LUMME kCalculator is an A.I. tool that you can personalize to your unique eating gestures to simplify meal tracking and calorie counting. Use with Apple Watch 4/5/6/7/SE.

Journaling everything you eat for a calorie number can be a tedious chore that too often uses up the limited energy available for behavior change. Through machine learning, you can unlock a remarkably more efficient system for calorie tracking that saves you time and alleviates the burden of manual tracking. Follow the simple guidelines to train your Apple Watch to passively detect your eating and watch your detection accuracy and calorie estimates improve with each successive day of use.


Traditional calorie counting dictates that you look up everything that you eat and correctly estimate the portion size of each food item. It’s an exercise that’s difficult to stick to, and portion size estimation is highly prone to error.

Here's the secret. Of course, WHAT YOU EAT will always matter to good health, but the math on calories depends a lot on portion sizes – simply HOW MUCH YOU EAT. That's something the kCalculator measures in the form of a bite. By solving for volume first, adjusting for what you eat is surprisingly simple and effective!

• Syncs with your Apple Watch and operates in the background.
• Grows smarter by learning your gestures to passively detect eating.
• Eliminates food lookups.
• Eliminates measuring portion sizes.
• Accommodates eating with a fork, spoon or your hands.
• Automates daily calories using proven bite-based estimates.
• Automates meal diary records with time, duration and eating pace.
• Refines estimates with a simple ‘Calorie Type’ slider.
• Enables reliable long-term calorie tracking for weight management.
• Helps identify problem areas in your eating habits.
• Teaches new skills with the Mindful Eating program.
• FREE Guide: What You Need to Know About Counting Calories to Lose Weight
• FREE Download Exclusively for Apple Watch Series 4/5/6/7/SE


Once you’ve started to personalize your app to your unique gestures by verifying your eating detections and validating your meal diary entries, you’ll see your detections become more accurate as well as your calorie estimates.

We recommend comparing estimates to your best measurement techniques, such as weighing individual food items and looking up their energy composition. This can be cumbersome and impractical, but miscalculating portion size is the easiest thing to get wrong.

The app learns from all of your inputs and adjustments, so once it’s dialed-in to your liking, you can rely on it for accurate calorie tracking.


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.


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


Imagine what just 2 weeks of eating behavior data could do to reshape months and years to come. We’ll show you in the upcoming Predictive Behavioral app. It turns your Apple Watch into a full-time, uber-intelligent, weight management companion designed only to ensure your success.

kCalculator for Apple Watch is Exclusively for Series 4/5/6/7/SE
Make the Most of Your Apple Watch Today!

What’s New

Version 1.4.8

Bug fixes, improved onboarding, optimized data transfers, plus new features:
- Find Missing Meals to locate 'missed' eating events
- Eating detection sensitivity levers for improved detection
- Calorie editing on individual meals

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating

App Privacy

The developer, Lumme, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

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

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