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If you cook or bake with cannabis, you've probably had to convert volume measurements to get your desired edible servings and dose. Converting milliliters (ml) to gallons (gal) or vice versa is expected when making cannabis-infused edibles, tinctures, and topicals.

This volume conversion guide covers the difference between milliliters and gallons, shows you how to convert between the two, and answers frequently asked questions about milliliter conversions. Now, let's find out how many milliliters are in a gallon.

TL;DR (Too Long; Didn’t Read): There are 3,785.411784 milliliters in one gallon.

What Is Liquid Volume?

When cooking with cannabis, you will use a broad range of wet and dry ingredients. Liquid ingredients such as milk, juice, oil, and water are commonly measured with measuring cups and spoons when following a recipe.

Liquid volume is the amount of space a liquid takes up in a container and can be measured with metric, US customary, and UK imperial units of measurement.

  • Metric: Milliliter (ml), centiliter (cl), liter (l), and kiloliter (kl)
  • US customary: Fluid ounce (fl), cup (c), pint (pt), quart (qt), and liquid gallon (gal)
  • UK imperial: Fluid ounce (fl), cup (c), pint (pt), quart (qt), and liquid gallon (gal)

You may notice that US customary and UK imperial measurement systems use the same units of measurement. However, there is a difference in amount between US customary and UK imperial units of measurement. We will go more in-depth below.

Metric, US Customary, and UK Imperial Measurements

Did you know that the United States uses the customary measurement system based on the UK imperial system? In contrast, most of the world uses the International System of Units, also known as the metric system.

The US and UK systems use the same units of measurement (fl, c, pt, qt, gal), but there is a difference between the volume measurements. The number of gallons, quarts, fluid ounces, and pints is larger in the imperial system. For example, a US liquid gallon is 128 fluid ounces, while one imperial gallon equals 160 fluid ounces. 

Some liquid products will include the US customary and metric values. For example, a 16-fluid-ounce bottle of cooking oil equals 473 milliliters, 0.124953 gallons, and 0.473 liters.

When cooking or baking with cannabis, you may need to convert milliliters to gallons. The conversion process requires converting a metric unit (milliliter) into a US customary unit (gallon) of volume. We’ll show you how to convert between the two below.

What Is a Milliliter?

A milliliter, abbreviated as ml, is a unit of volume in the metric system of measurement. A milliliter is “a unit of capacity equal to 1/1000 liter,” 1/1,000,000 cubic meters, or one cubic centimeter.

A milliliter’s base unit is the liter or spelled “litre” in the metric system. “Litre” was part of the French metric system and derived from “litron,” an old version of the French litre.

Today, milliliters are used to measure the amount of liquid in small containers, such as cans, medicine, perfume, toothpaste, and shampoo. Milliliters can be measured with measuring cups, graduated cylinders, pipettes, and beakers. 

What Is a Gallon?

A gallon, abbreviated as gal, is a unit of liquid volume in the imperial and the US customary measurement systems. A US gallon is “a unit of liquid capacity equal to 231 cubic inches [3.785 liters] or 4 quarts.”

The imperial gallon is used in the United Kingdom, Canada, and certain Caribbean countries. It is defined as 4.54609 liters. Like a US gallon, an imperial gallon is a unit of fluid volume equal to four quarts. One quart is equal to two pints, and each pint is equivalent to two cups.

In the US, liquid gallons are used to measure large containers, such as milk, water, fuel, paint, storage containers, aquariums, and coolers. The imperial gallon is not used as often as the US liquid gallon. For example, most countries use litres to measure fuel.

How Many Milliliters Are in a Gallon?

If you’re cooking or baking cannabis, you will likely need to use milliliter and gallon units of volume. One US liquid gallon is equal to 3,785.411784 milliliters.

Milliliters = (Amount of gallons) x 3785.411784

How Many Gallons Are in a Milliliter?

One milliliter is equal to 0.00026417205 gallons.

