Convert US gallons per minute to Cubic kilometres per year
Convert US gallons per minute (gpm) to Cubic kilometres per year (km³/yr) instantly and accurately.
Conversion Formula
km³/yr = gpm × 1.990975182e-6
About US gallons per minute
The US gallon per minute (gpm) equals 3.785411784×10⁻³/60 ≈ 6.309×10⁻⁵ m³/s, the dominant volumetric flow unit in US plumbing, HVAC, and water-treatment industries. EPA showerhead standards are set at 2.5 gpm; residential water meters size at 3/4"-1" for 5-20 gpm; municipal water-distribution design uses hundreds to thousands of gpm. 1 gpm ≈ 6.309×10⁻⁵ m³/s = 3.785 L/min.
About Cubic kilometres per year
The cubic kilometre per year (km³/yr) equals 10⁹/(365.25×86400) ≈ 31.688 m³/s, the unit used in global hydrology, glaciology, and climate science for river basin runoff, ice-sheet mass balance, and groundwater storage change. Total global freshwater river runoff is ≈37 000 km³/yr; the Amazon alone contributes ≈6 600 km³/yr; the Greenland ice sheet loses ≈280 km³/yr to melt and calving. 1 km³/yr ≈ 31.69 m³/s.
Quick Reference Table
| US gallons per minute (gpm) | Cubic kilometres per year (km³/yr) |
|---|---|
| 1 gpm | 1.991 × 10-6 km³/yr |
| 2 gpm | 3.982 × 10-6 km³/yr |
| 5 gpm | 9.955 × 10-6 km³/yr |
| 10 gpm | 1.991 × 10-5 km³/yr |
| 25 gpm | 4.977 × 10-5 km³/yr |
| 50 gpm | 9.955 × 10-5 km³/yr |
| 100 gpm | 0.000199098 km³/yr |