Must Weight Converter

Summary

Enter any must weight value — Brix, SG, Oechsle, KMW, or Baume — and instantly see all other scales plus estimated potential ABV.

How it works

1. Select the scale you are working with (Brix, SG, Oechsle, KMW, or Baume).
2. Enter the value measured from your must sample.
3. The converter recalculates all remaining scales in real time.
4. Brix is used as the internal reference; other scales are derived via standard formulas.
5. SG is calculated from Brix using the NBS polynomial: SG = 1 + Brix / (258.6 − Brix / 258.2 × 227.1).
6. Oechsle equals (SG − 1) × 1000; KMW ≈ Brix × 0.84; Baume ≈ Brix × 0.55.
7. Potential ABV is estimated as Brix × 0.55 (rough rule of thumb, assumes near-complete fermentation).

Use cases

• Convert a refractometer Brix reading to Oechsle when following a German wine recipe.
• Check KMW for Austrian harvest regulations from a Brix field measurement.
• Estimate potential ABV from any scale before fermentation.
• Compare French Baume readings with US Brix measurements in the same cellar.
• Quickly verify must weight targets when sourcing grapes from different regions.
• Translate SG from a hydrometer into all regional winemaking scales at once.

Frequently Asked Questions