Gallons = (Amount of milliliters) ÷ 3785.411784

How to Convert Milliliters to Gallons

Converting milliliters to liquid gallons is simple. There are 3,785.411784 milliliters in a gallon. To convert milliliters to gallons, divide the milliliter value by 3,785.411784 to determine the equivalent value in gallons.

Use this formula when converting milliliters to gallons:

Gallons = Milliliters ÷ 3,785.411784


1 ÷ 3,785.411784 = 0.00026417205 gallons

5 ÷ 3,785.411784 = 0.00132086026 gallons

10 ÷ 3,785.411784 = 0.00264172052 gallons

20 ÷ 3,785.411784 = 0.00528344104 gallons

25 ÷ 3,785.411784 = 0.0066043013 gallons

How to Convert Gallons to Milliliters

If you’re trying to convert large amounts of liquid capacity to smaller amounts, you may need to convert gallons to milliliters. Since there are 3,785.411784 milliliters in a gallon, you can multiply the gallon value by this value to convert gallons into milliliters.

Use this formula when converting gallons to milliliters:

Milliliters: Gallons x 3,785.411784


1 gallon x 3,785.411784 = 3,785.411784 gallons

2 gallons x 3,785.411784 = 7,570.823568 gallons

5 gallons x 3,785.411784 = 18,927.05892 gallons

10 gallons x 3,785.411784 = 37,854.11784 gallons

20 gallons x 3,785.411784 = 75,708.23568 gallons

How to Convert Gallons and Milliliters to Other Units of Volume

Cooking with cannabis may require you to convert between several units of volume, not just gallons and milliliters. You may be dealing with teaspoons, tablespoons, cups, pints, fluid ounces, and quarts.

If you are regularly in the kitchen cooking with cannabis, use this handy chart to quickly convert between milliliters and gallons.

 1 US Gallon1 Milliliter
Fluid ounces1280.033814

Milliliter-to-Gallon Conversion Table

Converting milliliters to gallons is simple with our handy milliliter-to-gallon conversion table.

Milliliter (ml)Gallons (gal)
1 ml0.00026417205 gal
2 ml0.0005283441 gal
3 ml0.00079251615 gal
4 ml0.0010566882 gal
5 ml0.00132086026 gal
6 ml0.00158503231 gal
7 ml0.00184920436 gal
8 ml0.00211337641 gal
9 ml0.00237754847 gal
10 ml0.00264172052 gal
11 ml0.00290589257 gal
12 ml0.00317006462 gal
13 ml0.00343423668 gal
14 ml0.00369840873 gal
15 ml0.00396258078 gal
16 ml0.00422675283 gal
17 ml0.00449092489 gal
18 ml0.00475509694 gal
19 ml0.00501926899 gal
20 ml0.00528344104 gal

Gallon to Milliliter Conversion Table

Are you looking for a simple way to convert gallons to milliliters? Check out our gallon-to-milliliters conversion table below.

Gallons (gal)Milliliter (ml)
1 gal3,785.411784 ml
2 gal7,570.823568 ml
3 gal11,356.235352 ml
4 gal15,141.647136 ml
5 gal18,927.05892 ml
6 gal22,712.470704 ml
7 gal26,497.882488 ml
8 gal30,283.294272 ml
9 gal34,068.706056 ml
10 gal37,854.11784 ml
11 gal41,639.529624 ml
12 gal45,424.941408 ml
13 gal49,210.353192 ml
14 gal52,995.764976 ml
15 gal56,781.17676 ml
16 gal60,566.588544 ml
17 gal64,352.000328 ml
18 gal68,137.412112 ml
19 gal71,922.823896 ml
20 gal75,708.23568 ml

Things That Are Measured in Milliliters

One milliliter is measured in a small instrument, such as a pipette or beaker. Milliliters are sometimes used in the US for several reasons:

  • Liquid medicine
  • Beverages
  • Perfume
  • Liquid makeup
  • Toothpaste

If a liquid is measured in another unit of volume, you can convert that unit to milliliters using the correct ml-gallon conversion formula.

