About HowManyOunces

HowManyOunces is a reference for kitchen, weight and volume conversions. Each page answers one question, such as how many ounces are in a cup, and backs the answer with a converter, a chart and a short explanation.

The site is written for home cooks and bakers in the United States and the United Kingdom, and for anyone who needs a quick, exact conversion. US and UK units are shown side by side wherever they differ.

Every unit on the site comes from one registry of exact definitions from NIST Handbook 44, the US reference for weights and measures. Conversions are calculated with exact fractions and rounded only when they are shown, so a pound is always exactly 453.59237 grams.

Ingredient weights, such as how much a cup of flour weighs, come only from USDA FoodData Central. Each ingredient page lists the FoodData Central ID of the record it uses. If USDA has no measurement for an ingredient, we do not publish one.

The full rules, including rounding and kitchen fractions, are on the methodology page.

The site is written and maintained by the HowManyOunces editorial team. We do not use invented authors, reviews or expert quotes. Pages about health topics, such as daily water intake, repeat what the cited public health sources say and link to them.

Before any update goes live, automated tests check every conversion factor against its definition, every chart and every number in the text. Each page shows the date its data was last reviewed.

If you find a mistake, please report it. Corrections are listed in the change log on the methodology page.

The site is free to use. It may show ads from Google AdSense, clearly labeled as advertisements. Advertisers have no say over the content, and no page is paid for or sponsored.