Convert US gallons per hour to US gallons per second
Convert US gallons per hour (gph) to US gallons per second (gal/s) instantly and accurately.
Conversion Formula
gal/s = gph × 0.0002777777778
About US gallons per hour
The US gallon per hour (gph) equals 3.785411784×10⁻³/3600 ≈ 1.051×10⁻⁶ m³/s, common in oil-burner nozzle ratings, water-softener regeneration, and RV/marine-plumbing specifications. Residential oil-burner nozzles are rated in gph (e.g., 0.75 gph, 1.00 gph); a small boat bilge pump might handle 200-500 gph. 1 US gph ≈ 1.052×10⁻⁶ m³/s ≈ 3.785 L/h.
About US gallons per second
The US gallon per second (gal/s) equals 3.785411784×10⁻³ m³/s, used for very large pump discharge rates and fire-suppression deluge systems. A large centrifugal fire pump rated 1 500 US gal/min delivers exactly 25 US gal/s; industrial cooling-tower makeup lines are sized in gal/s at peak demand. 1 US gal/s = 3.785411784×10⁻³ m³/s = 60 US gal/min ≈ 227.1 L/min.
Quick Reference Table
| US gallons per hour (gph) | US gallons per second (gal/s) |
|---|---|
| 1 gph | 0.000277778 gal/s |
| 2 gph | 0.000555556 gal/s |
| 5 gph | 0.00138889 gal/s |
| 10 gph | 0.00277778 gal/s |
| 25 gph | 0.00694444 gal/s |
| 50 gph | 0.0138889 gal/s |
| 100 gph | 0.0277778 gal/s |