Brine Strength Adjuster
Fix a brine that came out too strong or too weak — find the water to add or the extra salt to dissolve in.
Percentages here are salt-in-water by weight, the same brine-only convention as the flagship calculator. Stir until fully dissolved and re-check the percentage on a scale before you re-use the brine.
How it works
Enter your current brine weight, the strength you actually measured or mixed it at, and the strength you want instead. If your target is weaker than what you have, the calculator works out how much plain water to stir in to dilute it. If your target is stronger, it works out how much extra salt to dissolve in instead. You never need both at once, since a single brine is either too strong or too weak, not both.
Worked example: you mixed 1000 g of brine at 3% by mistake and want it at 2%. The calculator takes 1000 × (3 ÷ 2 − 1), which comes out to 500 g of water to stir in. Check the other direction too: 1000 g of brine at 2% that you want at 3% needs 1000 × (3 − 2) ÷ 100, or 10 g of additional salt fully dissolved into the existing brine.
FAQ
Why would my brine come out too strong or too weak?
Usually a measuring mistake, using table salt with a different density than expected, or a recipe written for a different method (brine-only versus total-weight). Diluting or strengthening after the fact fixes the number without you having to toss the batch and start over.
Can I adjust a brine that vegetables are already sitting in?
Yes, though it's easier before you've packed the jar. If vegetables are already submerged, pour the brine off, adjust it separately, then pour it back over the same vegetables and re-weight them so everything stays submerged.
Is a slightly off percentage actually dangerous?
A percent or two above target is not a safety problem, just saltier than you might like. Going below 2% for vegetable ferments is the real concern, since that's the floor that keeps unwanted mold and spoilage organisms from getting the upper hand.
What if I don't know my current percentage?
If you didn't measure it when mixing, you likely used a recipe with a stated percent, so start from that number here. Without any record, the safest move is to remake the brine from scratch at a known ratio using the flagship brine calculator.
For the underlying salt math and why the 2% floor exists, see why salt matters in fermentation, and if the fix doesn't taste right afterward, check fixing a ferment that's too salty or too sour.