iPhone Screenshots


The 40•30•30 App lets you quickly calculate the percentage of calories in a food from the three macronutrient groups: carbohydrates, protein, and fat.

Several popular diets recommend a 40%-30%-30% ratio of these macronutrients, but this can be a chore to figure out when reading a Nutrition Facts label. Using this app you can quickly enter the grams of carbohydrates, protein, and fat and instantly see the fraction of calories from each of these sources.

Of this app will work as well with any other balance of macronutrients, so you're by no means limited to a 40-30-30 program.

As always, consult your doctor before beginning any new diet.

Also please check out the full version of this app, 40•30•30+.

What’s New

Version 3.1

Updated UI fonts

Ratings and Reviews

4.6 out of 5
8 Ratings

8 Ratings

msgotrox ,

Great help for Zoners

Been using this for several months now and I really like it. It is such a huge help when grocery shopping or just experimenting in the kitchen. Very convenient & simple - three scoll wheels to enter or adjust grams of carbs, protein, fat & the ratio is displayed above. Helps me stay in the Zone more consistently. P.S. to Killroy: If you're regularly eating more than 49 grams of carbohydrates per meal, this app probably isn't for you anyway.

patsy907 ,

Only goes to 99g

Odd and inconvenient that it will only let you calculate up to 99g per category - not even enough for 1 day of food calculation

Fitmod33 ,

Reply to nonnie & gttc

I agree GTTC on the calculations but usually just use the Zone's base grams for snacks and multiply by 3 to get my meals. Thought I'd like to try this for individual items if that would help, but pkgd. foods make it hard and why I try to avoid them. I hope this works for my purposes. Glad to see it offered for free though, so thanks Frank. Nonnie, as far as your apps, the same thing was happening to mine. Go to ITunes help menu tab, select Ipod help and run through the troubleshooting diagnostics. Mine ended up being my music videos needed deselected and not resynced. Typically a problem with your other loaded items, ie music, photos, videos, mail. HTH! Good luck everyone with your healthy goals!


Laika Systems
13.3 MB
Health & Fitness

Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating
Rated 12+ for the following:
Infrequent/Mild Medical/Treatment Information
© 2008-2015 Laika Systems


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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