Unit Conversion

Volume Converter

Convert between millilitres, litres, cubic metres, cups, pints, quarts, gallons and fluid ounces.

Formula and sources updated · 2026-10-04Data sources · 1View algorithm, constants and default inputs (JSON)

Example

Decimal places

1 US gal = 3.785411784 L

About this calculator

Volume units with similar names are not always interchangeable: this converter distinguishes US and Imperial gallons. One US gallon is exactly 3.785411784 L; one Imperial gallon is 4.54609 L. The cup, pint, quart and fluid-ounce entries are US customary units.

Worked example

calculated with the default values below

Value 1 · From Litres (L) · To US gallons · Decimal places 4 Result 0.2642 · In litres 1.000000 L · In US gallons 0.264172 gal

Method and assumptions

Formula basis and scope

Convert liquid volume via litres; US and imperial gallons are distinct options.

US customary and imperial liquid measures differ. This is volume, not ingredient mass; no density conversion is performed.

Data sources

NIST SP 811 — Conversion factors by quantity

Disclaimer

These calculators give general conversion results. Rounding and the precision of the value you enter both affect the output, so treat displayed decimals as indicative rather than exact.

Maintained by: CalcDelta Formula and sources updated · 2026-10-04

Implementation source

This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.

View algorithm, constants and default inputs (JSON)

Formula and variables

L = x×F[from]÷F[to]

x: Value
from: Source unit
to: Target unit
F: Factor to litres
L: Result (L)

F to litres: ml 0.001, l 1, m³ 1000, cm³ 0.001, cup 0.2365882365, pt 0.473176473, qt 0.946352946, US gal 3.785411784, UK gal 4.54609, fl oz 0.0295735295625.

Embed this calculator

Copy the iframe snippet to place this calculator on your site. No account required. The snippet stays in sync with the inputs currently shown.

<iframe src="https://calcdelta.com/volume-calculator/" title="Volume Converter" loading="lazy" referrerpolicy="no-referrer-when-downgrade" style="width:100%;max-width:480px;height:720px;border:0;border-radius:12px;"></iframe>

Frequently asked questions

Why does the converter show different gallons for the UK and US?

The converter keeps US and UK gallons as separate units because they are not equal: one US gallon is 3.785 litres while one UK (imperial) gallon is 4.546 litres, about 20% more. Selecting galuk instead of gal changes the result for the same input, so a recipe or fuel figure quoted in imperial gallons will read lower in US gallons.