Cooking Converter: Tips & How-Tos

Best Practices

Weigh ingredients for baking, don't measure by volume. Volume measures for flour vary by up to 20% depending on how the cup is filled. A kitchen scale gives consistent results and is especially critical for bread, pastry, and layer cakes.
Spoon flour into the cup, don't scoop. If you must use cup measures for flour, spoon it into the measuring cup and level with a knife. Scooping compacts the flour and can add 30% more than the recipe intends.
Level dry measures with a straight edge. A heaped cup of baking powder or cocoa can significantly alter a recipe. Use the flat back of a knife to level the top of any dry measure for consistent results.
US and UK tablespoons are different sizes. A US tablespoon holds 14.79 ml; a UK tablespoon holds 17.76 ml. For large quantities, this difference accumulates. The converter uses US tablespoons by default — specify if you are using UK measurements.
Brown sugar should be packed unless the recipe says otherwise. Unless a recipe specifies 'lightly packed' or 'unpacked,' brown sugar is measured by pressing it firmly into the cup. The converter assumes packed brown sugar for density calculations.

Scale all ingredients proportionally. When doubling or halving a recipe, every ingredient must scale by the same factor — not just the main ones. A forgotten teaspoon of baking powder that doesn't scale can ruin a doubled cake batter.
Leavening agents don't scale linearly for large batches. When multiplying a recipe by 3 or more, use about 75–80% of the calculated leavening amount. Too much baking powder or soda can make a cake taste metallic and cause it to collapse.
Season less aggressively when scaling up. Salt, spices, and strong flavourings (vanilla, citrus zest) do not always need to be scaled at the same ratio as the rest of the recipe. Add them gradually and taste before adding the full scaled amount.
Pan size affects cooking time when scaling. A doubled batter in the same pan size is thicker and takes longer to cook. Either use a larger pan of proportionally similar depth or increase baking time and test for doneness early.

1 US cup = 240 ml, but 1 metric cup = 250 ml. Australian, Canadian, and Japanese recipes use a 250 ml cup. US recipes use 240 ml. For most recipes the 10 ml difference is negligible, but for precision baking it can matter.
1 tablespoon = 3 teaspoons = 15 ml (US). This ratio holds for US measures. UK tablespoons are slightly larger. When a recipe calls for 'a tablespoon' without specifying the origin, assume US if the recipe is from a US source.
1 stick of butter = 113 g = 8 tablespoons = ½ cup. US butter is sold in sticks with tablespoon markings on the wrapper. UK butter is sold in blocks. The cooking converter handles the stick-to-gram conversion for common baking quantities.
Fluid ounces measure volume, not weight. 8 fluid ounces of water weighs about 8 ounces by weight because water's density is close to 1 g/ml. This coincidence does not hold for heavier ingredients like honey or lighter ones like flour.
Grams are the safest unit for international recipes. Grams are unambiguous: there is only one gram, regardless of the recipe's national origin. When in doubt about which cup or tablespoon size a recipe intends, look for a gram-weight equivalent.

Finding the gram weight of an ingredient measured in US cups.

Open the Cooking Converter.
Select the ingredient from the dropdown (e.g. All-Purpose Flour).
Set From to 'Cups' and To to 'Grams'.
Enter the number of cups from the recipe.
The gram equivalent appears — use this weight on your kitchen scale for precise results.

Tripling a recipe for a larger group while keeping ingredient ratios correct.

Identify the scaling factor: 12 ÷ 4 = 3.
For each ingredient, enter the original quantity in the Cooking Converter.
Multiply the result by 3, or simply multiply the original measurement by 3 before entering.
For leavening agents (baking powder, yeast), use 75–80% of the tripled amount to avoid an overpowering effect.
Note the scaled amounts before starting so you don't lose track mid-recipe.

Verifying a medicine dose given in tablespoons against a metric syringe.

Open the Cooking Converter and select 'Water' or any liquid ingredient.
Set From to 'Tablespoons' and To to 'Milliliters'.
Enter the number of tablespoons specified.
The ml equivalent appears — 1 US tablespoon = 14.79 ml, so 2 tablespoons ≈ 29.6 ml.
Confirm with a metric syringe or medicine cup that reads in ml.

Adapting an American recipe that uses ounces to metric grams for a UK kitchen scale.

Measuring a cup quantity when you only have a tablespoon measure available.

Cutting a recipe in half while maintaining the right rise and texture.

Halve every ingredient quantity.
For baking powder, use slightly more than half — about 60% of the halved amount — to ensure adequate leavening in the smaller volume.
For baking soda, use exactly half.
Check the pan size: a halved recipe often fits a smaller pan, which may affect baking time.
Start checking for doneness 5–10 minutes earlier than the original baking time.

Adapting a European gram-based recipe for US cup measures.

Sticky liquids cling to measuring cups, causing measurement errors.

Lightly coat the inside of the measuring cup with cooking spray before pouring.
Use the Cooking Converter to find the gram equivalent of the required amount.
Instead, weigh the honey directly on a scale tared to zero — this is more accurate and requires no spray.
1 tablespoon of honey weighs approximately 21 g and 1 cup weighs approximately 340 g.