How do I weigh bone-in food for calorie tracking?

Use weights from the same food state. Weigh the cooked food before eating, retain the bones and other inedible leftovers, then subtract their cooked weight. Match the result with nutrition data for the cooked edible portion.

Does USDA FoodData Central include bones in its portion weights?

FoodData Central Foundation Foods documentation says reported portion weights and nutrient values are based on edible material without refuse, such as a chicken leg without the bone.

Can I subtract cooked bones from a raw food weight?

Do not mix raw starting weight with cooked leftovers. Cooking changes weight. Use cooked food and cooked leftovers with a cooked edible nutrition entry, or separate and weigh the raw edible portion before cooking.

Edible Portion Calculator for Bone-In Food

Use before and after weights in the same state

Weigh the cooked bone-in or shell-on food before eating. Keep the inedible parts on the same tared plate, then weigh them after eating. Subtract the second number from the first.

Match the result to edible-portion nutrition

The subtraction gives a cooked edible amount only when both measurements describe the cooked food. Use a nutrition entry that also says cooked and edible portion, meat and skin, meat only, or another description matching what you ate.

Example: 300g served, 90g left

The amount removed is 210g and the measured edible yield is 70%. If the matching cooked edible entry lists 250 calories per 100g, the scaled estimate is 525 calories.

Read the bone-in food weighing guide for wings, ribs, shellfish, fruit pits, label wording, and the raw-versus-cooked trap.

What counts as refuse

Refuse is the part of a purchased weight you do not eat, and food databases usually express it as a percentage of the as-purchased weight. Bones, shells, rinds, peels, cores, stones, shrimp heads and the liquid in a tin are all refuse.

The proportion is often larger than people expect, which is why applying an edible-portion nutrition value to a bone-in or shell-on purchase weight overstates the food substantially. A whole fish, a bone-in chop and unshelled prawns all lose a large share of their purchase weight before anything reaches the plate.

Usually there is a simpler route

If you can weigh the edible part directly, do that instead and skip this calculation. Weighing the meat off the bone after eating, or the flesh after peeling, gives a real measurement rather than an estimate built on a yield percentage.

This tool is for the cases where that is not possible: a bone-in cut cooked and served whole, a purchase weight recorded before preparation, or a database entry that gives an as-purchased figure when you only have the edible weight. The bone-in weighing guide covers the practical version, including weighing the bones afterwards and subtracting.

The scale cannot identify what left the plate

Anything missing from the final plate contributes to the difference. That includes food eaten, sauce transferred elsewhere, crumbs, juices, and discarded edible pieces. Keep the setup simple and treat the result as an estimate when the leftovers are messy.