Baking Soda to Washing Soda Converter

Enter how much baking soda you have. Get estimated washing soda yield after oven conversion (mass factor ×0.631).

Baking soda amount

Washing soda yield

Estimated yield —

Same unit —

Uses mass conversion factor ×0.631 (NaHCO₃ → Na₂CO₃ water loss). Volume units are converted via common DIY density (~220 g per cup baking soda).

Oven tip: Spread baking soda in a thin layer. Bake at about 400°F (~200°C) for about 1 hour. Weigh before and after — when mass drops to roughly 63% of the start weight, conversion is done. Cool completely before storing in an airtight container.

Disclaimer: DIY estimate only — not a lab assay. Washing soda (sodium carbonate) is alkaline and can irritate skin and eyes. Wear gloves and eye protection; keep away from children and pets. Do not ingest. Use at your own risk. This tool is not affiliated with any brand.