Metric vs Imperial in the Kitchen: Complete Conversion Chart

March 31, 2026 · 12 min read

You've found a gorgeous recipe online—a French tarte tatin, perhaps, or a classic American chocolate chip cookie. The ingredients list looks perfect. Then you notice: "225g unsalted butter." Or "2¼ cups all-purpose flour." If you grew up with one measurement system and the recipe uses the other, you're about to enter the confusing world of kitchen unit conversion.

The good news? Once you understand the core relationships between cups, milliliters, fluid ounces, grams, and tablespoons, converting recipes becomes second nature. This guide gives you every chart, formula, and practical tip you need to confidently cook and bake with recipes from anywhere in the world.

Two Systems, One Kitchen

The metric system (milliliters, liters, grams, kilograms) is used in kitchens across Europe, Asia, Australia, South America, and most of Africa. It's clean and logical: everything scales by factors of 10, 100, or 1,000. Need to convert 500 milliliters to liters? Just divide by 1,000. Simple.

The imperial/US customary system (cups, fluid ounces, tablespoons, teaspoons, pounds, ounces) is primarily used in the United States. It evolved organically from older English measurements and is admittedly less intuitive—there are 3 teaspoons in a tablespoon, 16 tablespoons in a cup, 2 cups in a pint, and so on. The relationships aren't based on powers of ten, which makes mental math more challenging.

To complicate things further, the UK historically used Imperial measurements (slightly different from US customary) but has largely shifted to metric for cooking. Old British cookbooks might call for "half a pint of cream," meaning 284 ml (an Imperial pint is 568 ml), while an American "half pint" would be only 237 ml. That's a 20% difference—enough to throw off a custard or sauce completely.

Understanding both systems isn't just about following recipes. It's about culinary freedom. When you can seamlessly convert between metric and imperial, you unlock recipes from every corner of the globe. That Italian nonna's pasta recipe? The Japanese cheesecake tutorial? The American Southern biscuit technique? All suddenly accessible.

Volume Conversions: Cups, Ml, Oz, and Tablespoons

Volume measurements are the most common source of confusion in recipe conversion. The fundamental relationship to remember is that 1 US cup equals 236.588 milliliters, though most cooks round this to 240 ml for practical purposes.

Here's the complete breakdown of US volume measurements:

Quick Reference: Tablespoons and Teaspoons

These smaller measurements are crucial for spices, extracts, and leavening agents:

• 1 tablespoon = 3 teaspoons
• 1 tablespoon = 15 ml
• 1 teaspoon = 5 ml
• 16 tablespoons = 1 cup
• 4 tablespoons = ¼ cup

If a recipe calls for "a pinch" or "a dash," these aren't standardized measurements but generally mean:

• Pinch: About ⅛ teaspoon (0.6 ml) — what you can hold between thumb and forefinger
• Dash: About ⅛ teaspoon to ¼ teaspoon (0.6-1.2 ml) — a quick shake from a bottle
• Smidgen: About 1/32 teaspoon (0.15 ml) — rarely used but occasionally appears in old recipes

Weight Conversions: Ounces and Grams

Weight measurements are actually more reliable than volume measurements for cooking, especially for dry ingredients. A cup of flour can vary by 30-40 grams depending on how you scoop it, but 120 grams of flour is always 120 grams.

The basic conversion is straightforward: 1 ounce (oz) = 28.35 grams (g). Most recipes round this to 28 or 30 grams for simplicity.

Common Ingredient Weight Conversions

Different ingredients have different densities, so volume-to-weight conversions vary by ingredient. Here are the most commonly used conversions:

Flour (all-purpose):

• 1 cup = 120-125 g (4.4 oz)
• 1 tablespoon = 8 g
• 1 teaspoon = 3 g

Sugar (granulated white):

• 1 cup = 200 g (7 oz)
• 1 tablespoon = 12.5 g
• 1 teaspoon = 4 g

Brown sugar (packed):

• 1 cup = 220 g (7.75 oz)
• 1 tablespoon = 14 g

Butter:

• 1 cup (2 sticks) = 227 g (8 oz)
• 1 stick = 113 g (4 oz)
• 1 tablespoon = 14 g (0.5 oz)

Honey, maple syrup, molasses:

• 1 cup = 340 g (12 oz)
• 1 tablespoon = 21 g

Cocoa powder:

• 1 cup = 100 g (3.5 oz)
• 1 tablespoon = 6 g

Temperature Conversions: Fahrenheit and Celsius

Oven temperature is another critical conversion point. American recipes use Fahrenheit (°F), while the rest of the world uses Celsius (°C). Getting this wrong can mean the difference between perfectly golden cookies and burnt disasters.

The conversion formulas are:

• Celsius to Fahrenheit: (°C × 9/5) + 32 = °F
• Fahrenheit to Celsius: (°F - 32) × 5/9 = °C

But you don't need to memorize formulas. Here's a practical conversion chart for common baking temperatures:

Note that Gas Mark is an older British system still found in some UK cookbooks. Each gas mark represents roughly 25°F (14°C) increments.

Why Baking Demands Precision

Cooking is forgiving. Baking is chemistry. When you're making a stew or stir-fry, a little extra liquid or a slightly different vegetable ratio won't ruin the dish. But baking is a precise science where ratios matter enormously.

Consider what happens when you add too much flour to a cake batter. The extra flour absorbs moisture, develops more gluten, and results in a dense, dry cake instead of a light, tender crumb. Too little flour, and your cake might collapse in the center or spread too thin.

