Calorie tracking,
reimagined by AI
Snap a photo of your meal and let Calvin do the rest. Instant nutrition insights powered by advanced AI.
Photo-First Logging
Just snap a photo. Our AI instantly recognizes your food and calculates accurate nutrition info.
AI-Powered Accuracy
Powered by advanced vision AI that understands portions, ingredients, and cooking methods.
Smart Insights
Track your progress with beautiful charts and personalized recommendations to reach your goals.
Unlock your full potential
Get unlimited AI photo scans, advanced insights, priority support, and more with Calvin Pro.
Free Nutrition Tools
TDEE Calculator
Calculate your daily calorie needs based on your goals
Macro Calculator
Get personalized macro splits for your diet
Body Fat Calculator
Estimate your body fat using measurements
Protein Calculator
Calculate optimal protein intake for muscle
Deficit Calculator
Find a safe calorie deficit for weight loss
Recipe Calculator
Get nutrition facts for any recipe
Food Calorie Database
Browse all foodsFrom the Blog
The Complete Guide to Calorie Counting
Master the fundamentals of calorie counting with our science-backed guide for weight loss, muscle building, or mindful eating.
What Is a Calorie Deficit?
A calorie deficit is required for fat loss—but how big should it be? Learn the science and how to set the right deficit.