Soft Wash Mix Calculator
Calculate batch size, sodium hypochlorite amount, water amount, and surfactant amount.
Formula
SH amount equals desired percentage divided by starting percentage, multiplied by batch size. Water amount equals batch size minus SH amount. Surfactant amount equals batch size multiplied by surfactant amount per unit.
Example calculation
For a 20 gallon batch using 12.5% starting SH and a 3% desired final mix, SH amount is 4.8 gallons and water amount is 15.2 gallons before surfactant.
Common mix warnings
Do not use a desired percentage higher than your starting SH percentage. Do not treat calculator math as safety guidance. Always verify labels, PPE, ventilation, storage, surface risk, and local rules before handling chemicals.
Related calculators
After estimating mix amounts, use the pricing and profit calculators to include materials, labor, overhead, and margin in the quote.
Safety disclaimer
This calculator is for math convenience only. It is not chemical safety training. Users must follow chemical labels, manufacturer instructions, PPE requirements, local laws, and professional safety practices. Do not mix chemicals unless you understand the risks and proper handling requirements.
Build quotes around your mix costs
Pair this mix calculator with pressure washing pricing and profit tools to understand both materials and margin.