BMR Calculator
Estimate your Basal Metabolic Rate — the calories your body burns at complete rest — using the Mifflin–St Jeor equation.
Open calculator →Free Calorie Calculators & Nutrition Tools You Can Actually Trust
Evidence-based calculators for TDEE, BMR, calorie deficit, macros and body metrics — plus restaurant-specific tools that estimate calories for real UK menu items.
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Popular Calorie & Nutrition Calculators
Every tool runs instantly in your browser, explains what the result means, and links to the next logical step — whether that's setting a calorie target or checking your macros.
TDEE Calculator
Calculate your Total Daily Energy Expenditure — how many calories you actually burn per day including activity — to set an accurate calorie target.
Open calculator →Calorie Deficit Calculator
Work out exactly how many calories to eat to lose or gain weight at a safe, sustainable rate, based on your own stats and timeframe.
Open calculator →Macro Calculator
Turn your daily calorie target into a practical protein, carbohydrate and fat split based on your body weight and goal.
Open calculator →BMI Calculator
Calculate your Body Mass Index using standard WHO classification bands, with an explanation of what BMI can and cannot tell you.
Open calculator →Toby Carvery Calorie Calculator
Build your actual carvery plate — meats, potatoes, veg, gravy and all — and see a live calorie and nutrition total before you sit down.
Open calculator →Wetherspoons Calorie Calculator
Build a full Wetherspoons order — mains, sides, dessert and drinks — and see calories, macros and salt add up in real time.
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Methodology
Built on Published Formulas, Not Guesswork
Every calculator on Calorie Check is built around a named, peer-reviewed or widely validated method — not an internal black-box formula. Our BMR and TDEE tools use the Mifflin–St Jeor equation, generally recognised in clinical and sports-nutrition literature as more accurate across a wider range of body types than older formulas like Harris-Benedict. Our BMI tool uses the standard WHO classification bands. Our restaurant calculators are built the same way every nutrition label is: by summing verified per-item values as you add them to a basket.
We show our working. Every calculator page explains the formula used, states its assumptions plainly, and tells you when a result should be treated as a rough guide rather than a precise number — because that's the honest answer for anything based on population averages.
None of this replaces individual medical or dietetic advice. Bodies vary, and formulas built on averages will always be a starting estimate rather than a diagnosis. Where a result carries extra uncertainty — like a very aggressive calorie deficit — the calculator tells you so, rather than silently returning a number that could be unsafe to follow.
Read our full editorial methodologyNamed formulas
Mifflin–St Jeor for BMR/TDEE, WHO bands for BMI, standard g/kg protein targets for macros — never a hidden proprietary formula.
Clear assumptions
Every result page states what the number does and doesn't account for, so you can judge how much to rely on it.
Safety checks built in
Deficit and surplus targets are flagged automatically if they fall outside commonly recommended, sustainable ranges.
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Find the Right Tool for Your Goal
Weight Loss & Energy Needs
Work out your maintenance calories (TDEE), set a safe calorie deficit, and understand exactly how your daily intake connects to the number on the scale.
Macros & Muscle
Turn a calorie target into a practical protein, carb and fat split based on your body weight and training goal.
Eating Out
Build your actual plate — roast meats, sides, sauces and all — and see a live nutrition label before you sit down.
Guides
Latest Nutrition Guides
Understanding Macros: Protein, Carbs and Fat Explained
What each macronutrient actually does in your body, how much you need, and why the split matters even when total…
Read article →Calorie Deficit for Weight Loss: The Complete Guide
How big should your deficit be, how fast should you expect to lose weight, and why does progress stall? A…
Read article →How Many Calories Are in a Toby Carvery? Full Breakdown
From the meat you choose to how many scoops of veg you take, here is a full, honest breakdown of…
Read article →Common Questions
Are these calorie calculators free to use?
Yes. Every calculator is completely free, runs directly in your browser, and does not require an account or email address.
How accurate are the results?
Our calculators use established, published formulas (such as Mifflin–St Jeor for BMR/TDEE and WHO bands for BMI). They provide reliable estimates based on population data, but individual metabolism, medical conditions and body composition can shift real-world numbers. Treat results as an informed starting point, not a diagnosis.
Do you store any of my personal data?
No. Calculations run entirely in your browser using JavaScript. Your age, weight, height and other inputs are never sent to or stored on our servers. See our Privacy Policy for full details.
Are the restaurant calculators affiliated with the restaurants themselves?
No. Our restaurant-specific calculators are independently built using publicly available and estimated nutrition data for general guidance. They are not affiliated with, endorsed by, or sponsored by the restaurant brands referenced. Always check official in-venue or app-based nutrition information before making decisions related to allergies or medical conditions.