Wine Making

Potassium Metabisulfite Calculator

Calculate a first-pass K-meta addition from batch volume and the desired free-SO₂ increase, using an approximate 57% available-SO₂ yield.

Enter your measurements

Estimate a potassium metabisulfite mass for a chosen free-SO₂ increase.

Good to know

Does this replace pH-based sulfite planning?

No. The desired free-SO₂ level depends on pH and wine style; use measured pH and trusted winemaking guidance.

Should I verify the result?

Yes. Dissolve and add carefully, then allow mixing and measure free SO₂ again.

Keep exploring

Guide

Understand the difference between pH and titratable acidity and why bench trials matter.

Calculator

Estimate a sugar addition to raise wine must to a target specific gravity.

Calculator

Estimate a tartaric-acid addition to move measured titratable acidity toward a target.

Calculator

Estimate potassium metabisulfite needed for a free-SO₂ target adjustment.

Calculator

Estimate the finished wine volume needed to fill a chosen number of bottles.