Direct conversion
Convert gallon (US) per minute [gpm] to cubic inch per second [in3/s] instantly with formula, examples, chart, and FAQs.
1 gallon (US) per minute [gpm] = 3.85 cubic inch per second [in3/s]
1 gallon (US) per minute [gpm] = 3.85 cubic inch per second [in3/s]
Example: 1 gallon (US) per minute [gpm] equals 3.85 cubic inch per second [in3/s].
Flow rate conversions use cubic meter per second as the reference unit and include common pump, plumbing, HVAC, and process-flow units.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-08-14.
US gallons per minute measures volume flow rate in US liquid gallons each minute.
HistoryGPM developed from customary liquid volume measurement used in plumbing and pumping.
Current useGPM is used for faucets, pumps, fire protection, irrigation, pools, and water-treatment systems.
The cubic inch per second (in3/s) is a flow rate unit used to express measurements in this converter.
HistoryThis unit is included because it appears in practical measurement systems, technical references, product specifications, or everyday conversion needs.
Current useUse cubic inch per second when comparing flow rate values, checking specifications, converting between systems, or preparing quick estimates.
| gallon (US) per minute [gpm] | cubic inch per second [in3/s] |
|---|---|
| 1 | 3.85 |
| 2 | 7.7 |
| 5 | 19.25 |
| 10 | 38.5 |
| 20 | 77 |
| 25 | 96.25 |
| 50 | 192.5 |
| 100 | 385 |
| 1000 | 3850 |
Use this formula: 1 gallon (US) per minute [gpm] = 3.85 cubic inch per second [in3/s] Enter your value in the calculator and the result updates instantly.
1 gallon (US) per minute [gpm] equals 3.85 cubic inch per second [in3/s].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.