Cooking Measurement Converter

Cooking measurements are uniquely frustrating because they combine volume-based ingredients, weight-based ingredients, temperature in two competing systems, and oven settings that vary by country. An American trying a British recipe encounters all of these at once — cups that don't exist in UK recipes, grams everywhere, and oven temperatures in Celsius or gas mark numbers. Getting the conversions right can be the difference between a successful dish and a disappointing one.

Temperature: Fahrenheit, Celsius, and Gas Marks

The Fahrenheit-Celsius conversion is one of the most commonly needed cooking conversions, since American recipes use Fahrenheit and nearly every other country uses Celsius. The exact formula: °C = (°F - 32) × 5/9, or equivalently °F = (°C × 9/5) + 32.

Key oven temperature conversions: 300°F = 149°C (slow oven), 325°F = 163°C, 350°F = 177°C (moderate, most common baking), 375°F = 191°C, 400°F = 204°C, 425°F = 218°C, 450°F = 232°C (very hot), 475°F = 246°C.

British recipes sometimes specify oven temperature using gas mark numbers, a system from gas-powered ovens that predates electric. Gas mark 4 = 350°F = 177°C (standard baking), gas mark 6 = 400°F = 204°C, gas mark 7 = 425°F = 218°C. If you see "Gas mark 5" in a British recipe and have an electric oven, that's 375°F = 190°C.

Baking Math: Ratios and Percentages

Professional baking uses baker's percentages to express recipe ratios. Baker's percentage states each ingredient's weight relative to the flour weight as 100%. A bread recipe with 1,000g flour, 620g water, 20g salt, and 10g yeast: water = 62%, salt = 2%, yeast = 1%. This notation makes scaling trivial and allows comparison between recipes.

Basic ratio baking simplifies recipe memory. A standard muffin: 2 cups flour (240g), 2 tsp baking powder, ½ tsp salt, 1 cup milk (240g), 1 egg, ¼ cup oil (55g). Cookie dough basics: 2.5:1 flour-to-fat ratio by weight produces typical shortbread texture. 1:1 butter-to-sugar by weight before adding flour gives a standard sugar cookie foundation.

For experienced home cooks, these ratios become intuition — allowing improvisation within reliable structural constraints. Understanding the conversions between cups, grams, and milliliters for your most-used ingredients is the foundation that makes ratio-based cooking possible without measuring every time.

Volume to Volume: US Cups, Tablespoons, and Teaspoons

The US volume measurement hierarchy: 1 cup = 16 tablespoons = 48 teaspoons = 8 fluid ounces = 236.6 mL. Most cooking rounds this to 240 mL for simplicity without meaningful error. Half a cup = 8 tablespoons = 24 teaspoons = 120 mL. Quarter cup = 4 tablespoons = 60 mL.

The tablespoon-to-teaspoon relationship is the one cooks need most readily: 1 tablespoon = 3 teaspoons. This matters for scaling recipes. A recipe calling for 2 teaspoons and you want to triple it: 2 × 3 = 6 teaspoons = 2 tablespoons. Measuring 6 teaspoons individually is slow; measuring 2 tablespoons is fast.

Converting to and from milliliters for international recipes: 1 tablespoon = 14.79 mL ≈ 15 mL. 1 teaspoon = 4.93 mL ≈ 5 mL. 1 cup = 236.6 mL ≈ 240 mL. These approximations introduce errors of 1 to 3% — fine for most cooking, problematic for precision baking where 5% variation in flour can noticeably affect texture.

Scaling Recipes Up and Down

Recipe scaling is multiplication — but some ingredients don't scale linearly. Salt, baking powder, baking soda, and spices often need less than proportional increases at larger scales because their effects compound differently in larger volumes. A cake recipe doubled might use 1.75× the leavening rather than 2× to avoid over-rising. This is a matter of baker judgment rather than mathematical certainty, but it's worth knowing that exact doubling of all ingredients doesn't always produce the best result.

Sarah, a 39-year-old home baker in Portland, regularly scales a cookie recipe designed for 24 cookies up to 6 dozen for holiday gifts. The original calls for 2¼ cups flour, 1 tsp baking soda, 1 tsp salt. Scaling to 3× (for 72 cookies): flour = 6¾ cups, baking soda = 1 tablespoon, salt = 1 tablespoon. These scale exactly because the recipe doesn't involve unusual compound effects.

For liquid ingredients in scaled recipes, measuring by weight eliminates accumulated measurement error. Three cups of milk measured three times with a liquid measuring cup introduces three separate measurement errors. Weighing 711 grams of milk once (3 × 237g = 711g) is faster and more accurate.

Related Calculators

• Volume Converter
• Weight Converter
• Cooking Measurement Converter

Weight Conversions for Ingredients

Many European, Australian, and professional recipes list ingredients by weight in grams rather than volume. This is actually more accurate because the same volume of a dry ingredient can weigh very differently depending on how it's packed. A cup of flour weighs 120 to 150 grams depending on whether it's lightly spooned or scooped from a packed bag.

Common ingredient weights per US cup: all-purpose flour = 120-130 grams (120 if properly sifted), granulated sugar = 200 grams, packed brown sugar = 220 grams, powdered sugar = 115 grams, butter = 227 grams (this is one US stick = ½ cup), rolled oats = 90 grams, cocoa powder = 85 grams, grated Parmesan = 100 grams, honey = 340 grams, water = 237 grams.

For converting a gram measurement to cups when you don't have a scale: divide the gram measurement by the ingredient's weight-per-cup. 300 grams of flour ÷ 125 g/cup = 2.4 cups. 400 grams of sugar ÷ 200 g/cup = 2 cups. This produces approximate results with inherent measurement uncertainty, which is why buying a kitchen scale ($15 to $30) eliminates the entire problem and improves baking consistency dramatically.

International Recipe Adaptation

Australian and UK tablespoons are 20 mL, compared to 15 mL for the US tablespoon. This 33% difference matters in recipes where tablespoon measurements represent meaningful proportions. An Australian recipe calling for 2 tablespoons (40 mL) translates to about 2 tablespoons plus 1 teaspoon (35 mL) in US measurements — close enough for most purposes, but the discrepancy adds up in recipes with multiple tablespoon-measured ingredients.

Japanese recipes frequently use "large tablespoon" (tablespoon = 15 mL) and "small tablespoon" (teaspoon = 5 mL) terminology without using cup measurements. Cup sizes in Japan are 200 mL versus the US 240 mL — a 17% difference that matters in baking. A Japanese recipe using 1 cup of flour means 200 mL of flour, not the 240 mL US cup.

French and Italian recipes often give flour in "cuillères à soupe" (tablespoons of 15 mL) and use kilograms for large quantities. A French bread recipe calling for 500g of flour: 500 ÷ 125 = 4 cups of US all-purpose flour (measuring by volume, not weight). But bakers note: weighing 500g is more accurate than measuring 4 cups.