Our Mission
We believe everyone deserves access to accurate, science-based health information without paywalls, hidden agendas, or confusing jargon. TDEECal was created to provide a simple, transparent tool that helps people understand their calorie needs as a starting point for their health and fitness journey.
In a world filled with fad diets, miracle supplements, and conflicting nutrition advice, we wanted to create something different—a calculator that shows you exactly how your results are computed, explains the science behind it, and honestly acknowledges its limitations.
What TDEECal Offers
Science-Based Calculations
Our calculator uses peer-reviewed, scientifically validated formulas including the Mifflin-St Jeor equation (1990), Harris-Benedict equation (revised 1984), and Katch-McArdle formula. These aren't proprietary algorithms—they're established scientific methods used by researchers and healthcare professionals worldwide.
Complete Transparency
We show you exactly how every calculation is made. You can see the formulas, understand the math, and verify the results yourself. No black boxes, no mystery algorithms, no hidden processes. We even provide links to the original research papers so you can read the science directly.
Educational Content
Beyond just numbers, we explain what TDEE means, how your body uses energy, and how to interpret your results responsibly. Our goal is to help you understand the concepts, not just give you a number to follow blindly.
Privacy First
All calculations happen directly in your browser. Your personal health data never leaves your device. We don't collect, store, or sell your information. Your privacy isn't our business model—it's our promise.
100% Free
TDEECal is completely free to use with no hidden fees, premium tiers, or paywalled features. We don't sell supplements, meal plans, or fitness programs. The calculator you see is the full product—no upsells, no tricks.
Accessible Design
Our calculator works on any device—desktop, tablet, or mobile. We've designed it to be accessible to users of all abilities, following web accessibility guidelines to ensure everyone can use the tool effectively.
Important: What We Are NOT
Honesty and transparency are core to our mission. Here's what you need to understand about TDEECal and its limitations:
We Are Not Medical Professionals
TDEECal does not provide medical advice, diagnosis, or treatment. The information and calculations provided are for educational purposes only. We are not doctors, nurses, or licensed healthcare providers. If you have health concerns, medical conditions, or are taking medications that affect your metabolism, please consult a qualified healthcare professional before making any dietary changes.
We Are Not Dietitians or Nutritionists
For personalized nutrition guidance, meal planning, or dietary advice tailored to your specific health conditions, goals, or circumstances, please consult a Registered Dietitian (RD) or licensed nutritionist. Our calculator provides general estimates, not personalized nutrition plans.
We Do Not Guarantee Results
The TDEE values we provide are mathematical estimates based on population averages. Research shows these calculations are typically accurate within ±10-15% for most people, but individual variation is significant. Factors like genetics, hormones, medications, body composition, and metabolic adaptation can cause your actual needs to differ substantially from calculated estimates.
We Do Not Sell Products
TDEECal is not a front for selling supplements, diet pills, meal replacement shakes, or fitness programs. We don't have affiliate partnerships with product companies. We don't recommend specific brands or products. Our only "product" is this free calculator.
The Science Behind Our Calculator
Understanding where these numbers come from helps you use them appropriately. Here's the scientific foundation of our calculator:
Mifflin-St Jeor Equation (1990)
Developed by MD Mifflin and ST St Jeor at the University of Nevada, this equation was created from a study of 498 healthy individuals. Research published in the American Journal of Clinical Nutrition found it to be the most accurate formula for estimating BMR in both normal-weight and obese individuals.
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
Harris-Benedict Equation (Revised 1984)
Originally developed in 1919 by James Arthur Harris and Francis Gano Benedict, this was one of the first equations to estimate BMR. The revised version by Roza and Shizgal (1984) improved its accuracy and is still widely used today as a reference standard.
View Original Research (PubMed) →Katch-McArdle Formula
This formula differs from others by using lean body mass rather than total weight, making it potentially more accurate for athletes and people who know their body fat percentage. It's based on the principle that metabolic rate is more closely related to muscle mass than total body weight.
Activity Multipliers
The activity factors we use (1.2 for sedentary to 1.9 for extremely active) are based on research by the Food and Agriculture Organization (FAO), World Health Organization (WHO), and United Nations University (UNU) Joint Expert Consultation on Human Energy Requirements (2004).
View FAO/WHO/UNU Report →How to Use Your TDEE Results Responsibly
Treat It As a Starting Point
Your calculated TDEE is an estimate based on population averages. Use it as an initial target, not a definitive answer. Real-world testing over 2-4 weeks will tell you if adjustments are needed.
Monitor and Adjust
Track your weight weekly (same time, same conditions) and observe the trend over several weeks. If results don't match expectations, adjust your calorie target by 100-200 calories and observe again.
Be Conservative with Deficits
For weight loss, modest deficits (300-500 calories below TDEE) are more sustainable and preserve muscle mass better than aggressive cuts. Rapid weight loss often leads to muscle loss and metabolic adaptation.
Don't Eat Below Your BMR
Your Basal Metabolic Rate represents the minimum energy your body needs for basic survival functions. Consistently eating below this level can lead to nutrient deficiencies, muscle loss, hormonal disruption, and metabolic slowdown.
Consult Professionals When Needed
If you have specific health conditions, are pregnant or nursing, have a history of eating disorders, or need guidance beyond general estimates, please consult a registered dietitian or healthcare provider.
Your Privacy Matters
We take your privacy seriously. Here's exactly what happens with your data when you use TDEECal:
✓ What We DO
- Process all calculations locally in your browser
- Store your results only on your device (if you choose to save them)
- Use minimal, privacy-respecting analytics to improve the site
- Encrypt all connections with HTTPS
- Give you full control over any locally stored data
✗ What We DON'T Do
- Send your personal health data to any server
- Sell or share your information with third parties
- Use invasive tracking or advertising cookies
- Require account creation or email addresses
- Store any of your calculation inputs or results
For complete details, please read our full Privacy Policy.
Our Commitment to Quality
🔄 Regular Updates
We stay current with nutrition science and update our calculator, content, and formulas when new research warrants changes. Science evolves, and so do we.
📚 Evidence-Based Content
All claims and information on TDEECal are based on peer-reviewed research. We cite our sources and provide links to original studies whenever possible.
🔍 Accuracy First
We prioritize accuracy over engagement. We won't make exaggerated claims, promise unrealistic results, or use fear-based marketing to drive traffic.
👂 User Feedback
We listen to our users. If you find an error, have a suggestion, or need clarification, we want to hear from you. Your feedback helps us improve.
Get In Touch
We value your feedback, questions, and suggestions. Whether you've found an issue, have ideas for improvement, or just want to say hello, we'd love to hear from you.
Ready to Calculate Your TDEE?
Use our free, science-based calculator to estimate your daily calorie needs. It takes less than 30 seconds and requires no signup.
Go to TDEE Calculator →Legal Disclaimer
The information provided by TDEECal.com is for general educational and informational purposes only. It is not intended as, and should not be construed as, medical advice, diagnosis, or treatment. Always seek the advice of your physician, registered dietitian, or other qualified health provider with any questions you may have regarding a medical condition, dietary changes, or fitness program.
Never disregard professional medical advice or delay in seeking it because of something you have read on this website. The TDEE estimates provided are mathematical calculations based on population averages and may not accurately reflect your individual metabolic rate.
If you think you may have a medical emergency, call your doctor or emergency services immediately. TDEECal.com does not recommend or endorse any specific tests, physicians, products, procedures, opinions, or other information that may be mentioned on the site.
Last updated: May 2026