Accurate Calorie Calculator

World’s Most Accurate Calorie Calculator

Whether your goal is to gain muscle or lose fat, this highly accurate and calibrated calorie calculator computes the optimal calorie intake and macro-nutrient values as well as generating a perfect meal for you with proper portion size to help you achieve your goal. Find out why this is the world’s most accurate calorie calculator.

Step 1: Enter Your Gender
Step 2: Enter Your Weight
Step 3: Enter Your Height
Step 4: Enter Your Age
Step 5: Enter Activity Level
Step 6: Select Your Goal
Step 7: Enter Meals Per Day
Step 8: Enter Research Model
Step 9: Current Bodyfat (click to estimate)
Step 10: Enter Calibration Factor calories/day
Step 11: Enter Macro Ratios auto-set

Step 12: Predicted Muscle Gain: (click to estimate)
Step 13: Click here —>

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Calories and Metabolic Rate

You Daily Calorie Requirements
Basal Metabolic Rate (BMR)
Daily calories to maintain weight (TDEE)
Daily calories based on goal in step 6

Projected Weight Loss



per week lbs kg
per month lbs kg
per year lbs kg

Your Protein Consumption: g/lb bodyweight (normal range 0.5-1.0 g/lb)

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A link to your complete meal plan will appear here after you enter all the information and click on the ‘Calculate’ button.

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Your Custom Meal

Nutrient values in each meal   Sample Meal Based On Your Nutritional Requirements
Number Meals
  Food Imperial Metric
Calories Per Meal calories   Grilled chicken breast

Protein grams   Steamed broccoli

calories   Steamed brown rice

Carbohydrates grams   Flax oil

calories   Quantities adjusted to meet your nutritional requirements!
Fat grams

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Hold Your Course!

Your scale weight can vary wildly from day to day based on the amount of salt you have consumed and other factors, don’t panic if your weight plummets one day then seems to be stalled or even increase the next – stay your course! If you do your eat as directed here and perform the amount of exercise you have set in step 5, then you will lose fat! To measure your progress, take your weight at the same time every day and measure your bodyfat. Measuring your bodyfat is very important to do if you are weight lifting in addition to losing fat because if you are gaining muscle and losing fat at the same time, the scale alone wont indicate your progress.

If you have trouble using this calculator, please watch this video which describes how to use it.

The World’s Most Accurate Calorie Calculator

“World’s Most Accurate” is quite a claim to make for my calorie calculator! Why is it justified? Basal Metabolic Rate (BMR) is what calorie calculators estimate. BMR is basically the rate your burns calories when resting. The gold standard for measuring BMR is a medical laboratory test where they measure the concentration of oxygen and carbon dioxide in your inhalation and your exhalation as well as the precise rate of breathing (liters per minute). From this they can calculate the rate at which oxygen is being converted into carbon dioxide, in other words, how fast your body is burning calories. Obviously, using this test is the most accurate way to calculate your BMR but I can’t afford it and I doubt you can either.

Research Models

All web based calorie calculators *estimate* your BMR based upon various research that has been done. These research studies have come up with various formulas that are used to estimate your calories. For example, two of the most commonly used equations come from the research done by Harris-Benedict in 1919 or Mifflin-St Jeor done in 1990. The Mifflin-St Jeor appears to be about 5% more accurate than the Harris-Benedict equations, this is probably because the older research was based upon a population that was much leaner and more active than we currently have. These equations based upon the research are easy to use but only get you to within about +/-10% accuracy on the caloric estimation which is accurate enough for most uses given the difficulty of counting the calories accurately. The reason for the +/-10% variation is twofold. First, because these equations use weight and not lean body mass in their calculations. The energy required to maintain muscle is higher than the energy required to maintain fat so both these equations will be off for either very lean or very fat people. To get around this problem there are two more sets of equations based upon the research by Katch-McArdle and Cunningham which are based upon Lean Body Mass (LBM) instead of weight. Everything has flaws and the Cunningham and Katch-McArdle equations do to. Their flaw is that they completley disregard the energy required to maintain the bodyfat so they are not accurate for untrained obese people. Whose equations should you use for best accuracy? If you are fairly muscular and lean (4-pack abs or better), I would recommend the Katch-McArdle formula. If you are just starting on your fitness journey and are not yet strong or lean then I recommend the Mifflin-St Jeor equation. For those who want to know, here are the equations for men:

Researchers Gender Equation
Harris-Benedict   male 66 + 13.7*Weight + 5*Height – 6.8*Age
Harris-Benedict female 655 + 9.6*Weight + 1.8*Height – 4.7*Age
Mifflin-St Jeor male 9.99*Weight + 6.25*Height – 4.92*Age + 5
Mifflin-St Jeor female 9.99*Weight + 6.25*Height – 4.92*Age -161
Katch-McArdle N/A 370 + 21.6*LBM
Cunningham N/A 500 + 22*LBM
Note: All weights in kilograms and heights in centimeters

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Calibration to increase Research Model Accuracy

So back to the question, if all web calorie calculators out there use the same sets of equations, how can I claim to be the most accurate? Two reasons. First most web based calorie calculators out there are based upon the Harris-Benedict equations and Mifflin-St Jeor equations that use weight, not LBM (Lean Body Mass) for their calculations. Secondly, because of an innovative new procedure I came up with to allow you to calibrate the calculator for your own, individual metabolism. After you have done the calibration, its very easy for you to approach the accuracy that you would get in a medical laboratory. The calibration procedure takes a month and I wont lie, its a lot of work. For most people, just using the equations that get you within 10% are close enough and its not worth the bother to calibrate. For serious bodybuilders though, having this accurate information is critical. Since serious bodybuilders are already methodically taking all the data required for this calibration, its not much work for them at all and the gain in accuracy makes a huge difference.

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About The Activity Level

You might have had questions about what “Activity Level” to set, you are not alone. This chart maps the activity factor with the descriptions. My experience of making over 2.5 million meal plans has shown me that if you use the guidance given by the standard descriptions listed in the “alternate description” column you will never lose any fat which is why my calculator uses the term “strenuous cardio”. Most people who “cant lose fat” are overestimating their weekly cardio time. Only strenuous cardio counts, things like jogging, biking up mountains, swimming, etc. Walking is great exercise but it does not count toward the hourly total nor does lifting weights – I assume you do these things. To count as strenuous cardio, it needs to be above 65% of your maximum heart rate for the entire exercise duration. This is especially important to monitor if you are using stationary cardio equipment where its easy to slack off

Multiplier    My Description Alternate Description
1.2 Desk job with little exercise Little to no exercise
1.375 1-3 hrs/wk strenuous cardio Light exercise (1–3 days per week)
1.55 3-5 hrs/wk strenuous cardio Moderate exercise (3–5 days per week)
1.725 5-6 hrs/wk strenuous cardio Heavy exercise (6–7 days per week)
1.9 7-21 hrs/wk strenuous cardio Very heavy exercise (twice per day, extra heavy workouts)

Web Developers and Fitness Professionals

Like everything on, this calculator is completely free to individuals wanting to improve their health and fitness. Lots of websites have calorie calculators that you have to pay to use but my free calculator here is even better! If this is not the best calorie calculator you have ever used, please contact me via facebook and let me know how I can make it the best calorie calculator anywhere on the internet – free or not! My goal is to provide information so that the poorest teen can get the information they need to build a great physique. The information available on this website for free is just as good as all those expensive books, just not quite as polished – but its free! 🙂

Your website or business can easily incorporate these calorie calculators and meal planning tools!

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