Does calorie tracking feel like a chore?

Eliminate the burden with the app that senses your eating and reliably estimates your calories for you!

Calorie counting has always been hard to stick with and highly prone to error due to the huge burden of journaling everything we eat and correctly estimating portion sizes. Lumme’ s AI-powered kCalculator app downloads to your Apple Watch and works like a step-tracker for eating – passively detecting eating from your hand motions and eliminating the burden of food journaling using proven algorithms to estimate your calories.

Lumme Health - kCalculator App - Logo
Lumme Health - kCalculator App - Calorie Estimates

Calorie Estimates

It turns out that the major driver of your daily calories comes down to your portion sizes – simply HOW MUCH YOU EATkCalculator measures this volume of food from your bites, which is a personalized and fixed portion size of food.  Bite-based estimates are scientifically validated and begin with an objective caloric proxy for your bites according to various profile details, including your sex, age, height and current weight.

The vast majority of variance in energy density associated with WHAT YOU EAT can be captured with one simple question regarding your ‘Meal Type’.  What you get is a high-quality and reliable calorie estimate with minimal effort.  Keep in mind that your food choices will always impact your health and your calories.

Eating Detection Notifications

Similar to other apps that detect a particular activity, kCalculator senses when you’re eating and will ask for confirmation on your smartwatch. This automates the creation of a meal record. You should otherwise eat normally, with your hands or utensils (fork/spoon).

Just keep in mind that only the bites consumed with your hand wearing the smartwatch will be registered.

Lumme Health - kCalculator App - Eating Detection Notifications
Lumme Health - kCalculator App - Meal Type Selection

Meal Type Selection

Selecting an appropriate Meal Type will capture the vast majority of the variability in calories associated with what you eat.

For simplicity, kCalculator defaults to the Mix of High and Low Calorie Food meal type.

If you’re eating mainly Low Calorie Foods (salad, fish, fruit, vegetables) or High Calorie Foods (burgers, pizza, sweets), use the simple slider to select these alternative options.


Beverages can range from zero calories (water) to hundreds of calories (meal replacement shakes). If you consume caloric beverages such as sugary drinks, smoothies, alcoholic beverages or meal replacement shakes, your meal diary provides a very simple way to add these calories.

Lumme Health - kCalculator App - Beverages
Lumme Health - kCalculator App - Improving Detection Accuracy

Improving Detection Accuracy

The kCalculator sensing ability will naturally improve over time based on your responses to eating detection notifications.

To speed up this process, the app may suggest using the ‘Training Session’ function to learn your unique eating gestures.

Unlock Your Potential

Lumme Health - kCalculator App - Unlock Your Potential

A wealth of information that you can use to understand and improve your eating patterns is waiting to be unlocked. All it takes is wearing your smartwatch on the hand that you use for eating. It may feel strange at first, but most people get used to it quickly.

Put on your watch and unlock your potential today!

Still have questions?

Visit our FAQ page and find out more about the Lumme Health Quit Smoking App

Sign up for Early Access to the kCalculator and Weight Loss app today!

Please let us know which smartwatch and smartphone model you use.


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