct formal reviews of all formulas and content at least annually, and we perform interim updates when significant new research is published. When we update a calculator, we document the change and the reason for it. Users can always find the most current information about our methods on the Methodology page.
Transparency Commitment
We believe that transparency builds trust. That is why we openly disclose the limitations of every formula we use, the accuracy ranges documented in the research, and the populations for which each formula is most and least appropriate. We do not overstate the precision of our calculators, and we consistently emphasize that these tools provide estimates, not exact measurements.
Our Commitment to E-E-A-T
Google's Search Quality Evaluator Guidelines emphasize four criteria for assessing the quality of health and wellness content: Experience, Expertise, Authoritativeness, and Trustworthiness (E-E-A-T). We take these criteria seriously:
E-E-A-T at TDEEBMR
Experience: Our team has practical, hands-on experience applying nutrition science in real-world settings, from clinical dietetics to athletic performance coaching.
Expertise: All content is created and reviewed by professionals with relevant academic credentials and subject-matter knowledge.
Authoritativeness: We cite primary sources, link to original research, and maintain a transparent methodology that can be independently verified.
Trustworthiness: We clearly disclose limitations, avoid sensational claims, provide a comprehensive medical disclaimer, and maintain editorial independence from any commercial interests.
Privacy and Data Practices
We respect your privacy. All calculations on TDEEBMR are performed entirely in your browser using JavaScript. No personal data, health information, or calculation inputs are transmitted to our servers or stored anywhere. You can review our complete data practices in our Privacy Policy.
Contact Us
We welcome feedback, corrections, and questions. If you believe we have made an error in a formula implementation, if you have a suggestion for a new calculator, or if you simply want to get in touch, please visit our Contact page. We read every message and respond as promptly as possible.
Thank you for trusting TDEEBMR with your nutrition planning. We are committed to earning that trust every day through accuracy, transparency, and respect for the science.