Volume & Liquid Measurement Converter — 15 Units

1 liter = 0.2642 US gallons, 1 cup = 236.6 mL. Convert volume & liquid capacity between 15 units — metric, US customary, imperial & cooking measurements. Free online converter, 100% private, runs in your browser.

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Volume

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All conversion factors verified against NIST Handbook 44 and tested for roundtrip accuracy across all 15 supported units. — Go Tools Engineering Team · Mar 18, 2026

Quick Reference

How Many Milliliters in a Cup?

1 US cup = 236.588 mL This is based on the US customary system. For cooking, rounding to 240 mL is accurate enough. The metric cup (Australia) is exactly 250 mL.

How Many Liters in a Gallon?

1 US gallon = 3.785 liters A US gallon is exactly 3.785411784 liters. An Imperial gallon is 4.54609 liters. Always specify which gallon system you mean.

How Many Teaspoons in a Tablespoon?

1 tablespoon = 3 teaspoons This is an exact ratio in the US customary system. Other useful ratios: 1 cup = 16 tablespoons, 1 fluid ounce = 2 tablespoons.

How Many Tablespoons in a Cup?

1 cup = 16 tablespoons Also equals 48 teaspoons or 8 fluid ounces. Half cup = 8 tbsp, quarter cup = 4 tbsp.

How Many Milliliters in a Fluid Ounce?

1 US fl oz = 29.574 mL Imperial fl oz is slightly smaller at 28.413 mL. For a quick estimate, use 30 mL.

Volume Conversion Formulas

Mathematical formulas for the most common volume conversions, with worked examples.

Liters to US Gallons

gallons = liters ÷ 3.785411784

gallons = liters × 0.264172

10 liters →

10 ÷ 3.785411784
= 2.64172

= 2.64172 US gallons

Cups to Milliliters

mL = cups × 236.5882365

mL ≈ cups × 240 (cooking approximation)

2 cups →

2 × 236.5882365
= 473.177

= 473.177 mL

US Gallons to Liters

liters = gallons × 3.785411784

5 US gallons →

5 × 3.785411784
= 18.927

= 18.927 liters

Fluid Ounces to Milliliters

mL = fl oz × 29.57352956

mL ≈ fl oz × 30 (quick estimate)

12 fl oz →

12 × 29.57352956
= 354.882

= 354.882 mL

Teaspoons to Milliliters

mL = tsp × 4.92892

mL ≈ tsp × 5 (cooking approximation)

6 teaspoons →

6 × 4.92892
= 29.574

= 29.574 mL

Cups to Fluid Ounces

fl oz = cups × 8

2.5 cups →

2.5 × 8
= 20

= 20 fl oz

What Is a Volume Unit Converter?

A volume unit converter is a tool that translates capacity and volume measurements between different units of measure. It bridges metric (milliliters, liters, cubic meters), US customary (cups, pints, quarts, gallons, fluid ounces), Imperial (Imperial gallons, Imperial fluid ounces), and cubic measurements (cubic inches, cubic feet).

The metric system defines volume through the liter, where 1 liter = 1,000 milliliters = 1 cubic decimeter. The US customary system uses a hierarchy: 1 gallon = 4 quarts = 8 pints = 16 cups = 128 fluid ounces. The Imperial system (used in the UK) shares some unit names with the US system but with different sizes — an Imperial gallon is about 20% larger than a US gallon.

Cooking measurements add further complexity: US recipes use cups, tablespoons, and teaspoons, while most of the world measures by weight (grams) or metric volume (milliliters). This converter handles all these systems, including the often-confused distinction between US and Imperial fluid ounces (29.57 mL vs 28.41 mL).

All conversions use the exact factors defined by NIST and are calculated entirely in your browser — no data is transmitted to any server.

// Key volume conversion factors:
// 1 liter     = 1000 mL
// 1 US gallon = 3785.411784 mL
// 1 US cup    = 236.588 mL
// 1 US fl oz  = 29.5735 mL
// 1 US tbsp   = 14.787 mL
// 1 US tsp    = 4.929 mL

// JavaScript conversion examples:
const litersToGallons = (l) => l / 3.785411784;
const cupsToMl = (cups) => cups * 236.5882365;
const tbspToTsp = (tbsp) => tbsp * 3;

console.log(litersToGallons(3.785));  // ~1.0
console.log(cupsToMl(2));             // 473.176
console.log(tbspToTsp(3));            // 9

Key Features of This Volume Converter

15 Volume Units Supported

Convert between milliliter, liter, cubic meter, US gallon, quart, pint, cup, fluid ounce, tablespoon, teaspoon, Imperial gallon, Imperial fluid ounce, cubic centimeter, cubic inch, and cubic foot.

Instant Real-Time Conversion

Results update as you type — no need to click a convert button. Change units and see the result immediately.

Grouped Unit Selector

Units are organized into Metric, US Customary, Imperial, and Cubic groups for quick selection.

US vs Imperial Distinction

Clearly separates US customary and Imperial units, preventing the common confusion between US gallons (3,785 mL) and Imperial gallons (4,546 mL).

Cooking-Friendly Units

Includes tablespoons, teaspoons, cups, and fluid ounces — the units you actually need for recipe conversion.

100% Browser-Based & Private

All calculations happen locally in your browser. No server requests, no tracking, no data storage — your values never leave your device.

Volume Conversion Examples

Liters to US Gallons — Fuel Economy

3.785

1 gal

One US gallon equals exactly 3.785411784 liters. This conversion is essential for comparing fuel economy between countries using liters per 100 km and miles per gallon.

Cups to Milliliters — Recipe Conversion

473.176 mL

Two US cups equal approximately 473.18 milliliters. Cooking measurements often require converting between US cups and metric mL, especially when following international recipes.

Fluid Ounces to Milliliters — Beverage Sizing

354.882 mL

A standard 12 fl oz can equals about 354.88 milliliters. In the US, beverages are labeled in fluid ounces, while most other countries use milliliters.

Imperial Gallons to US Gallons — Cross-System

1.20095 gal (US)

One Imperial gallon is about 20% larger than a US gallon (4,546 mL vs 3,785 mL). This distinction matters when interpreting fuel consumption data between the UK and the US.

Cubic Feet to Liters — Aquarium Volume

141.584 L

A 5 cubic foot container holds approximately 141.6 liters. This conversion is useful for aquarium sizing, HVAC calculations, and shipping container volumes.

Tablespoons to Teaspoons — Cooking Basics

9 tsp

Three tablespoons equal exactly 9 teaspoons (1 tbsp = 3 tsp). This is one of the most common conversions in everyday cooking and baking.

How to Convert Common Volume Units

Quick reference for the most popular volume unit conversions between metric, US customary, and Imperial systems.

How to Convert Liters to US Gallons

Liter (L) → US Gallon (gal)

Divide the number of liters by 3.785411784 to get US gallons. For example, 10 liters = 2.642 US gallons. This conversion is commonly needed for fuel economy comparisons and beverage sizing.

10 L → 2.642 gal

For a quick estimate, divide liters by 4 and add 10% — that gives a rough approximation of US gallons.