Cooking Conversion Calculator - Free Online Tool

Convert volume, weight, and temperature for any recipe — including ingredient-specific weight-to-volume conversions

Cooking is both an art and a science, and at the heart of every successful recipe lies accurate measurement. Whether you are following a classic French brioche recipe in metric units, scaling a beloved American casserole into UK measures, or trying to understand what 'Gas Mark 6' means on a European oven, cooking conversions are an everyday challenge for home cooks and professional chefs alike. Our free Cooking Conversion Calculator removes the guesswork entirely. The calculator covers three fundamental measurement categories: volume (cups, tablespoons, teaspoons, fluid ounces, pints, quarts, gallons, milliliters, and liters — in both US Customary and UK Imperial systems), weight (milligrams, grams, kilograms, ounces, and pounds), and temperature (Celsius, Fahrenheit, and Kelvin, with a full Gas Mark reference table). Switching between these categories is instant via the tabs at the top of the tool. One of the most powerful features of our calculator is ingredient-specific density conversion. Standard unit converters treat all liquids and powders as equal, but a cup of all-purpose flour weighs very differently from a cup of honey. When you select a cross-boundary conversion (volume to weight or weight to volume), the tool reveals an ingredient dropdown covering 20 of the most common baking and cooking ingredients — from water and whole milk to almond flour, cocoa powder, rolled oats, and olive oil. Each ingredient carries a carefully researched density value (in g/mL) that makes conversions accurate rather than approximate. If your ingredient is not in the list, you can enter a custom density value instead. For recipe developers and food bloggers, the multi-unit conversion table is a time-saver. After you enter a value and choose units, the tool automatically calculates the equivalent in every other common unit within the same category — so entering '1 cup' instantly shows the value in tablespoons, teaspoons, fluid ounces, pints, quarts, gallons, milliliters, and liters all at once. The accompanying bar chart makes relative sizes immediately visual, highlighting your selected units in the primary color. Fraction-friendly input is built in: type '1/3', '1 1/2', or any decimal and the parser handles it correctly. Quick-value buttons (1/4, 1/3, 1/2, 1, 2, 4) let you fill the most common recipe amounts with a single tap. For bakers and cooks who work with ovens, the Temperature tab offers a comprehensive conversion between Celsius, Fahrenheit, and Kelvin, a heat-level gauge showing where your temperature falls on a low-to-very-hot scale, and a complete Gas Mark reference table with all marks from 1/4 through 9 highlighted to show which Gas Mark is closest to your input temperature. Whether you are scaling a recipe for a crowd, baking from an international cookbook, adapting a recipe for a different country's measurement standards, or simply trying to figure out how many grams are in half a cup of butter, the Cooking Conversion Calculator has you covered in seconds.

Understanding Cooking Measurements

What Are Cooking Units?

Cooking measurements come in three broad families: volume, weight, and temperature. Volume units like cups, tablespoons, teaspoons, fluid ounces, pints, quarts, gallons, milliliters, and liters measure the space an ingredient occupies. Weight units — grams, kilograms, ounces, and pounds — measure mass. The two systems sound interchangeable but are not: a cup of flour weighs about 125 grams while a cup of water weighs 240 grams, because each substance has a different density. Temperature units (Celsius, Fahrenheit, Kelvin) describe oven heat, and Gas Marks are a UK-specific scale used on older European ovens. Additionally, the US Customary system and the UK Imperial system use the same unit names for cups, pints, quarts, and gallons but define them differently — a US cup is 236.6 mL while a UK cup is 284.1 mL. This calculator handles both.

How Are Conversions Calculated?

Every volume unit is stored as its milliliter equivalent. To convert from one volume unit to another, the calculator multiplies the input by the 'from' unit's mL factor, then divides by the 'to' unit's mL factor. Weight works the same way using grams as the base. Cross-boundary conversions (volume to weight and vice versa) require the ingredient's density in g/mL. The formula is: weight (g) = volume (mL) × density, and volume (mL) = weight (g) ÷ density. Temperature conversions use the standard formulas: °F = (°C × 9/5) + 32, °C = (°F − 32) × 5/9, and K = °C + 273.15. Fraction inputs like '1/3' or '1 1/2' are parsed mathematically before calculation to ensure accuracy.

Why Accurate Conversions Matter

In cooking, especially baking, measurement precision directly affects the final result. Using too much flour because you confused US and UK cups can make a cake dense and dry. Converting a recipe weight to volume without accounting for ingredient density leads to wildly incorrect amounts — 1 cup of honey is nearly triple the weight of 1 cup of rolled oats. Temperature accuracy is equally critical: baking a cake at 180°C (356°F) versus 180°F (82°C) produces completely different results. Professional pastry chefs and recipe developers use weight measurements whenever possible precisely because volume measurements are less consistent. For home cooks without a kitchen scale, having a reliable density database makes volume-to-weight conversions much more dependable than generic approximations.

