Kitchen Conversions
Kitchen conversions are practical, but not all of them are the same kind of measurement. This guide separates exact US liquid volume factors from rounded cooking equivalents and explains when weight-based ingredient data is needed.
Key distinction
Volume is not weight
Cups and milliliters measure volume. Grams and ounces measure mass, so ingredient density matters.
Exact and practical liquid measure equivalents
| US liquid measure | Exact metric equivalent | Common kitchen rounding |
|---|---|---|
| 1 US teaspoon | 4.92892159375 mL | 5 mL |
| 1 US tablespoon | 14.78676478125 mL | 15 mL |
| 1 US fluid ounce | 29.5735295625 mL | 30 mL |
| 1 US cup | 236.5882365 mL | 240 mL |
| 1 US liquid pint | 473.176473 mL | 475 mL |
| 1 US liquid quart | 946.352946 mL | 950 mL |
| 1 US liquid gallon | 3.785411784 L | 3.8 L |
Use exact factors for records
Exact liquid factors are best for published recipes, labels, batch sheets, and conversions that will be reused.
Round only when the recipe allows it
A rounded tablespoon or cup is practical in a kitchen, but rounding choices become more visible in large batches.
Weigh dry ingredients
Dry ingredients need density-specific data. A cup of flour, sugar, oil, and honey does not weigh the same.
Recipe conversions you can audit
| Recipe amount | Exact converted value | Practical measuring note |
|---|---|---|
| 2 tbsp olive oil | 29.5735295625 mL | 30 mL |
| 3/4 cup stock | 177.441177375 mL | 180 mL |
| 1.5 cups milk | 354.88235475 mL | 355 mL |
| 2 quarts broth | 1.892705892 L | 1.9 L |
When scaling recipes, convert liquid quantities into milliliters or liters, apply the scaling multiplier, then convert back into the measuring tool that will be used. For baking and dry goods, use grams when possible because volume can change with scooping, settling, and ingredient density.
Kitchen conversion questions
Should I use exact or rounded kitchen conversions?
Use exact conversions when publishing recipes, scaling large batches, comparing labels, or documenting a formula. Use rounded kitchen equivalents when the recipe is tolerant and the measuring tools are ordinary spoons or cups. Small rounding choices can become noticeable when a batch is multiplied many times.
Does this guide convert grams to cups?
No. Grams measure mass and cups measure volume. The relationship depends on ingredient density, packing, grind size, humidity, and measurement technique. A cup of flour and a cup of honey have very different weights, so density-specific tables are needed for mass-to-volume conversions.
Why do some recipes say 1 cup is 240 mL?
Many recipes use a practical rounded metric value because 240 mL is easier to measure and remember than 236.5882365 mL. That rounding is usually acceptable for casual cooking but should be identified when precision matters.
Are US cups and metric cups the same?
No. A US customary cup is about 236.588 mL, while a metric cup is commonly 250 mL in countries that use metric recipe measures. Always check the recipe origin before scaling cup-based ingredients.
What is the safest method for scaling a recipe?
Convert each liquid amount into a base metric unit, multiply by the scaling factor, then convert back to the measuring unit you plan to use. For dry ingredients and baking formulas, weighing ingredients is usually more reliable than volume conversion.
Conversion references used
Exact factors in the converter follow standard US liquid measure relationships and SI metric volume units. Practical rounded values are included as cooking notes, not as a replacement for exact documentation.