Convert US gallons per day to Cubic inches per second
Convert US gallons per day (gpd) to Cubic inches per second (in³/s) instantly and accurately.
Conversion Formula
in³/s = gpd × 0.002673611111
About US gallons per day
The US gallon per day (gpd) equals 3.785411784×10⁻³/86400 ≈ 4.381×10⁻⁸ m³/s, the standard unit in US water-utility regulation and residential water-well pump sizing. The US national average residential water use is about 80-100 gpd per person; a reverse-osmosis membrane module is rated in gpd (50-100 gpd for domestic units). 1 US gpd ≈ 4.381×10⁻⁸ m³/s.
About Cubic inches per second
The cubic inch per second (in³/s) equals 1.6387064×10⁻⁵ m³/s, used in US automotive engineering for engine displacement sweep rate, fuel-injector calibration, and hydraulic actuator speed specifications. An engine injector delivering 15 in³/s of fuel corresponds to roughly 15.5 mL/s; hydraulic jacks in US equipment are rated in in³/s at operating pressure. 1 in³/s ≈ 1.639×10⁻⁵ m³/s = 0.016387 L/s.
Quick Reference Table
| US gallons per day (gpd) | Cubic inches per second (in³/s) |
|---|---|
| 1 gpd | 0.00267361 in³/s |
| 2 gpd | 0.00534722 in³/s |
| 5 gpd | 0.0133681 in³/s |
| 10 gpd | 0.0267361 in³/s |
| 25 gpd | 0.0668403 in³/s |
| 50 gpd | 0.133681 in³/s |
| 100 gpd | 0.267361 in³/s |