How Much Moonshine From 5 Gallons of Mash?

Last Updated on August 19, 2026

One of the first questions I hear from people working with a 5-gallon batch is simple: how much moonshine can you actually get from 5 gallons of mash?

The frustrating answer is that 5 gallons of mash does not equal one fixed amount of finished spirit. What matters most is how much alcohol fermentation created before distillation ever begins.

As a simple example, 5 gallons of fermented mash at 10% alcohol by volume contains about half a gallon of pure alcohol in theory. If that alcohol were eventually represented as a 100-proof spirit—50% alcohol by volume—the mathematical maximum would be about 1 gallon before normal processing losses and separation.

In the real world, the amount of finished product will be lower because not everything in the fermented mash becomes usable finished spirit.

Quick Answer: For a 5-gallon mash, I would never estimate yield from the batch size alone. Measure the mash’s alcohol content first. A 5-gallon batch at 10% ABV contains roughly 0.5 gallon of pure alcohol before any processing losses.

Federal regulations define proof as “twice the percentage of ethyl alcohol by volume.” (1) That means 100 proof is 50% ABV, while 80 proof is 40% ABV.

How Much Liquor Do You Get From 5 Gallons of Mash?

The amount of liquor you can potentially get from 5 gallons of mash depends first on its starting alcohol percentage.

Here is an easy way I look at the numbers:

*These are mathematical maximums, not expected finished yields. Actual usable yield will be lower.

The important part is the distinction between alcohol present in the mash and finished spirit in a bottle.

Distillation does not create additional alcohol. Fermentation created the alcohol. The later process separates and concentrates what was already there.

That’s why I put so much emphasis on taking gravity readings instead of simply saying, “I have five gallons, so I should get X gallons back.”

If you want to understand that process better, read our guide on how to use a hydrometer.

What Factors Affect How Much Moonshine 5 Gallons of Mash Can Produce?

There are several variables that can move your final yield up or down.

Starting Alcohol

This is the big one.

Five gallons of mash at 6% ABV contains far less alcohol than five gallons at 12% ABV. The containers may look identical sitting next to each other, but what’s inside them is a completely different story.

Think of mash volume as the size of the mine and ABV as how much gold is actually buried inside it.

Fermentable Sugar

Yeast converts fermentable sugars into alcohol during fermentation. More available fermentable sugar can increase potential alcohol production, but simply dumping in more sugar does not guarantee a better fermentation.

Yeast has limits, and fermentation conditions matter.

University of Minnesota Extension notes that sugar concentration can be used to estimate potential alcohol production during fermentation, although the final result also depends on yeast and fermentation conditions. (2)

Yeast and Fermentation

If fermentation stalls or fails to use the available sugars, the potential yield falls with it.

This is why I prefer measurements over watching an airlock and guessing. Our hydrometer guide explains how starting and final gravity can be compared to estimate the alcohol created during fermentation.

Final Proof

Final proof changes the volume of finished spirit, but it does not magically create more ethanol.

A lower-proof finished product contains more water relative to alcohol, so the total liquid volume will be greater than the same amount of alcohol at a higher proof.

Collection and Processing Losses

The theoretical alcohol calculation is just that—theoretical.

Not every drop of alcohol originally present in fermented mash becomes finished, usable product. Normal separation, equipment losses, residue, and production decisions all reduce final yield.

That’s why I consider theoretical yield a ceiling, not a promise.

How Much Mash for a 5 Gallon Still?

A 5-gallon still and 5 gallons of mash are not necessarily the same thing.

If your equipment has a rated capacity of 5 gallons, that does not automatically mean it should be filled completely to the top. Foaming, expansion, still design, and manufacturer requirements can affect appropriate working capacity.

I always recommend following the operating capacity specified by the equipment manufacturer rather than assuming boiler capacity and usable charge volume are identical.

Mile Hi Distilling carries different sizes and styles of moonshine stills, so capacity should be considered alongside the type of equipment and what it was designed to do.

There is another issue that matters even more: legality.

The Alcohol and Tobacco Tax and Trade Bureau states:

“Federal law strictly prohibits individuals from producing distilled spirits at home.” (3)

Producing beverage spirits legally in the United States requires the appropriate federal qualification, and state or local requirements may also apply.

How Long Should Moonshine Mash Take to Ferment?

For the traditional corn mash in our main guide, we generally discuss fermentation in terms of about one to two weeks, but I don’t like using the calendar alone to decide whether fermentation is complete.

