How FOOGG calculates recipe changes
FOOGG is deliberately simple where the math is reliable and deliberately cautious where cooking introduces uncertainty.
Proportional scaling
Serving, ingredient-limit and package calculations use direct ratios. If you have 327 g when a recipe calls for 500 g, the factor is 327 ÷ 500 = 0.654. Recognized leading ingredient quantities are multiplied by 0.654.
Recognized quantities
The browser parser recognizes leading whole numbers, decimals (including decimal commas), common fractions, mixed fractions such as 1 1/2 or 1-1/2, Unicode fractions such as ½, numeric ranges, and common copied-list bullets. It intentionally does not scale later numbers on the same line because those may describe package size, fat percentage or another property rather than the amount to multiply.
Pan capacity
Rectangle/square area is width × length. Round area is π × radius². When both pan depths are entered, FOOGG uses a simple area × pan-depth comparison as an approximate capacity ratio. Otherwise it uses bottom surface area only. Pan wall depth is not the same as actual batter depth, so the result is a planning approximation.
Baking-time guidance
FOOGG does not calculate a supposedly exact finish time. When batter is scaled toward a similar fill depth, it suggests beginning to check a few minutes before the original time. When the full original batch is moved to a substantially larger pan, it suggests checking earlier; when moved to a substantially smaller pan, it warns that the bake may take longer and that overflow is possible. This direction is consistent with King Arthur Baking's published guidance that larger pans tend to make a shallower, faster bake while smaller pans can require more time.
Food safety
PanFit is not a food-safety calculator. For foods where safe internal temperature matters, use an appropriate food thermometer and authoritative food-safety guidance rather than visual doneness alone.
Recipe consistency checker
The checker is deterministic and browser-local. It uses normalized ingredient tokens plus a short common-ingredient vocabulary. It can miss synonyms and can flag false positives, which is why results are presented as possible issues to review rather than corrections.
Data and external services
The current production calculators do not require third-party recipe, nutrition or AI APIs. This avoids licensing ambiguity and keeps pasted recipe text on the user's device.
Reference guidance
- King Arthur Baking: Why the size of your baking pan matters so much — pan volume, fill and timing considerations.
- King Arthur Baking: The essential alternative baking pan sizes — area-based pan comparisons.
- USDA FSIS: Food Thermometers — food-safety distinction between doneness and safe internal temperature.
Last reviewed: September 15, 2026.