Bottling & Carbonation

Priming Sugar

A small, measured dose of sugar added at bottling to carbonate the brew in the bottle.

Priming Sugar — original illustration

Original illustration — a generic example of this tool, not a specific product.

Specifications

Category
Bottling & Carbonation
Type
Plain white cane sugar, or a purpose-made priming sugar
Typical dose
About 1 tsp (4 g) per gallon for a lightly sparkling result
Target range
Roughly 1.5–3.0 volumes of CO₂, dissolved in the bottle
Method
Dissolve fully in a little warm water, cool, then mix gently into the brew
Consistency
Measure by weight, not by eye
Avoid
Adding sugar to bottles that are already carbonated, or to a brew not yet at target pH
Typical batch size
Roughly 4–8 g per gal depending on target carbonation

Priming Sugar

A small, measured dose of sugar added at bottling to carbonate the brew in the bottle.

Priming sugar is the sugar you add right before bottling. It gives the culture a final small amount of food so that the sealed bottle generates carbon dioxide, which dissolves into the liquid as carbonation. The dose is small — measured in grams rather than cups — and getting it consistent is the difference between a reliably fizzy bottle and a bottle that fails.

carbonation measurement second fermentation
Best for
Bottling
Batch size
Roughly 4–8 g per gal depending on target carbonation

Applicable brewing stages

  • First Fermentation
  • Second Fermentation
  • Flavoring
  • Bottling
  • Cleaning & Testing

A highlighted stage means this tool has a direct role at that point in the process. Ticking several stages is normal — a thermometer, for example, is useful during both the first and second fermentation.

Safety notes

Priming sugar is the point where most over-carbonation happens, and over-carbonation is a genuine injury risk. Do not exceed the recommended dose, do not add sugar to a brew that is still sweet from the first fermentation, and never prime bottles individually by guesswork, because a bottle with twice the dose can fail. Confirm the brew has reached a pH below 4.5 and has largely finished its first fermentation before you bottle. Store conditioning bottles inside a closed box or cupboard, away from people, and chill before opening.

Practical guidance

  • Weigh the sugar on a small scale; a teaspoon of sugar varies more than people expect.
  • Dissolve the sugar in a cup of warm water first so it mixes evenly through the batch.
  • Reduce the dose if you are flavourings with fruit, since fruit adds its own sugar.
  • Give bottles two to four days at room temperature, then refrigerate to slow the process.

Please read before you brew

This page is educational reference material, not professional brewing, food-safety or medical advice. Equipment handling, hygiene practice and local rules vary, and nothing here guarantees a particular brewing result.

  • Home brewing rules differ by country, state, province and municipality, and they change over time. Check your own local requirements — including any permit, licence, volume limit or minimum age — before you brew, bottle or share what you make.
  • Use food-grade equipment only. Vessels, bottles, tubing and utensils that were not made for food or drink may release unwanted compounds or shelter microbes.
  • Work in a well-ventilated space, keep hot liquids away from children and pets, and follow the manufacturer's instructions for every appliance you use.
  • Bottles under pressure can fail. Use bottles designed for carbonated drinks, do not over-prime, and refrigerate once the carbonation is right.
  • For anything involving gas pressure, electricity, high heat, chemical cleaners or acids, consult a qualified professional.

Finished kombucha contains trace alcohol and caffeine. It is not suitable for children, and anyone who is pregnant, breastfeeding, immunocompromised, diabetic or taking medication should speak to a healthcare professional before drinking it. Kombucha is a food, not a medicine, and it does not treat, cure or prevent any disease.

Related tools and guides