About Kitchen Unit Calc
Kitchen Unit Calc is a set of free converters for cooks and bakers: grams to cups by ingredient, grams to ounces, millilitres to fluid ounces, cups to millilitres, spoons to grams, butter, oven temperatures and recipe scaling. It is published by AUSSIE-AI LTD, a small UK company. Nobody here claims to be a chef or a food scientist. What the site offers is published figures, applied carefully and shown in full.
Where the numbers come from
Ingredient weights. Each of the 44 ingredients has a weight per US cup taken from one or both of these:
- USDA FoodData Central, SR Legacy release, which lists household measures ("1 cup", "1 tbsp", "1 stick") with their weight in grams for each food.
- King Arthur Baking's ingredient weight chart, written for home bakers, which states that a cup of flour is fluffed, spooned in and levelled.
Each entry records the figure exactly as the source prints it ("1/4 cup = 28 g"), so anyone can check it against the original. The grams to cups page lists every ingredient with both figures and links to each USDA record.
Choosing between sources. Where the two disagree, the converters use King Arthur's figure for flours, starches, sugars, cocoa, oats and chocolate chips, because King Arthur says how the cup was filled and that method matches most US recipes. For liquids, oils, syrups, dairy, nuts, salt and leaveners they use USDA's figure, because King Arthur rounds many of those to whole ounces. Butter uses King Arthur's 113 g per half cup so that a stick reads 113 g, the weight both sources give for a stick. When only one source lists an ingredient, the page says so.
Unit sizes. The US cup, tablespoon, teaspoon, fluid ounce, pint, quart, gallon, ounce and pound are the exact definitions in NIST Handbook 44, Appendix C. The imperial pint, gallon and fluid ounce come from the UK Weights and Measures Act 1985. The 240 mL "legal" cup is the US nutrition labelling rule in 21 CFR 101.9. The 250 mL metric cup and the 20 mL Australian tablespoon follow the national definitions summarised in Wikipedia's articles on those units.
How the numbers are checked
Before any change goes live, the site's tests run every converter against a file of expected answers worked out separately from the unit definitions, and round-trip every ingredient (grams to cups and back) to confirm nothing drifts. A second program, written separately in a different language, recomputes several hundred conversions from the same definitions and has to agree with the site's engine. A browser test then types into every converter on a phone-sized and a desktop-sized screen. If any check fails, the change does not ship.
What the converters can't know
- How you fill your cup. A packed cup of flour can weigh a third more than a spooned and levelled one.
- Brand differences. Two brands of cocoa or chocolate chips can weigh differently per cup.
- What the recipe's author meant. If a recipe gives its own gram figures, use those.
Money
The site carries advertising to pay for itself. No company named on the site, including King Arthur Baking, has paid for a mention or has any connection with us. Their names appear only to show where a figure comes from.
Corrections
If a figure looks wrong, send the ingredient, the figure you expected and where it comes from through the contact page. We check it against the source and correct the site if we got it wrong.
Who runs it
Kitchen Unit Calc is published by AUSSIE-AI LTD, a company registered in England and Wales (company number 17193460). Questions and corrections go through the contact page or to hello@kitchenunitcalc.com.