Two buckets can start on the same day and finish at different times.

Temperature, yeast performance, available sugar and other fermentation conditions can all affect how quickly the process moves.

A better approach is to look at what fermentation actually did.

A hydrometer measures the density of the liquid and lets you compare the mash before and after fermentation. That gives you an estimate of how much sugar was consumed and how much alcohol was produced.

That number is also what makes your 5-gallon yield estimate meaningful.

How Do You Know When Moonshine Mash Is Done Fermenting?

I look for stable gravity readings rather than relying only on bubbles.

Airlock activity can slow down or stop for several reasons, so a quiet airlock doesn’t automatically tell the whole story.

If the gravity reading remains stable over multiple readings and the mash has finished using the available fermentable sugars, you have a much better basis for determining that fermentation is complete.

More importantly for this article, you now have information you can use to estimate potential alcohol yield.

Without knowing the approximate ABV of the fermented mash, answering “how much moonshine will 5 gallons make?” is mostly guesswork.

Can You Let Moonshine Mash Sit Too Long?

Once fermentation is complete, leaving the mash sitting indefinitely does not create unlimited additional alcohol.

The yeast can only work with the fermentable material available to it. Once fermentation has finished, more waiting does not mean the alcohol percentage will simply keep climbing.

That’s another reason I recommend measuring fermentation rather than assuming a longer fermentation always produces more yield.

Does Moonshine Get Stronger the Longer It Sits?

No. Finished moonshine does not continue getting stronger just because it sits in a jar.

Alcohol strength is determined by the amount of alcohol relative to the total volume of liquid. Sitting on a shelf does not create additional ethanol.

That is different from barrel aging, where time can change flavor, aroma and other characteristics of a spirit.

What About 10 Gallons or 20 Gallons of Mash?

The same math scales up.

If two batches have the same ABV, then a 10-gallon batch contains approximately twice as much alcohol as a 5-gallon batch, while a 20-gallon batch contains approximately four times as much.

For example:

• 5 gallons at 10% ABV = 0.5 gallon of pure alcohol
• 10 gallons at 10% ABV = 1 gallon of pure alcohol
• 20 gallons at 10% ABV = 2 gallons of pure alcohol

Again, those numbers represent the alcohol theoretically present in the fermented liquid—not guaranteed finished product.

This is the easiest mistake to make when talking about yield. Mash volume tells me how much liquid you have. ABV tells me how much alcohol is actually hiding inside it.

Final Answer: How Much Moonshine Will 5 Gallons of Mash Make?

If you want to know how much moonshine from 5 gallons of mash you can expect, start by finding the mash’s alcohol percentage.

For a simple example, 5 gallons of fermented mash at 10% ABV contains approximately 0.5 gallon of pure alcohol. At 100 proof, the theoretical equivalent would be about 1 gallon of liquid before normal processing and collection losses.

Your real finished yield will depend on:

• Starting ABV
• Fermentation performance
• Final proof
• Equipment
• Normal separation and processing losses

So when someone asks me, “How much liquor will a 5 gallon still make?” my answer is always the same: tell me the ABV of the fermented mash first.

That number tells us far more than the size of the bucket.

For the complete process behind the mash discussed here, read our How to Make Moonshine: A Distiller’s Guide.

References

1. Electronic Code of Federal Regulations, 27 CFR Part 5 — Labeling and Advertising of Distilled Spirits, https://www.ecfr.gov/current/title-27/chapter-I/subchapter-A/part-5
2. University of Minnesota Extension, How to Measure Grape Cluster Ripeness, https://blog-fruit-vegetable-ipm.extension.umn.edu/2024/08/madeline-wimmer-extension-educator-and.html
3. Alcohol and Tobacco Tax and Trade Bureau, Home Distilling, https://www.ttb.gov/regulated-commodities/beverage-alcohol/distilled-spirits/penalties-for-illegal-distilling
4. Alcohol and Tobacco Tax and Trade Bureau, Distilled Spirits Permits, https://www.ttb.gov/regulated-commodities/beverage-alcohol/distilled-spirits/permits

About the Author

Kyle Doran

Kyle Doran is part of the Mile Hi Distilling team. Mile Hi Distilling has supplied stills, fermentation equipment, testing equipment and distilling supplies to customers for more than two decades. The team focuses on helping customers better understand distilling equipment, fermentation and responsible use.

Email: milehidistilling@yahoo.com
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