Winemaking
Sulfite Addition Calculator
Estimate SO2-equivalent, KMS grams, and tablet counts for a target free SO2 increase.
Use this for careful cellar records
Sulfite additions are small but important, so the calculation should be explicit and repeatable. This tool helps translate batch size and target adjustment into a practical addition amount for planning and record keeping.
- Know whether you are working with free SO2, molecular SO2, or a product-rate target.
- Measure pH and current SO2 where possible before deciding an addition.
- Mix thoroughly and retest after the addition has had time to integrate.
How It Works
This calculator estimates sulfite additions to increase free SO2 to a chosen target.
- Enter wine volume plus current and target free SO2 levels.
- Set KMS SO2 strength and tablet weight assumptions.
- Review SO2-equivalent requirement, grams KMS, and tablet estimate.
FAQ
Does free SO2 stay constant after addition?
Not always. Binding reactions can reduce free SO2 after dosing.
Is free SO2 the same as total SO2?
No. Free SO2 is the active protective fraction; total includes bound forms.
Should I verify analytically after dosing?
Yes. Re-testing is recommended to confirm actual achieved free SO2.