Measures the water flow volume. Higher GPM allows you to clean larger areas faster.

The effectiveness of a pressure washer is determined by two main ratings:

Calculated as PSI × GPM , this is the truest measure of overall cleaning speed. Cleaning Task Recommended PSI Light Duty (Cars, furniture, windows) 1,300–2,000 Medium Duty (Siding, fences, decks) 2,000–2,800 Heavy Duty (Driveways, paint stripping) 2,900–3,300+ Top Electric Pressure Washer Recommendations (2026) 6 Best Pressure Washer 2026