Cooking Converter Widget

A kitchen converter that knows the difference between a US cup, a metric cup and an old UK cup, and between a cup of flour and a cup of sugar. Volume-to-volume and weight-to-weight work for anything; volume-to-weight uses a published grams-per-cup figure for the chosen ingredient.

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<iframe src="https://a2z.tools/embed/w/cooking-converter" title="Cooking Converter by A2Z Tools" width="100%" height="520" style="border:0;width:100%" loading="lazy" allow="clipboard-write"></iframe>

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How it works

Kitchen volumes come from NIST's conversion factors: a US cup is 236.588 ml, a US tablespoon a sixteenth of that (14.79 ml) and a US teaspoon a third of a tablespoon (4.93 ml). The metric cup is 250 ml with 15 ml and 5 ml spoons, and the old UK imperial cup is ten imperial fluid ounces, 284.13 ml. Weights use the avoirdupois ounce (28.35 g) and pound (453.59 g). Converting between volume and weight needs a density, so the widget asks for an ingredient. Dry goods use the King Arthur Baking ingredient weight chart - 1 cup of all-purpose flour is 120 g, granulated sugar 198 g, packed brown sugar 213 g, table salt 18 g per tablespoon. Liquids use USDA FoodData Central portions: whole milk 244 g a cup, heavy cream 238 g, plain yogurt 245 g, water 1 g per ml. So 2 cups of sugar is 396 g and 240 g of flour is 2 cups. Without an ingredient, a volume-to-weight request is refused rather than guessed. The swap button reverses the direction.

Method

  • Volume to volume: value x ml per from-unit / ml per to-unit
  • Weight to weight: value x g per from-unit / g per to-unit
  • Density (g/ml) = ingredient grams per US cup / 236.588
  • Volume to weight: ml x density; weight to volume: g / density
  • US cup 236.588 ml; tbsp = cup/16; tsp = cup/48; UK cup 284.131 ml; metric cup 250 ml; oz 28.3495 g; lb 453.592 g

Worked examples

Flour to grams

Inputs: 1 US cup all-purpose flour

Result: 120 g

King Arthur chart value.

Sugar for a cake

Inputs: 2 US cups granulated sugar

Result: 396 g

198 g per cup.

Cup sizes compared

Inputs: 1 metric cup / 1 UK cup to ml

Result: 250 ml / 284.13 ml

A US cup is 236.59 ml.

Limitations

  • Ingredient weights are averages; brands, humidity and how the cup is filled change them by 10% or more.
  • Only the ingredients in the list can be converted between volume and weight.
  • Australian 20 ml tablespoons and the US labelling cup of 240 ml are not offered as units.

Where publishers use it

  • A baking blog that publishes American recipes for readers in Europe
  • A cookbook author's website converting older recipes to grams
  • A cookery class handout on why bakers weigh flour
  • An expat community site with recipes from home
  • A kitchen-scale shop's buying guide

Questions

How many grams is a cup of flour?

King Arthur Baking's chart gives 120 g for a US cup of all-purpose or bread flour, measured by spooning flour into the cup and levelling it. Scooping straight from the bag packs it and can give 140 g or more, which is why bakers prefer weights.

Is a cup the same everywhere?

No. A US customary cup is 236.6 ml, the metric cup used in many Commonwealth recipes is 250 ml, and the old British imperial cup is 284 ml. Nutrition labels in the US use a rounded 240 ml cup. Check where your recipe comes from.

Why do I need to pick an ingredient?

Cups measure volume and grams measure weight. A cup of honey weighs about 336 g, a cup of flour 120 g and a cup of cocoa about 84 g, so converting between them needs the ingredient's density. Within volumes or within weights no ingredient is needed.

How big is a tablespoon?

A US tablespoon is 14.79 ml, a metric tablespoon 15 ml - close enough for most cooking. Australia uses a 20 ml tablespoon, which this widget does not list; use 4 metric teaspoons instead.

Is butter by the cup accurate?

Yes - butter is dense and consistent, so 1 cup (2 US sticks) is 227 g in the King Arthur chart. Melted butter measures the same weight but slightly less volume.

Sources

  1. Ingredient Weight Chart - King Arthur Baking Company . Volume, ounce and gram equivalents for common baking ingredients, e.g. 1 cup all-purpose flour 120 g, granulated sugar 198 g, 1 tbsp table salt 18 g. Checked 2026-10-01.
  2. FoodData Central (SR Legacy portions: milk 171265, heavy cream 170859, plain yogurt 171284, water 174158) - USDA Agricultural Research Service . Portion weights: whole milk 1 cup 244 g; heavy cream 1 cup fluid 238 g; plain whole-milk yogurt 1 cup 245 g; bottled water 1 ml 1 g. Checked 2026-10-01.
  3. NIST Guide to the SI, Appendix B.9 - National Institute of Standards and Technology . Cup (U.S.) 236.5882 ml, tablespoon 14.78676 ml, teaspoon 4.928922 ml, imperial fluid ounce 28.41306 ml, ounce 28.34952 g, pound 0.4535924 kg. Checked 2026-10-01.

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A2Z Tools Cooking Converter
https://a2z.tools/embed/cooking-converter

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