Volumetric flow rate.
Gallon per Minutes to Cubic inch per Seconds Converter — gal/min to in3/s
Convert Gallon per Minutes (gal/min) to Cubic inch per Seconds (in3/s) using the exact conversion factor (1 gallon per minutes = 3.85 cubic inch per seconds). See the formula, worked examples, conversion table, and common uses.
Gallon per Minutes to Cubic inch per Seconds converter
Converter
Flow Rate Converter
Convert volumetric flow rates across metric, US, imperial, industrial, and scientific units.
Context values
Some unit families need one extra value for a physically accurate result.
Volumetric flow rate.
Result = input x 6.30901964e-5 / 1.6387064e-5.
Flow rate uses cubic meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Gallon per Minutes to Cubic inch per Seconds
Gallon per Minutes and Cubic inch per Seconds both measure volumetric flow rate — how much volume passes a point over time — used to size pipes and pumps, monitor river or stream discharge, control industrial processes, and set medical infusion rates. Gallon per Minutes is most often used for us residential and commercial plumbing fixture flow ratings.
Formula
cubic inch per seconds = gallon per minutes × 3.85
This factor comes from each unit's defined relationship to the category's base unit: 1 gallon per minutes equals 0.0000630901964 base units, and 1 cubic inch per seconds equals 0.000016387064 base units, so dividing one by the other gives the direct gallon per minutes-to-cubic inch per seconds factor of 3.85.
Simple example
1 gal/min × 3.85 = 3.85 in3/s
1 gallon per minutes = 3.85 cubic inch per seconds.
Real-world example
60 gal/min × 3.85 = 231 in3/s
60 gallon per minutes = 231 cubic inch per seconds.
Conversion table
| Gallon per Minutes (gal/min) | Cubic inch per Seconds (in3/s) |
|---|---|
| 0.1 gal/min | 0.385 in3/s |
| 1 gal/min | 3.85 in3/s |
| 10 gal/min | 38.5 in3/s |
| 60 gal/min | 231 in3/s |
| 100 gal/min | 385 in3/s |
| 1,000 gal/min | 3,850 in3/s |
Reverse conversion: Cubic inch per Seconds to Gallon per Minutes
3.85 in3/s × 0.2597402597 = 1 gal/min
3.85 cubic inch per seconds = 1 gallon per minutes.
gallon per minutes = cubic inch per seconds × 0.25974025974
For a page dedicated to this direction, see Cubic inch per Seconds to Gallon per Minutes.
Understanding the Gallon per Minutes
Gallon per Minutes (gal/min) measures volumetric flow rate. The standard US unit for pump, plumbing, and irrigation flow-rate specifications. It is classified as a US customary flow-rate unit.
Where it's used: United States (plumbing, pump, and irrigation industry standard)
Uses of the Gallon per Minutes today
- US residential and commercial plumbing fixture flow ratings
- US pump and irrigation system specifications
- US pool and spa filtration system sizing
Understanding the Cubic inch per Seconds (in3/s)
Volumetric flow rate.
Gallon per Minutes — sources
- NIST Handbook 44 — General tables of units including US customary flow-rate measures.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many cubic inch per seconds are in 1 gallon per minutes?
1 gallon per minutes equals 3.85 cubic inch per seconds, using the exact defined conversion factor rather than an estimate.
How do I convert gallon per minutes to cubic inch per seconds?
Multiply the gallon per minutes value by 3.85. The converter above does this instantly to whatever precision you set.
How do I convert cubic inch per seconds back to gallon per minutes?
Use the reverse factor: 1 cubic inch per seconds equals 0.2597402597 gallon per minutes. You can also use the swap control in the converter above to flip the direction instantly.
What is a gallon per minutes?
Gallon per Minutes (gal/min) measures volumetric flow rate. The standard US unit for pump, plumbing, and irrigation flow-rate specifications. It is classified as a US customary flow-rate unit.
What is a cubic inch per seconds?
Cubic inch per Seconds (in3/s) is a unit of flow rate.
Is the gallon per minutes to cubic inch per seconds conversion exact?
Yes. Both gallon per minutes and cubic inch per seconds are defined by fixed standards rather than physical artifacts, so the factor of 3.85 used above is exact to as many digits as you choose to display.
Where is the gallon per minutes still used today?
United States (plumbing, pump, and irrigation industry standard)
What's the difference between volumetric and mass flow rate?
Volumetric flow rate measures the volume of fluid passing a point per unit time (for example, liters per second). Mass flow rate measures the mass instead. For a fluid of constant density the two are directly proportional, but for compressible fluids like gases, mass flow is often the more meaningful quantity.