Vinegar & Acid Dilution Calculator

Understanding the vinegar dilution calculator — concept and principle

Strong vinegars and vinegar concentrates are sold at acidities well above the usual 4–6 % of table vinegar. To make a dressing, a quick pickle or a cleaning solution at a particular strength you need to know how much concentrate to mix with how much water. This calculator gives both volumes for a chosen final volume and target acidity.

C₁V₁ = C₂V₂: 100 mL of 25% vinegar + 400 mL water = 500 mL at 5%.

How it is calculated

The dilution equation is C₁ × V₁ = C₂ × V₂.

C₁: acidity of the vinegar you have (%).
C₂: target acidity (%).
V₂: final volume you want (mL).

Vinegar needed V₁ = V₂ × C₂ ÷ C₁, and water = V₂ − V₁.

The principle

Adding water does not remove any acid; it only spreads the same amount of acetic acid through a larger volume. The amount of acid is concentration × volume, so it must be the same before and after diluting: C₁V₁ = C₂V₂. Vinegar acidity is normally stated as grams of acetic acid per 100 mL, and for dilute solutions the volumes of vinegar and water add up almost exactly, so the simple equation is accurate enough for the kitchen. In North America acidity is also written in "grain", which is ten times the percentage (50 grain = 5 %).

Worked example

Defaults: 25 % vinegar, 5 % target, 500 mL final.

Vinegar = 500 × 5 ÷ 25 = 100 mL.
Water = 500 − 100 = 400 mL.

Check: 100 mL × 25 % = 25 g acid; 25 g ÷ 500 mL = 5 %.

Each point is the calculator re-run with only “Vinegar acidity (%)” changed; the gold point is the default example. Change the inputs above and this chart follows your numbers.

Vinegar acidity (%)	Vinegar (mL)
6.25	400
12.5	200
18.8	133.33
25	100
31.2	80
37.5	66.67
50	50

How to read the result

Around 5 % is the strength of ordinary distilled or cider vinegar and is the standard assumed by tested canning recipes. Lower strengths, say 2–3 %, suit drinking vinegars or mild dressings. The ratio stays the same at any scale: one part 25 % concentrate to four parts water always gives 5 %.

Common mistakes

Assuming all vinegar is 5 %; rice, wine and fruit vinegars are often weaker.
Using the label's acidity of a blended "vinegar drink", which already includes sugar and water.
Diluting below the acidity a canning recipe requires.

Keep in mind: For home canning, use vinegar of the acidity the tested recipe specifies (usually at least 5 %) and never dilute the vinegar or change the vinegar-to-vegetable ratio, because low-acid pickles can be unsafe. Highly concentrated acetic acid (such as glacial acetic acid) is corrosive: wear eye protection, add acid to water and keep it away from children.

Frequently asked questions

Can I make 5 % vinegar stronger?

Not by mixing with water; you would need a stronger vinegar. The equation only works for dilution.

Does the type of vinegar matter for dilution?

The calculation is the same; flavour and colour differ.

Can I use this for lemon juice or citric acid?

For citric acid solutions made by weight, yes as a concentration ratio, but lemon juice acidity varies and is not interchangeable with vinegar in canning.

Sources: National Center for Home Food Preservation (USDA-supported) — pickling: vinegar acidity. · USDA Complete Guide to Home Canning, Guide 6: Preparing and Canning Fermented Foods and Pickled Vegetables.

Checked 8 Nov 2026. Typical coverage rates and standard formulas. Always check the product label and local building rules; buy 5–10% extra for waste.

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