Copy the numbers from a food label to estimate amounts per serving or per package. Add a second product and serving weights to compare at the same 100 g basis.
Start with the label column
This tool is designed around US Nutrition Facts serving information. The FDA explains that values usually describe one serving, while some labels also show a whole-package column. Serving size describes typical consumption; it is not a recommendation for how much you should eat. Read the FDA serving-size guide ↗
Choose the column you are copying. If you copy a whole-package amount, the tool divides it by the serving count. It does not multiply it again. Keep grams and milligrams separate, and compare foods in the same dry or prepared state.
Entries stay in this page; the tool does not send them to a server. Printing can include your entries, so check the preview before saving or sharing.
The formulas, without a calculator
Whole-package amount = amount per serving × servings per package.
Amount per serving = whole-package amount ÷ servings per package.
Amount per 100 g = amount per serving ÷ serving weight in g × 100.
Your portion amount = amount per serving ÷ serving weight in g × your portion weight in g.
For a fictional snack with 120 mg sodium per 25 g serving and 3 servings per package: the package estimate is 360 mg, the 100 g estimate is 480 mg, and a 50 g portion is 240 mg. These are invented practice numbers.
Print a label-checking worksheet
Use the print button above for a paper copy, or copy these original prompts. Leave unknown information blank.
My two-product label check · date: __________
Check before comparing
Product A
Product B
Product name and label date
__________
__________
Column copied: per serving or package
__________
__________
Servings per package
__________
__________
Weight of one serving, g
__________
__________
Nutrient name, value and unit
__________
__________
Dry or prepared state
__________
__________
Amount I plan to use, g
__________
__________
What is missing or approximate?
__________
__________
What the result can tell you
The results rescale the numbers you entered. They do not measure the food, determine a safe intake, rank overall nutrition, or give individual dietary advice. Rounded or approximate labels remain approximate after calculation. Added ingredients, draining or preparation can change the basis. When a whole-package label is available, check it directly; it may differ from multiplication of rounded serving values.