Food Logging Guides & Nutrition Calculators

How to track calories from a meal photoLearn how to photograph a meal, review the food recognition result, adjust portions and save estimated calories and macros with SnapCal for iPhone.

How to start a simple food diaryStart a food diary with photos, manual food search or meal copying. Review daily calories, protein, carbs, fat and weight trends with SnapCal for iPhone.

How accurate is AI photo calorie tracking?Understand the main sources of error in photo calorie estimates and how to review foods, portions, oils and sauces before saving.

How to track calories for fat lossBuild a calorie baseline with a food diary, follow trends and reduce missing entries. Learn why estimates need adjustment over time.

How to track protein intakeStart with food weight, nutrition labels and daily totals. Avoid confusing the weight of a food with grams of protein.

How to track macrosLearn a practical order for logging carbohydrates, protein and fat, common omissions, and how grams translate into calorie shares.

How to read your weight trendRecord weight under similar conditions and use a continuous trend rather than a single-day change to assess direction.

How to estimate calories when eating outUse menus, photos, portions and split entries to estimate restaurant meals, with special attention to oils, sauces, drinks and edible portions.

Photo logging vs manual loggingCompare photo recognition, manual search, quick calories and meal copying, then choose based on available information and speed.

Who SnapCal is forReview SnapCal’s use cases, limits, free plan and connectivity needs before deciding whether it fits your food logging routine.

Daily calorie needs calculatorEstimate adult daily energy requirements from age, height, weight and activity using the 2023 National Academies EER equations.

Macro calculatorEnter daily calories and percentage shares for carbohydrate, protein and fat to calculate grams. Inputs stay in your browser.

Food logging guides and nutrition calculators