Brine

2.5% brine — lightly-salted vegetable brine

25 g salt per litre of water

Brine calculator

For submerged vegetables (cucumbers, peppers, cauliflower, garlic scapes). Salt mass is expressed as a percentage of water mass — NCHFP convention.

1 L of water ≈ 1 kg. 3.5% brine = 35 g salt per litre.

%
35g salt
for 1000 ml of water · 6.15 tsp · 2.05 tbsp · 1.23 oz

Based on Fine sea salt at 5.69 g/tsp.

Safe pickle brine. 3.5% is the most common starting point for cucumbers and peppers.

Safety at 2.5%

Refrigerator pickles only. 2.5% is below the NCHFP safety floor for room-temperature fermentation. Suitable for short-term brine-pickling in the refrigerator — do not ferment at room temperature past 2 weeks.

Technique at 2.5%

25g fine sea salt or pickling salt per 1000g (1L) water. Dissolve fully before pouring. Not a long-term preservation brine — refrigerate within 7 days of starting ferment. Too dilute for room-temp storage past 2 weeks.

Typical use

short-ferment brine-pickle, fridge-pickle, lightly-salted vegetables for snacking. Peppers, radish sticks, carrots for quick-turn consumption.

Frequently asked questions

How much salt for 2.5% brine?

2.5% brine = 25g salt per litre of water. For 2 litres: 50g salt. For 500ml: 12.5g salt. Multiply water volume in grams by 0.025 to calculate. Use non-iodised salt.

Is 2.5% brine safe for fermentation?

2.5% is below the NCHFP safety floor for room-temperature fermentation. Use for refrigerator pickles only — do not ferment at room temperature past 2 weeks. Standard countertop ferments require 2-3% brine minimum.

What vegetables work with 2.5% brine?

24 vegetables are compatible: green cabbage, jalapeño pepper, mixed hot peppers, daikon radish, carrot, red beet, and 18 more. Each has its own default salt range — see per-vegetable pages for fermentation time and pH targets.

What is 2.5% brine typically used for?

short-ferment brine-pickle, fridge-pickle, lightly-salted vegetables for snacking. Peppers, radish sticks, carrots for quick-turn consumption.

Vegetables at 2.5% brine

24 vegetables are commonly fermented in 2.5% brine. Each page gives timing at 68 °F, pH target, and species-specific technique.

All brine percentages

Sources

Brine percentage guidance from the National Center for Home Food Preservation (NCHFP), USDA Complete Guide to Home Canning (2015 rev.), and Linda Ziedrich, The Joy of Pickling (3rd ed., 2016). Information is provided for educational purposes. Consult your local food safety authority for commercial production.