This calculator adds up the calories (and, optionally, the protein/carbs/fat) of every food item on your plate so you get one meal total instead of adding numbers by hand. It's built for quick plate-level math, not for replacing a full food-tracking app.
How the calculation works
Each food item you add contributes its entered calorie value directly to the meal total — the calculator simply sums them, with no per-item rounding or adjustment. If you also enter protein, carbs, or fat in grams for an item, those are summed separately and converted to a calorie figure using the Atwater factors (4 kcal/g for protein and carbohydrate, 9 kcal/g for fat) — the same factors used on US nutrition labels and by USDA FoodData Central. Any negative value is treated as 0, since a food item cannot contribute negative calories or negative grams of a macronutrient.
Inputs and what they mean
Each row accepts a food name (for readability only — it does not affect the math), a required calorie value, and three optional macro fields in grams. You can add up to 20 items. The Daily View tab adds one more input, meals per day (1–12), which multiplies the meal total to estimate a full day — it assumes every meal resembles the one you built, so it is best used for quick planning rather than logging an actual varied day.
Limits and edge cases
This tool does not look up calorie counts for you — it only sums numbers you provide, so its accuracy depends entirely on how closely your entries match the actual food (packaging labels, a USDA database lookup, or a restaurant's published nutrition information are all better sources for the per-item numbers). It does not track alcohol calories (7 kcal/g), fiber's partial calorie contribution, or micronutrients. For medical nutrition needs — diabetes management, eating disorder recovery, pregnancy, or a clinician-prescribed diet — work with a registered dietitian or physician instead of relying on this estimate.