Convert between liters, gallons, cups, milliliters, fluid ounces, tablespoons, and more.
A cup is not a cup: the US customary cup holds 236.59 mL, the metric cup holds 250 mL, and recipes rarely say which one they mean. This tool converts between liters, gallons, cups, milliliters, fluid ounces, and tablespoons; enter a value in one unit and read the result in any other. The conversions rest on the fixed definitions of each unit against the liter, not on estimates. The surprise most people hit: a US fluid ounce and a UK fluid ounce are different volumes, and a US gallon holds 3.79 L while a British one holds 4.55 L, so check which system the result assumes before pouring.
A concrete input and expected output from the current implementation.
Input
2 cups in milliliters
Expected output
473.18 mL
One US customary cup is one-sixteenth of a US gallon, 236.588 mL, so two cups come to 473.176 mL, which rounds to 473.18 mL. A 250 mL metric cup would give 500 mL instead, so the answer depends on which cup the conversion assumes.
Every unit in the list has an exact definition in terms of the liter, so converting between any two units is one multiplication, not an approximation. The US gallon is defined as exactly 3.785411784 L and the imperial gallon as exactly 4.54609 L; the US cup is one sixteenth of the US gallon (236.59 mL) and the US fluid ounce is one one-hundred-twenty-eighth of it (29.57 mL).
Gallons, pints, and fluid ounces exist in both US customary and British imperial with different sizes: an imperial gallon is about 20 percent larger than a US gallon and an imperial fluid ounce about 4 percent smaller than a US fluid ounce. A result is only correct for the system its units belong to, and mixing systems is the most common source of wrong answers.
Both exist. The US customary cup is 236.59 mL, the US legal cup used on nutrition labels is 240 mL, and the metric cup of 250 mL is used in Australia and many international cookbooks. Most recipes do not say which they assume, so for baking, weigh ingredients in grams instead when the recipe allows.
In the United States a tablespoon is half a fluid ounce, 14.79 mL. Many countries treat it as 15 mL, and Australia uses 20 mL. The difference is usually harmless in cooking but not in anything precise; use the tablespoon definition that matches where the recipe or label came from.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
Create customizable checklists with groups, due dates, and priorities for any project.
Design a printable daily planner with time blocks, goals, and priority sections.
Measure your typing speed in WPM and accuracy with real-time feedback and stats.
Pomodoro timer with built-in ambient noise (rain, cafe, forest) generated via Web Audio API oscillators.
Stay focused with a customizable Pomodoro timer featuring work and break intervals.
A precise stopwatch with lap tracking, split times, and exportable results.