How many liters are in a US liquid gallon?

1 US gallon is defined as exactly 3.785411784 liters (231 cubic inches).

How does an Imperial gallon differ from a US gallon?

An Imperial (UK) gallon is 4.54609 liters, approximately 20% larger than a US liquid gallon (3.78541 L).

How many milliliters are in 1 US cup?

1 standard US legal cup equals approximately 236.588 milliliters.

How many US tablespoons are in a US cup?

There are 16 US tablespoons in 1 US cup — useful when scaling a recipe up or down without measuring cups on hand.

Why is a UK (imperial) gallon bigger than a US gallon?

The two systems were standardized separately: the US gallon (3.785 L) is based on an old English wine gallon, while the imperial gallon (4.546 L) was redefined in 1824 based on the volume of 10 pounds of water — about 20% larger.

Volume Converter

Instant, precise volume converter with live formula explanations and interactive lookup tables.

TL;DR: Volume Converter performs exact deterministic conversion across volume units with zero server latency.

PRESETS:

FROM

SLIDER: 10

PRECISION:

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Mathematical Formula

Reference Conversion Table

From	To

Why Use This Tool?

Volume Converter switches between metric, US customary, imperial, and cooking volume units instantly — useful for following recipes, reading container sizes, and comparing fuel or liquid capacities across unit systems.

How to Use the Volume Converter

This converter uses exact international metrology factors to deliver accurate and reliable conversions right inside your web browser. Choose your starting unit and target unit, then type a value — the conversion updates instantly.

Unit	Equal to (in liters)
1 Milliliter (mL)	0.001 L
1 Cubic Meter (m³)	1,000 L
1 US Gallon	3.785412 L
1 US Cup	0.236588 L
1 Imperial Gallon (UK)	4.54609 L
1 US Tablespoon	0.014787 L

Mathematical Formula & Methodology

Here is the standard mathematical equation used to calculate this result accurately:

V_{\text{target}} = V_{\text{source}} \times \frac{\text{Factor}_{\text{source}}}{\text{Factor}_{\text{target}}}

Formula Variables Explained:
Three-dimensional capacity conversion based on cubic meters ($m^3$) and liters ($L$).

Step-by-Step Worked Example

Converting 2 US Gallons to Liters: $2 \text{ gal} \times 3.78541 \text{ L/gal} = 7.57082 \text{ L}$.

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All processing runs locally inside your browser using JavaScript and HTML5 APIs. Your data, files, and inputs are never uploaded to any remote server. Complete privacy by design.

Frequently Asked Questions

: 1 US gallon is defined as exactly 3.785411784 liters (231 cubic inches).
: An Imperial (UK) gallon is 4.54609 liters, approximately 20% larger than a US liquid gallon (3.78541 L).
: 1 standard US legal cup equals approximately 236.588 milliliters.
: There are 16 US tablespoons in 1 US cup — useful when scaling a recipe up or down without measuring cups on hand.
: The two systems were standardized separately: the US gallon (3.785 L) is based on an old English wine gallon, while the imperial gallon (4.546 L) was redefined in 1824 based on the volume of 10 pounds of water — about 20% larger.

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