Unit Conversion for Cooking Recipes
Cooking is one of the most practical arenas where unit conversion matters daily. US recipes use cups, tablespoons, teaspoons, ounces, and Fahrenheit. European, Australian, and most international recipes use grams, milliliters, and Celsius. A recipe for the perfect croissant from a French cookbook, or a chocolate chip cookie recipe from a US food blog, requires accurate unit conversion to work correctly. This guide covers every common cooking measurement conversion with practical tables, ingredient-specific weights, and oven temperature equivalents.
Volume Conversions for Cooking: Cups, Tablespoons, and Milliliters
US volume measurements for cooking use a specific set of units that do not directly correspond to metric. US cooking volume units: 1 teaspoon (tsp) = 4.929 mL 1 tablespoon (tbsp) = 3 teaspoons = 14.787 mL 1 fluid ounce (fl oz) = 2 tablespoons = 29.574 mL 1/4 cup = 4 tablespoons = 59.147 mL 1/3 cup = 78.863 mL 1/2 cup = 8 tablespoons = 118.294 mL 3/4 cup = 12 tablespoons = 177.441 mL 1 cup = 16 tablespoons = 236.588 mL 1 pint (US) = 2 cups = 473.176 mL 1 quart (US) = 4 cups = 946.353 mL 1 gallon (US) = 16 cups = 3,785.41 mL = 3.785 L Quick metric equivalents to memorize: 1 cup is approximately 240 mL 1 tablespoon is approximately 15 mL 1 teaspoon is approximately 5 mL Australian tablespoon note: In Australia, 1 tablespoon = 20 mL (4 teaspoons), not 15 mL as in the US and UK. This difference can affect sensitive baked goods. UK and European cooking typically uses weight (grams) rather than volume measurements, which is more accurate. A cup of flour can vary by 20-30 grams depending on how tightly it is packed.
Weight Conversions for Cooking: Grams and Ounces
Professional baking uses weight measurements because they are more precise than volume. Key weight conversion: 1 ounce = 28.3495 grams 1 pound = 453.592 grams Common baking ingredient weights per US cup: Flour: All-purpose flour: 120-130 g (125 g is a common standard) Cake flour: 100 g sifted, 110 g unsifted Bread flour: 120 g Sugars: Granulated white sugar: 200 g Powdered/confectioners sugar: 120 g Light brown sugar (packed): 200 g Honey: 340 g Fats: Butter (2 sticks = 1 cup): 227 g 1 tablespoon butter: 14 g Vegetable oil: 218 g Dairy: Milk (whole): 244 g Heavy cream: 238 g Other: 1 large egg (without shell): 50 g Cocoa powder: 85 g per cup Rice (uncooked): 185-200 g per cup
Oven Temperature Conversion: Celsius, Fahrenheit, and Gas Mark
Oven temperatures are one of the most critical cooking conversions. Oven temperature conversion table: 150 C = 300 F = Gas Mark 2 — Very slow/warm oven 160 C = 325 F = Gas Mark 3 — Slow oven 170 C = 340 F = Gas Mark 3.5 — Moderately slow 180 C = 350 F = Gas Mark 4 — Moderate oven (most cakes and cookies) 190 C = 375 F = Gas Mark 5 — Moderately hot 200 C = 400 F = Gas Mark 6 — Hot oven (roasting vegetables, pastries) 220 C = 425 F = Gas Mark 7 — Very hot (pizza, crusty bread) 230 C = 450 F = Gas Mark 8 — Very hot 240 C = 475 F = Gas Mark 9 — Extremely hot 250 C = 480 F = Gas Mark 9 — Maximum oven temperature Gas Mark is a scale used by some UK and European oven models. Gas Mark 1 is approximately 140 C (275 F). Each increment adds approximately 14 C. Fan ovens: Fan-assisted (convection) ovens circulate hot air, cooking more efficiently. Reduce temperature by 20 C (about 25 F) from conventional oven settings, or reduce cooking time by approximately 10-15%. The formula: for the most common baking temperature of 180 C: (180 x 1.8) + 32 = 356 F, rounded to 350 F in most US recipes.
Scaling Recipes: Halving, Doubling, and Converting Servings
When scaling recipes, unit conversion and proportion both matter. Scaling is multiplicative: double every ingredient to double the recipe. But some elements do not scale linearly. Baking powder and baking soda: when doubling a recipe, you often do not need to double the leavening agents. Over-leavened baked goods rise too fast and collapse. A common guideline is to scale leavening agents by 75% when doubling. Salt: also often reduced proportionally when scaling up. Taste as you go. Cooking time and temperature do not scale with recipe size. Two batches of cookies bake in the same time and at the same temperature as one batch. Converting from grams to cups and back: the most accurate approach is to use weight rather than volume for scaling. If a recipe calls for 200 g of flour and you want half the recipe, you need 100 g — no conversion needed. Practical approach for halving a volume-based recipe: 1 cup becomes 1/2 cup 1/2 cup becomes 1/4 cup 1/3 cup becomes approximately 2 tablespoons plus 2 teaspoons 1 tablespoon becomes 1.5 teaspoons 1 teaspoon becomes 1/2 teaspoon The WikiPlus Unit Converter handles all cooking unit conversions for volume, weight, and temperature.
Frequently Asked Questions
- How many grams is one cup of flour?
- One US cup of all-purpose flour weighs approximately 120 to 130 grams, with 125 grams being a commonly used standard. The variation depends on how the flour is measured — spooning flour into the cup and leveling gives about 120 g, while scooping directly gives 130-140 g. Professional baking recipes specify grams to avoid this ambiguity.
- What temperature is 180 degrees Celsius in Fahrenheit?
- 180 degrees Celsius equals 356 degrees Fahrenheit using the exact formula (180 x 1.8) + 32 = 356. In practice, most recipes and oven dials round this to 350 F. This is the most common baking temperature for cakes, cookies, brownies, and many other baked goods. Gas Mark 4 is the approximate equivalent on gas oven settings.
- Is a metric cup the same as a US cup?
- No. A US customary cup is 236.588 mL. An Australian and Canadian metric cup is 250 mL. The UK does not have an official cup measurement and most British recipes use grams and milliliters. For most recipes the difference is small enough not to matter. For sensitive baking recipes, the 6% difference between a US cup and an Australian cup can affect the outcome.