Free Recipe Conversion Calculator – Convert Cooking and Baking Measurements

What Is a Recipe Conversion Calculator?

A Recipe Conversion Calculator is a free online tool that converts ingredient measurements and helps you adapt recipes to suit your needs.

Different cookbooks and recipe websites use different measurement systems.

For example, British recipes commonly use grams and millilitres, while many American recipes use cups, tablespoons and ounces.

This can make following an unfamiliar recipe confusing, particularly when baking, where ingredient measurements can affect the finished result.

Our cooking measurement converter helps you switch between these units quickly.

It is particularly useful for converting recipes from American measurements to UK metric measurements.

How to Use Our Recipe Conversion Calculator

Our calculator includes three useful conversion tools.

1. Ingredient Measurement Converter

Use this option when you want to convert an ingredient from one measurement unit to another.

For example, you might want to convert:

• 8 oz of flour into grams.
• 250 ml of milk into cups.
• 2 tablespoons into millilitres.
• 500 g into pounds.
• 1 cup of caster sugar into grams.

Enter the quantity, choose the original measurement unit and select the unit you want to convert to.

For conversions between weight and volume, select the appropriate ingredient where available.

This is important because different ingredients have different densities.

2. Recipe Serving Size Converter

Use the recipe scaling feature when you want to prepare more or fewer portions than the original recipe.

For example, if a recipe serves four people but you need six portions, the calculator can help you work out the adjusted ingredient quantities.

The basic formula is:

New Ingredient Quantity = Original Quantity × (Required Servings ÷ Original Servings)

This is useful when cooking for guests, reducing recipes for smaller households or preparing extra portions.

3. Oven Temperature Converter

Use the oven conversion feature when a recipe specifies a temperature in a different format.

You can compare common settings in Celsius, Fahrenheit and UK Gas Marks.

This is particularly helpful when following American baking recipes or traditional British recipes that use Gas Marks.

Cooking Measurement Conversion Chart

The following table shows common conversions used in UK cooking and baking.

Important: A cup measures volume, not weight. The weight of one cup depends on the ingredient being measured. Cup conventions can also vary between countries, so check which measurement system your recipe uses.

How to Convert Grams to Cups

One of the most common baking questions is how to convert grams into cups.

Unlike converting grams into ounces, there is no single conversion factor that works for every ingredient.

This is because grams measure weight, while cups measure volume.

For example, a cup of flour weighs considerably less than a cup of sugar.

Common Grams to Cups Conversion Examples

The following figures are approximate, based on a US customary cup of about 237 ml.

These are general reference values. Actual weights depend on the ingredient, brand, measuring method and how tightly the cup is filled.

For greater accuracy when baking, use digital kitchen scales whenever possible.

How Many Grams Are in an Ounce?

One international avoirdupois ounce is equal to approximately 28.35 grams.

To convert ounces into grams, multiply the number of ounces by 28.3495.

For example:

8 oz × 28.3495 = 226.8 g

This is commonly rounded to 227 g.

Ounces to Grams Conversion Chart

This conversion is useful when following older British cookbooks and recipes that use imperial weights.

How to Convert Cups to Millilitres

Cups are commonly used in American recipes to measure liquids and dry ingredients.

For liquids, converting cups into millilitres is straightforward once you know which cup standard the recipe uses.

One US customary cup is approximately 236.6 ml, often rounded to 237 ml.

US Cups to Millilitres Chart

Some recipes use a 250 ml metric cup instead. Australian and other international recipes may follow different conventions.

Always check the recipe’s country of origin where possible.

Teaspoon and Tablespoon Conversions

Teaspoons and tablespoons are commonly used for smaller quantities of ingredients such as baking powder, spices, oils and flavourings.

In standard UK metric cooking measurements:

• 1 teaspoon = 5 ml
• 1 tablespoon = 15 ml
• 1 tablespoon = 3 teaspoons
• ½ tablespoon = 7.5 ml
• ½ teaspoon = 2.5 ml
• ¼ teaspoon = 1.25 ml

Use proper measuring spoons rather than ordinary cutlery, as household spoon sizes can vary.

How to Convert American Recipes to UK Measurements

American recipes often use a combination of cups, Fahrenheit oven temperatures and ounces.

British recipes generally favour metric weights and volumes.

When converting an American recipe into UK measurements, consider three important areas.

Ingredient Weights

Convert ounces and pounds into grams and kilograms.

For example, 1 lb of butter is approximately 454 g.

Cups and Spoon Measurements

Convert cups into millilitres for liquids or use ingredient-specific weight conversions for dry ingredients.

For baking, weighing ingredients is generally more reliable than measuring them by volume.

Oven Temperatures

American recipes usually specify Fahrenheit.

For example, 350°F is approximately 177°C, commonly rounded to 180°C for a conventional oven.

If using a fan oven, you may need a lower setting depending on the recipe and manufacturer’s instructions.

Our Recipe Conversion Calculator helps you manage these different measurements in one place.

How to Increase or Decrease a Recipe

Sometimes the measurements in a recipe are correct, but the number of portions is not suitable.

Perhaps your recipe serves four people and you want to cook for eight, or you need to reduce a recipe for two.

To adjust a recipe, calculate the scaling factor:

Scaling Factor = Required Servings ÷ Original Servings

Example: Increasing a Recipe from 4 to 6 Servings

A recipe serving four people requires:

• 400 g chicken
• 200 g rice
• 300 ml stock
• 100 g vegetables

To prepare six servings, multiply every ingredient by 1.5.

Remember that cooking times and seasoning do not always scale proportionally with ingredient quantities.

For more detailed ingredient scaling, use our separate Recipe Serving Size Calculator.

Oven Temperature Conversions for Baking

Oven temperatures are another common source of confusion when following recipes from different countries.

The following chart shows familiar approximate oven settings.

These are commonly used rounded cooking equivalents, not exact mathematical conversions.

Fan oven adjustments are approximate and may vary by appliance and recipe.