Sugar Calculator for Wine: How Much Sugar to Add

Most fruit juices, and grapes in a cool year, do not carry enough sugar to make a stable wine on their own, so home winemakers add sugar before fermentation. This is called chaptalization. Measure the juice with a hydrometer, decide on the starting gravity you want, and the calculator below tells you how much table sugar to stir in.

It works in US gallons or liters and gives the answer in pounds and grams, along with the potential alcohol at your target gravity.

Sugar to add calculator

Batch size Current gravity Target gravity

0.65 lbtable sugar to add

295 gthe same in grams

12.1%potential alcohol at the target gravity

How the Sugar Calculator Works

Brewers describe sugar by how many gravity “points” it adds: one pound dissolved into a total of one US gallon. In Brewer’s Friend’s fermentables database, cane sugar is listed at 46 points per pound per gallon, which means one pound of table sugar made up to one gallon of liquid raises the gravity by about 0.046.

So the calculator does three steps:

Points needed = (target gravity − current gravity) × 1,000.
Pounds of sugar = points needed × gallons ÷ 46.
Grams = pounds × 453.6.

The result lines up with the rule of thumb in North Dakota State University Extension’s Getting Started With Home Winemaking (FN1638): 11 grams of sugar per liter of must raises the gravity by 0.004. At 46 points per pound per gallon, 11 grams per liter works out to just over four points, the same answer.

Why you should add it in stages

Dissolved sugar takes up space, so a gallon of juice plus sugar ends up a little more than a gallon, and the gravity rises slightly less than the arithmetic says. NDSU’s guide recommends adding sugar in small amounts and checking the gravity again so you do not overshoot. A practical routine: dissolve about nine tenths of the calculated amount in some warm juice, stir it in, take a new reading, and add the rest only if you still need it.

What gravity to aim for

Clemson Cooperative Extension’s basics of home winemaking fact sheet says wines should start between 1.070 and 1.100, and the higher the starting gravity, the higher the alcohol. NDSU’s fruit recipes in FN1638 aim for 1.090 to 1.095. The University of Georgia Extension’s Winemaking at Home (C717) targets 22% sugar, about 1.092, and notes that wines need 11% alcohol to resist bacterial spoilage. Our Brix converter turns any of these into the other scale.

Worked Examples

One gallon of juice at 1.060

You want 1.090. That is 30 points. 30 × 1 ÷ 46 = 0.65 pounds, or about 296 grams. Add roughly 265 grams first, stir until it is completely dissolved, read again, then add the balance.

Five gallons of fruit must at 1.050

Same target, 40 points short: 40 × 5 ÷ 46 = 4.35 pounds, about 1.97 kilograms. Dissolve the sugar in a couple of quarts of warm must rather than water so you do not dilute the batch.

Starting from water

Some country wines, such as flower wines, start from water plus a little fruit. Going from 1.000 to 1.090 in one gallon needs 90 × 1 ÷ 46 = 1.96 pounds, just under two pounds. Fruit and juice in the recipe supply some of those points, so measure first rather than adding the full amount blind.

Quick Sugar Chart

Pounds of table sugar to raise the gravity by the number of points shown, at 46 points per pound per gallon. Multiply by 453.6 for grams.

Points to add	1 gallon	3 gallons	5 gallons	6 gallons
10 (for example 1.080 to 1.090)	0.22 lb	0.65 lb	1.09 lb	1.30 lb
20	0.43 lb	1.30 lb	2.17 lb	2.61 lb
30	0.65 lb	1.96 lb	3.26 lb	3.91 lb
40	0.87 lb	2.61 lb	4.35 lb	5.22 lb
50	1.09 lb	3.26 lb	5.43 lb	6.52 lb

Other sugars

Corn sugar (dextrose), honey and syrups each have their own figure. If you use them, look up their points per pound per gallon in the same Brewer’s Friend database and divide by that number instead of 46. With honey, which is a natural product and less uniform than refined sugar, add it in stages and measure as you go.

Common Mistakes

Measuring before the sugar has dissolved

Undissolved crystals sink and the sample reads low, which tempts you to add more. Stir until the liquid is clear of crystals, wait a minute for bubbles to rise, then read.

Adding sugar to a fermenting wine by the same arithmetic

Once fermentation has started, the gravity no longer reflects only sugar, because alcohol is lighter than water. Do all the chaptalization before the yeast goes in, or add in small steps and accept that the target will be approximate.

Chasing a very high starting gravity

More sugar is not always more alcohol. Every yeast has an alcohol tolerance, listed on its data sheet, and a must that goes past it stops fermenting sweet. Check the strain on our wine yeast guide before you plan a starting gravity above about 1.110.

Forgetting to record the reading

Your starting gravity after the sugar is the original gravity you will need later for the ABV calculator. Write it down before the yeast goes in.

To measure before and after adding sugar

1Hydrometer and test jar

Brewer's Elite Triple Scale Hydrometer and Plastic Test Jar

Reads specific gravity, potential alcohol and Brix on one stem, with a test jar, case and cleaning cloth included, per the listing.

Check price on Amazon

How much sugar for specific gravity?

Each pound of table sugar dissolved into one US gallon adds about 46 gravity points, or 0.046. To raise one gallon from 1.060 to 1.090 you need 30 points, so 30 divided by 46, about 0.65 pounds. For other batch sizes multiply by the number of gallons, or use the calculator above.

How much sugar to make 1 gallon of wine?

It depends on the sugar already in your fruit or juice, so measure first. Starting from water, reaching 1.090 takes just under 2 pounds per gallon. A juice that already reads 1.050 needs only about 0.9 pounds to reach the same target. Add it in stages and re-check the gravity.

Does adding more sugar make wine stronger?

Only up to the alcohol tolerance of the yeast. Below that point, more sugar means more alcohol, at roughly 0.13% for every gravity point the yeast ferments. Past the tolerance, fermentation stops and the extra sugar stays in the wine as sweetness, which can also leave it prone to refermenting in the bottle.

Should I dissolve the sugar in water or juice?

Use some of the juice or must, warmed gently, when you can. Dissolving sugar in water dilutes the flavor and the acidity of the batch. If a recipe tells you to make a sugar syrup with water, count that water as part of the batch volume when you calculate how much sugar you need.

Brix to specific gravity converter.
Wine ABV calculator.
How to use a hydrometer for wine.
How to make homemade wine from fruit, where adding sugar is part of almost every recipe.