Sources & methods

Every number in these calculators comes from somewhere you can check. We use primary sources first — regulations, government food-safety guidance, university extension publications and published, tested recipes — and we store recipes as their source's own weights, so the results trace straight back.

Where no tested figure exists, we say so and leave the field for your recipe rather than invent one. Links are checked automatically every month, and each source shows when we last confirmed it says what we use.

Government guidance and data

University extension

Research and reference

Standards

Manufacturers

Recipes and baking references