Cooking Conversion Calculator
Accepts decimals and fractions (e.g. 1/3, 1 1/2)
Enter a Value to Convert
Select your units and enter an amount above to see the converted result, a full multi-unit table, and a visual size comparison chart.
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.