About CalorieCalculator.uk
We help UK residents make informed decisions about nutrition and health using evidence-based tools aligned with NHS guidelines.
Our Mission
CalorieCalculator.uk was created to provide UK residents with a free, accurate, and easy-to-use calorie calculator that aligns with NHS guidelines. We believe everyone deserves access to quality health tools without paying subscription fees or navigating confusing interfaces.
Our calculator helps you estimate your daily calorie needs for weight loss, maintenance, or muscle gain using scientifically-validated formulas and UK-friendly units like stones and pounds.
Unlike many calorie calculators online, we specifically follow the NHS recommendation of a 600 kcal/day deficit for safe, sustainable weight loss of 0.5–1 kg per week. Our calculations use the Mifflin-St Jeor equation, which research published in the Journal of the American Dietetic Association found to be the most accurate for estimating resting metabolic rate.
Our Evidence-Based Approach
Scientific Formulas
We use the Mifflin-St Jeor equation (1990) as our default formula, which studies show predicts actual resting metabolic rate within 10% for most adults. We also offer Harris-Benedict (1919, revised 1984) and Katch-McArdle for users who know their body fat percentage. Each formula is fully explained so you understand how your results are calculated.
NHS Guidelines Integration
Our weight loss recommendations follow NHS Choices guidance: a deficit of approximately 600 kcal per day to achieve a safe loss of 0.5–1 kg (1–2 lbs) per week. We never recommend going below 1,400 kcal/day for women or 1,900 kcal/day for men without noting the need for medical supervision, in line with NHS advice.
Transparent Methodology
Every calculation is explained with the actual mathematical formula used. We show the activity multipliers applied to your BMR, cite peer-reviewed research where applicable, and clearly state the limitations of calorie estimation. No black boxes — you can verify our maths yourself.
Why We're Different
UK-friendly units
Enter weight in stones and pounds, height in feet and inches — just like at the GP surgery.
NHS-aligned guidance
Uses the NHS-recommended 600 kcal deficit and safe weight loss rate of 0.5–1 kg per week.
Evidence-based formulas
Uses the Mifflin-St Jeor equation, recommended by the Academy of Nutrition and Dietetics as the most accurate.
No sign-up required
Get instant, accurate results without creating an account or sharing personal data.
Our Values
Privacy First
We don't store your personal health data. All calculations happen in your browser — your weight, height, and age never leave your device.
Accuracy Matters
We use scientifically-validated formulas and clearly explain our calculations, including their known limitations and accuracy margins.
Accessible to All
Completely free, works on all devices, and designed for all abilities. No premium tiers, no paywalled features.
Health-Focused
We promote sustainable, healthy approaches to weight management. We will never recommend crash diets or unsafe calorie levels.
Important Disclaimer
CalorieCalculator.uk is not a substitute for professional medical advice. Our calculator provides estimates for educational purposes only. Individual calorie needs vary based on factors including medical conditions, medications, and metabolic adaptation.
If you have specific health conditions, are significantly overweight (BMI over 30), have an eating disorder, or have concerns about your diet, please consult your GP or a registered dietitian before making changes to your eating habits.
Have questions or feedback? Visit our contact page to get in touch.
Calculate your daily calories
Use our free UK calorie calculator to estimate your maintenance, weight loss, or muscle gain calories.
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