Food tracking and nutrition guides
A meal photo is a starting point for understanding food. These guides show you how to check a portion, read the numbers and keep a record that is useful the next time you eat a similar meal.
Choose your starting point
Start with the photo guide if you want a quick estimate. Choose the homemade-meals worksheet when you know the ingredients. The calories-versus-macros guide explains the numbers, and the photo-log guide turns occasional scans into a repeatable routine.
How to Estimate Calories From a Food Photo
Estimate calories from a food photo with three checks: food identity, portion size and hidden extras. See a worked label example and what AI can miss.
Read the guide →NutritionCalories vs Macros: How to Read Your Meal Numbers
Understand calories, protein, carbs and fat with a worked meal example, a grams-to-calories table, and tips for reading a food scan.
Read the guide →NutritionHow to Track Calories in Homemade Meals
Use an ingredient worksheet and a batch-to-portion calculation to estimate homemade meal calories, including mixed recipes and leftovers.
Read the guide →NutritionHow to Keep a Food Photo Log You Can Actually Use
Try a simple seven-day food photo log with a daily checklist, a weekly review template, and practical ways to record portions and context.
Read the guide →NutritionHow to Take Food Photos for Better Calorie Estimates
Use a simple food-photo checklist to show portions, ingredients and scale more clearly before reviewing an AI calorie and macro estimate.
Read the guide →NutritionAI Calorie Scanner vs Food Diary: Which Should You Use?
Compare a photo-based AI calorie scanner with manual food logging by speed, portion detail, recipe accuracy and the kind of record each method creates.
Read the guide →NutritionHow to Estimate Portion Size From a Food Photo
Learn what a meal photo can reveal about portion size, what remains uncertain, and how to add plate, label and recipe context before using an estimate.
Read the guide →NutritionPhoto Calorie Scanner App: Pre-Save Checklist
Use this photo calorie scanner checklist to review food identity, portion assumptions and hidden ingredients before saving estimated calories and macros.
Read the guide →NutritionHow to Estimate Restaurant Calories: 5 Practical Checks
Use menu nutrition, portion checks and a worked example to estimate restaurant meal calories. See where a food photo helps and what to review in NutriLens.
Read the guide →Put it into practice with NutriLens
NutriLens analyzes meal photos and provides estimated calories and macronutrients. Check the identified food and portion before using a result. Hidden ingredients and cooking methods can change the estimate.
Get NutriLens.
Scan a meal. Explore estimated calories and macros.
Free to download · iPhone, iPad & Android · Optional in-app purchases