Pressure Washer Chemical Dilution Calculator
Work out how much chemical to add to hit a target dilution ratio for your tank size.
Chemical needed
How this calculator works
Downstream pressure washer injectors already dilute chemical automatically when you use their built-in metering, but many shop and vehicle-wash setups mix a specific ratio into a bottle or tank upfront instead. This calculator takes a target ratio (chemical to total mix) and your tank size, and gives the actual chemical volume to add.
Where these numbers come from
Standard dilution math (chemical volume equals total volume times the ratio). Always follow the specific chemical manufacturer's recommended ratio for your surface and soil level -- these common ratio presets are general starting points, not a substitute for the product label.
Frequently asked questions
Why would I mix a ratio manually instead of using the injector?
Some pressure washers don't have a downstream injector, or a specific job calls for a stronger or weaker mix than the injector's fixed ratio allows -- premixing in a bottle or tank gives direct control.
Is 1:30 a safe default ratio?
It's a common general-purpose starting point, but always check your specific chemical's label -- some products are formulated for a much stronger or weaker ratio, and using the wrong one can damage a surface or simply waste chemical.
Does this work for car wash soap as well as degreaser?
Yes -- the math is the same regardless of chemical type; just use the ratio recommended on your specific product's label rather than assuming one of these presets fits every chemical.
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