Gmstocups is a free kitchen conversion site for home bakers and cooks. We turn grams into cups, cups into grams, and spoons, ounces and milliliters into each other. Every page is built to answer one question fast, then show the chart and the source behind it.
Most recipes outside the US list ingredients in grams, while most US kitchens use cups and spoons. A cup of flour and a cup of sugar do not weigh the same, so one simple number does not work for every ingredient. We built Gmstocups so you can convert any amount with the right weight for the right ingredient.
Gmstocups is owned and run by Dmitry Chistov. Dmitry oversees the content, the calculators and the data behind every page.
We do not guess at conversions. Each ingredient weight on this site comes from a trusted, public source, and each page links to the sources it uses. Our main sources are listed below.
| Source | What we use it for |
|---|---|
| King Arthur Baking Ingredient Weight Chart | Grams per cup for flour, sugar, butter and most baking ingredients |
| USDA FoodData Central | Food weights and nutrition data, such as milk and oils |
| NIST Special Publication 811 | Exact sizes of the US cup, tablespoon, teaspoon, ounce and pound |
| FDA household measure guidance | How food labels round cups and spoons to milliliters |
| University cooperative extensions | Cooking methods, swaps and food safety tips |
All of our pages and calculators use one master table of ingredient weights. When a value changes in the master table, it changes everywhere on the site. That way, the flour page, the calculator and the homepage never give you two different answers.
We write in plain language so any home cook can follow along. Every page shows the date it was last updated and lists its sources at the bottom. When two trusted sources disagree, we show both numbers and explain the gap instead of hiding it.
We want every number on this site to be right. If you spot an error or think a value should be checked, please email us at gmstocups@gmail.com. We read every message and fix confirmed errors as soon as we can.