Limitations to Keep in Mind

Ingredient densities used in this calculator are standardized averages measured under typical conditions. Real-world densities can vary based on how an ingredient is packed (loosely spooned versus sifted versus firmly packed), humidity, brand differences, and even altitude. Brown sugar packed firmly can be 10–15% denser than loosely filled brown sugar. Bread flour from different mills absorbs moisture differently. For critical baking applications — especially gluten-free or high-altitude baking — always weigh ingredients directly with a digital kitchen scale for the most accurate results. The Gas Mark table rows represent approximate mid-points for each mark, and actual oven calibration varies. Always use an oven thermometer if precision is important. US and UK unit differences for cups, pints, quarts, and gallons are included; always confirm which system a recipe uses before converting.

Key Cooking Conversion Formulas

Cups to Milliliters

mL = cups × 236.588

One US cup equals 236.588 milliliters. Multiply the number of cups by 236.588 to convert to mL.

Tablespoons to Milliliters

mL = tbsp × 14.787

One US tablespoon equals 14.787 milliliters. This conversion is essential for measuring smaller liquid quantities in recipes.

Fahrenheit to Celsius

°C = (°F − 32) × 5/9

Subtract 32 from the Fahrenheit temperature, then multiply by 5/9 to convert to Celsius. Used for oven temperature conversions between US and metric recipes.

Celsius to Fahrenheit

°F = °C × 9/5 + 32

Multiply the Celsius temperature by 9/5 (or 1.8), then add 32 to convert to Fahrenheit.

Cooking Measurement Reference Tables

Common Volume Conversions

Quick reference for converting between US customary cooking volume units and milliliters.

US Measure	Equivalent	Milliliters (mL)
1 teaspoon (tsp)	⅓ tablespoon	4.929 mL
1 tablespoon (tbsp)	3 teaspoons	14.787 mL
1 fluid ounce (fl oz)	2 tablespoons	29.574 mL
¼ cup	4 tablespoons	59.147 mL
⅓ cup	5⅓ tablespoons	78.863 mL
½ cup	8 tablespoons	118.294 mL
1 cup	16 tablespoons	236.588 mL
1 pint	2 cups	473.176 mL
1 quart	4 cups	946.353 mL
1 gallon	16 cups	3,785.41 mL

Oven Temperature Conversions

Convert between Celsius, Fahrenheit, and Gas Mark for common baking and roasting temperatures.

Celsius (°C)	Fahrenheit (°F)	Gas Mark	Description
110°C	225°F	¼	Very Slow
130°C	250°F	½	Very Slow
140°C	275°F	1	Slow
150°C	300°F	2	Slow
170°C	325°F	3	Moderately Slow
180°C	350°F	4	Moderate
190°C	375°F	5	Moderately Hot
200°C	400°F	6	Hot
220°C	425°F	7	Hot
230°C	450°F	8	Very Hot
240°C	475°F	9	Very Hot

Worked Examples

Convert 250 mL of Milk to US Cups

A European recipe calls for 250 mL of whole milk. You need the equivalent in US cups.

Use the formula: cups = mL ÷ 236.588

cups = 250 ÷ 236.588 = 1.0567

Round to a practical measurement: approximately 1 cup + 1 tablespoon

250 mL of milk is approximately 1.06 US cups — just over 1 cup.

Scale a Recipe from 4 Servings to 6 Servings

A cake recipe for 4 servings calls for 1½ cups of flour and 2 tablespoons of butter. You want to scale it for 6 servings.

Calculate the scaling factor: 6 ÷ 4 = 1.5

Flour: 1.5 cups × 1.5 = 2.25 cups (2¼ cups)

Butter: 2 tbsp × 1.5 = 3 tablespoons

Optionally convert to metric: 2.25 cups × 236.588 = 532.3 mL (flour by volume), 3 tbsp × 14.787 = 44.4 mL (butter)

For 6 servings, use 2¼ cups (532 mL) of flour and 3 tablespoons (44.4 mL) of butter.

Convert Oven Temperature from 375°F to Celsius and Gas Mark

An American recipe says to preheat the oven to 375°F. You need Celsius and Gas Mark equivalents.

Use the formula: °C = (°F − 32) × 5/9

°C = (375 − 32) × 5/9 = 343 × 0.5556 = 190.6°C

Round to 190°C for practical use

Consult the Gas Mark table: 190°C / 375°F = Gas Mark 5

375°F equals approximately 190°C or Gas Mark 5 (Moderately Hot).

