How to

5 of the Best Macro Calculator Apps

macro calculator apps

Looking for some good calculator apps to figure out your macronutrient ratios? (see how to count macros for fat loss or muscle gain here).

After trying dozens of these online macro calculator apps it became clear that VERY FEW are original. Many of them have simply been copied from other websites.

The following macro calculator applications appear to be some of the originals – carefully designed and coded:

Top Five Macro Calculator Apps (web-based)

1. HealthyEater Macro Calculator

It would be silly not to mention our own calculator. Designed to be very simple to use – but still provide the most accurate results. It’s also highly optimized for mobile phones.

See the calculator…

2. Muscle For Life

Muscle for life has a macro calculator based on body fat percentage. This calculator has a lot more tweaking involved – in that you can alter most variables.

See the calculator…

3. IIFYM Calculator

The macro calculator at IIFYM is powerful and complex, having multiple variables that can be tweaked. However, you will need to enter your email address to get any results sent to you.

See the calculator…

4. Freedieting Nutrient Calculator

This calculator will calculate macronutrients per day or meal based on various diet regimes. You will need to enter a daily calorie amount.

See the calculator…

5. Bodybuilding Macro Calculator

From one of the most popular bodybuilding sites comes this calculator. And it’s surprisingly basic – only offering the simplest of results.

See the calculator…

Wait… Aren’t There Hundreds More?

We looked at so many calculators, and many are simply copies of other calculators (some used with permission, some ripped off from other sites).

Why are results different even though I enter the same stats?

When using different macro calculator apps you may have noticed that the results can vary between them. This is because formulas have been tweaked slightly – often due to real feedback from macro coaching clients.

Here are more details to help you make sense of the discrepancies between macro calculator apps.

There are a few standard formulas for calculating estimated BMR, REE, and TDEE. Some calculator apps use one formula, some use others, and some let you choose. But, it’s important to keep in mind that ALL formulas are providing an ESTIMATION of your BMR, REE, and TDEE. Therefore even though the results are different, they are still putting you in the ballpark of levels that should allow you to see results.

Some calculators also have different “default settings” so when you enter your details they are defaulting with different activity multipliers, macro percentages, and other variables.

If you want a more precise calculation, you can have metabolic testing done by a certified testing facility. This can be expensive and isn’t often covered by insurance, however, it is the most accurate way to determine your personal BMR, REE, and TDEE.

Rest assured, most people can use estimations to accomplish their fitness goals without the need for costly metabolic testing. If none of the macro calculator app formulas are working for you, despite giving it adequate time, then it may be a good idea to undergo metabolic testing to see what’s happening with your body metabolically. You could also have a metabolic panel blood test performed in order to look for other reasons your metabolism may not be as active as it should be,

Ted Kallmyer is an ISSA certified Specialist in Fitness Nutrition, is an expert macros coach, and the author of The Macro Solution. If you need personal help reaching your weight loss/fitness goals see his nutrition & macros coaching options. Follow Ted on Instagram
Last Updated: October 10, 2019


  1. Maryann Allen

    What calculator and how to use for keto