Volumetric flow rate.
Gallon per Seconds to Quarts per Millisecond Converter — gal/s to qt/ms
Convert Gallon per Seconds (gal/s) to Quart per Millisecond (qt/ms) using the exact conversion factor (1 gallon per seconds = 0.004 quart per millisecond). See the formula, worked examples, and conversion table.
Gallon per Seconds to Quarts per Millisecond 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 0.003785411784 / 0.946352946.
Flow rate uses cubic meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Gallon per Seconds to Quarts per Millisecond
Gallon per Seconds and Quart per Millisecond 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. Both are volumetric flow rate units.
Formula
quarts per millisecond = gallon per seconds × 0.004
This factor comes from each unit's defined relationship to the category's base unit: 1 gallon per seconds equals 0.003785411784 base units, and 1 quart per millisecond equals 0.946352946 base units, so dividing one by the other gives the direct gallon per seconds-to-quart per millisecond factor of 0.004.
Simple example
1 gal/s × 0.004 = 0.004 qt/ms
1 gallon per seconds = 0.004 quarts per millisecond.
Real-world example
60 gal/s × 0.004 = 0.24 qt/ms
60 gallon per seconds = 0.24 quarts per millisecond.
Conversion table
| Gallon per Seconds (gal/s) | Quart per Millisecond (qt/ms) |
|---|---|
| 0.1 gal/s | 0.0004 qt/ms |
| 1 gal/s | 0.004 qt/ms |
| 10 gal/s | 0.04 qt/ms |
| 60 gal/s | 0.24 qt/ms |
| 100 gal/s | 0.4 qt/ms |
| 1,000 gal/s | 4 qt/ms |
Reverse conversion: Quart per Millisecond to Gallon per Seconds
0.004 qt/ms × 250 = 1 gal/s
0.004 quarts per millisecond = 1 gallon per seconds.
gallon per seconds = quarts per millisecond × 250
For a page dedicated to this direction, see Quart per Millisecond to Gallon per Seconds.
Understanding the Gallon per Seconds (gal/s)
Volumetric flow rate.
Understanding the Quart per Millisecond (qt/ms)
Volumetric flow rate.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many quarts per millisecond are in 1 gallon per seconds?
1 gallon per seconds equals 0.004 quarts per millisecond, using the exact defined conversion factor rather than an estimate.
How do I convert gallon per seconds to quart per millisecond?
Multiply the gallon per seconds value by 0.004. The converter above does this instantly to whatever precision you set.
How do I convert quart per millisecond back to gallon per seconds?
Use the reverse factor: 1 quart per millisecond equals 250 gallon per seconds. You can also use the swap control in the converter above to flip the direction instantly.
What is a gallon per seconds?
Gallon per Seconds (gal/s) is a unit of flow rate.
What is a quart per millisecond?
Quart per Millisecond (qt/ms) is a unit of flow rate.
Is the gallon per seconds to quart per millisecond conversion exact?
Yes. Both gallon per seconds and quart per millisecond are defined by fixed standards rather than physical artifacts, so the factor of 0.004 used above is exact to as many digits as you choose to display.
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.