How to Use This Calculator

Choose a Measurement Category

Click one of the three tabs — Volume, Weight, or Temperature — to switch to the type of conversion you need. Volume covers cups, tablespoons, teaspoons, fluid ounces, pints, quarts, gallons, milliliters, and liters in both US and UK variants. Weight covers milligrams, grams, kilograms, ounces, and pounds. Temperature converts between Celsius, Fahrenheit, and Kelvin.

Enter Your Amount and Select Units

Type the amount you want to convert in the input field — decimals and fractions like '1/3' or '1 1/2' are both accepted. Use the quick-value buttons (1/4, 1/3, 1/2, 1, 2, 4) to fill common recipe amounts instantly. Then choose your 'Convert From' and 'Convert To' units from the dropdowns. Use the swap button (double arrow icon) to instantly reverse the direction of conversion.

Select an Ingredient for Weight-to-Volume Conversions

If you convert between volume and weight units (e.g., cups to grams), a density section will appear. Choose your ingredient from the 20-item dropdown — the tool will use its researched density value automatically. If your ingredient is not listed, check 'Use custom density instead' and enter the density in g/mL. This ensures accurate conversions since different ingredients have very different densities.

Read the Results and Multi-Unit Table

The primary converted value appears in large text at the top of the results panel. Below it, the full multi-unit table shows the equivalent in every common unit within the same category all at once. The bar chart gives a visual sense of relative unit sizes, with your selected units highlighted. For temperature, a heat-level gauge and the full Gas Mark reference table are displayed.

Frequently Asked Questions

Why does the calculator show an ingredient selector for some conversions?

Volume and weight are different types of measurement, so converting between them requires knowing how dense the ingredient is. One cup of water weighs 240 grams, but one cup of all-purpose flour weighs only about 125 grams — because flour is much less dense. The ingredient selector pre-fills the correct density (in grams per milliliter) for 20 common cooking and baking ingredients. If your ingredient is not listed, you can enter a custom density value. For pure volume-to-volume or weight-to-weight conversions, no density is needed and the selector stays hidden.

What is the difference between US and UK cups, pints, and gallons?

Despite sharing the same names, US Customary and UK Imperial volume units are not identical. A US cup equals 236.6 mL, while a UK cup equals 284.1 mL — about a 20% difference. Similarly, a US pint is 473.2 mL versus a UK pint of 568.3 mL, a US quart is 946.4 mL versus a UK quart of 1136.5 mL, and a US gallon is 3785.4 mL versus a UK gallon of 4546.1 mL. Teaspoons and tablespoons also differ slightly. Always check whether a recipe is using US or UK measurements before converting, especially for baking where precision matters most.

Can I enter fractions like 1/3 or 1 1/2 cup?

Yes. The calculator accepts both simple fractions (like '1/3' or '3/4') and mixed numbers (like '1 1/2' or '2 2/3'). Just type the fraction directly into the amount field using a forward slash for the fraction part and a space between the whole number and fraction portion. Decimals are also accepted. The parser converts these to a numeric value before performing the calculation, so '1/3' becomes 0.3333... and '1 1/2' becomes 1.5. The quick-value buttons can also fill common fractions like 1/4, 1/3, and 1/2 with a single tap.

What is a Gas Mark and how does it relate to Celsius and Fahrenheit?

Gas Mark is a temperature scale used on older gas ovens predominantly in the United Kingdom and Ireland. Each Gas Mark corresponds to a specific oven temperature: Gas Mark 4 is 350°F (177°C), which is a moderate baking temperature used for cakes, and Gas Mark 7 is 425°F (218°C), which is considered hot and used for roasting. Many British and Irish recipes specify Gas Marks instead of degrees, so the Temperature tab includes a full Gas Mark reference table from Mark 1/4 (225°F, very slow) to Mark 9 (475°F, very hot), and highlights the mark closest to your converted temperature.

How accurate are the ingredient density values?

The density values are carefully researched averages based on standardized cooking measurement methods — all-purpose flour measured by spooning and leveling, sugar poured without packing, butter at room temperature, and so on. In practice, density can vary by 10–20% depending on brand, humidity, packing method, and altitude. For example, sifted flour is significantly lighter than firmly scooped flour. For the most accurate results in critical baking applications such as bread, pastry, or gluten-free baking, use a digital kitchen scale to measure by weight directly rather than converting from volume. The density conversions here are best used for everyday cooking and recipe estimation.

How do I convert a full recipe from US to metric or UK measurements?

To convert a full recipe, work through each ingredient one at a time using the calculator. For volume ingredients like cups and tablespoons, use the Volume tab and select your 'from' and 'to' units. For weight ingredients like ounces and pounds, use the Weight tab. The multi-unit table shown after each conversion gives you the equivalent in every common unit simultaneously, saving repeated conversions. For baked goods, consider also using the weight-to-volume density conversion to shift from volume-based US measures to weight-based metric measures — most professional European recipes use grams for dry ingredients, which gives far more consistent results than volume measures.