The Scoop-and-Sweep Problem

Here's why volume measurements are problematic for baking: the way you fill a measuring cup dramatically affects how much ingredient you actually use. If you scoop flour directly from the bag with your measuring cup, you compress the flour and can end up with 30-40% more flour than the recipe intends.

The proper technique is to:

1. Fluff the flour in its container with a spoon
2. Spoon flour into the measuring cup without packing
3. Level off the top with a straight edge (the "sweep")

But even with perfect technique, different flours have different densities. Cake flour is lighter than all-purpose flour, which is lighter than bread flour. A cup of each weighs differently, yet many recipes just say "1 cup flour" without specifying the weight.

This is why professional bakers and serious home bakers use weight measurements. 120 grams of flour is 120 grams whether you scoop it, spoon it, or pour it. The margin for error disappears.

Hydration Ratios in Bread Baking

Bread bakers talk about "hydration percentage"—the ratio of water to flour by weight. A 70% hydration dough means 700 grams of water for every 1,000 grams of flour. This ratio determines the dough's texture, how it handles, and the final bread's crumb structure.

You simply cannot calculate hydration ratios accurately using cups and tablespoons. A cup of bread flour might weigh anywhere from 120 to 150 grams depending on how it's measured. That variability makes it impossible to achieve consistent results with artisan breads, sourdough, or pizza dough.

Common Recipe Conversions

Let's walk through some real-world conversion scenarios you'll encounter when adapting recipes.

Converting an American Cookie Recipe to Metric

Original recipe calls for:

• 2¼ cups all-purpose flour
• 1 cup (2 sticks) butter, softened
• ¾ cup granulated sugar
• ¾ cup packed brown sugar
• 2 large eggs
• 2 teaspoons vanilla extract
• 1 teaspoon baking soda
• 1 teaspoon salt
• 2 cups chocolate chips

Metric conversion:

• 280 g all-purpose flour (2¼ × 125g)
• 227 g butter, softened
• 150 g granulated sugar (¾ × 200g)
• 165 g packed brown sugar (¾ × 220g)
• 2 large eggs (no conversion needed)
• 10 ml vanilla extract
• 5 g baking soda
• 6 g salt
• 340 g chocolate chips

Converting a European Cake Recipe to US Measurements

Original recipe calls for:

• 200 g all-purpose flour
• 200 g caster sugar
• 200 g butter, softened
• 4 large eggs
• 2 teaspoons baking powder
• 100 ml milk
• 1 teaspoon vanilla extract

US conversion:

• 1⅔ cups all-purpose flour (200g ÷ 120g per cup)
• 1 cup granulated sugar (200g ÷ 200g per cup)
• ¾ cup + 2 tablespoons butter (200g ÷ 227g per cup)
• 4 large eggs (no conversion needed)
• 2 teaspoons baking powder (no conversion needed)
• ⅓ cup + 1 tablespoon milk (100ml ÷ 240ml per cup)
• 1 teaspoon vanilla extract (no conversion needed)

Scaling Recipes Up or Down

Sometimes you need to double a recipe for a party or halve it for a smaller household. The math is straightforward with metric measurements—just multiply or divide. With imperial measurements, you need to know your fraction math:

Halving common measurements:

• 1 cup → ½ cup
• ¾ cup → ⅜ cup (6 tablespoons)
• ⅔ cup → ⅓ cup
• ½ cup → ¼ cup
• ⅓ cup → 2 tablespoons + 2 teaspoons
• ¼ cup → 2 tablespoons
• 1 tablespoon → 1½ teaspoons

Doubling common measurements:

• ½ cup → 1 cup
• ⅓ cup → ⅔ cup
• ¼ cup → ½ cup
• ⅛ cup → ¼ cup
• 1 tablespoon → 2 tablespoons

Use our Recipe Scaler Tool to automatically adjust ingredient quantities for any serving size.

International Cup Sizes and Regional Differences

Not all cups are created equal. This is one of the most overlooked sources of confusion in international cooking.

The Three Main Cup Standards

US Cup (Legal): 240 ml
This is the standard in American recipes and USDA guidelines. Most US measuring cups are actually slightly under 240 ml (closer to 236.588 ml), but recipes assume 240 ml for simplicity.

Metric Cup: 250 ml
Used in Australia, New Zealand, Canada, and increasingly in the UK. This is a nice round number that fits the metric system perfectly. The difference from a US cup is about 4%, which can matter in baking.

Imperial Cup (UK, historical): 284 ml
Rarely used today, but you'll find it in older British cookbooks. This is half an Imperial pint. The UK has largely moved to metric measurements, but some traditional recipes still reference Imperial cups.

Japanese Cup

Japan uses a unique cup measurement: 1 Japanese cup = 200 ml. This is particularly important when making Japanese recipes like rice dishes, where the rice-to-water ratio is critical. Japanese rice cookers come with measuring cups marked for 200 ml, not 240 ml.

If you're making Japanese rice using a US measuring cup, you'll need to adjust:

• 1 Japanese cup rice = ⅘ US cup (or about 160 ml)
• For every 1 cup of rice, use 1.1-1.2 cups of water (depending on rice type)

Tablespoon Variations

Even tablespoons aren't universal:

• US, Canada: 1 tablespoon = 15 ml
• Australia: 1 tablespoon = 20 ml (4 teaspoons instead of 3)
• UK (