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Each food is tied to a specific USDA FoodData Central record and retrieval date.
Protein data, made usable
Choose a food and protein target. See the approximate portion, calories, and underlying USDA data.
Protein Portion Calculator
Convert a protein target you choose into an approximate amount of one specified food.
Your selected target
≈4.7 oz · ≈140 kcal
Chicken breast, boneless, skinless, raw
Source: USDA FoodData Central · FDC ID 2646170 · retrieved 2026-08-14
Approximate value. Calculated from the selected USDA FoodData Central record. Actual nutrition varies by product, preparation, and serving.
30 g comparison
Why trust the numbers?
Each food is tied to a specific USDA FoodData Central record and retrieval date.
Portions use one clear formula, with the unrounded calculation available in the tool.
Records state raw, fat level, or preparation details rather than silently combining foods.