How to Measure Milliliters and Gallons

Measure gallons and milliliters using measuring cups, teaspoons, and tablespoons, and then use the appropriate conversion formula to determine the milliliter equivalent. You can also use a pipette made from food-grade materials for your cannabis cooking or baking. 

FAQs About Milliliter to Gallon Conversions

Converting milliliters to gallons can be difficult without a calculator or ml conversion formula. Here are some of the most frequently asked questions about liquid volume conversions relating to milliliters and gallons.

How Many ml in a Gallon?

There are 3785.41 milliliters in a gallon.


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How Many Milliliters in a Gallon of Water?

There are 3,785.411784 milliliters in a gallon of water.

How Many Milliliters in a Gallon of Milk?

There are 3,785.411784 milliliters in a gallon of milk.

How Many Milliliters in a Half Gallon?

There are 1,892.705892 milliliters in a half gallon.

How Many Milliliters in 5 Gallons?

There are 18,927.05892 milliliters in 5 gallons.

How Many ml in 55 Gallons?

There are 208,197.64812 milliliters in 55 gallons.

How Many Gallons in a Cup?

There are 0.0625 gallons in one US cup.

How Many Milliliters in an Ounce?

There are 29.5735 milliliters in one US fluid ounce.

How Many 250 ml in 1 Gallon?

There is 15.14 250-ml per US gallon.

How Many Milliliters Are In 2 Teaspoons?

There are 9.85784 in 2 US teaspoons.

How Much Is 2000 ml in Gallons?

Two-thousand milliliters is equal to 0.5283441 US liquid gallons.

2.5 Milliliters to Teaspoon: How Many Teaspoons Is 2.5 Milliliters?

There are 0.507211 teaspoons in 2.5 milliliters.

How Many Teaspoons Is 10 ml?

Ten milliliters equals 2.02884 US teaspoons.

2 Gallon to ml: How Many Milliliters Is 2 Gallons?

There are 7,570.823568 milliliters in 2 gallons.

750 ml to Gallons: How Many Gallons Is 750 ml?

There are 0.198129 gallons in 750 milliliters.

12.5 ml to Tsp: How Many Teaspoons Is 12.5 ml?

There are 2.536053 teaspoons in 12.5 milliliters.

50 ml to Tsp: How Many Teaspoons Is 50 ml?

There are 10.1442 teaspoons in 50 milliliters.

5 ml Equals How Many Teaspoons?

Five milliliters is equal to 1.01442 US teaspoons.

3 ml to Oz: How Many Ounces Is 3 ml?

There are 0.101442 US fluid ounces in 3 milliliters.

2 ml to Tsp: How Many Teaspoons Is 2 ml?

There are 0.405768 teaspoons in 2 milliliters.

How Many ml Is Half a Teaspoon?

Half a teaspoon equals 2.46446 milliliters.

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2 ml to Oz: How Many Ounces Is 2 ml?

There are 0.067628 US fluid ounces in 2 milliliters.

12.5 ml to Tsp: How Many Teaspoons Is 12.5 ml?

There are 2.536053 teaspoons in 12.5 milliliters.

30 ml to Tsp: How Many Teaspoons Is 30 ml?

There are 6.08653 teaspoons in 30 milliliters.

.25 ml to Tsp: How Many Teaspoons Is .25 ml?

There are 0.0507211 teaspoons in .25 milliliters.

4 ml to Tsp: How Many Teaspoons Is 4 ml?

There are 0.811537 teaspoons in 4 milliliters.

15 ml to Tsp: How Many Teaspoons Is 15 ml?

There are 3.04326 teaspoons in 15 milliliters.

500 ml to Gallons: How Many Gallons Is 500 ml?

There are 0.13208602617 gallons in 500 milliliters.

Final Thoughts on How Many Milliliters Are in a Gallon

Converting milliliters to gallons or vice versa can be easy. Just follow our handy formulas or conversion charts to get your recipe rights. Whether you are baking cannabis-infused edibles or gummies, knowing how to convert between different units of measurement is vital. 

Learn more about cooking with cannabis, growing weed at home, and extracting cannabis oils safely by enrolling in CTU’s Master of Cannabis Certification Program.

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