Volumetric flow rate.
Quart per Seconds to Gallons per Millisecond Converter — qt/s to gal/ms
Convert Quart per Seconds (qt/s) to Gallon per Millisecond (gal/ms) using the exact conversion factor (1 quart per seconds = 0.00025 gallon per millisecond). See the formula, worked examples, and conversion table.
Quart per Seconds to Gallons 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 0.000946352946 / 3.785411784.
Flow rate uses cubic meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Quart per Seconds to Gallons per Millisecond
Quart per Seconds and Gallon 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
gallons per millisecond = quart per seconds × 0.00025
This factor comes from each unit's defined relationship to the category's base unit: 1 quart per seconds equals 0.000946352946 base units, and 1 gallon per millisecond equals 3.785411784 base units, so dividing one by the other gives the direct quart per seconds-to-gallon per millisecond factor of 0.00025.
Simple example
1 qt/s × 0.00025 = 0.00025 gal/ms
1 quart per seconds = 0.00025 gallons per millisecond.
Real-world example
60 qt/s × 0.00025 = 0.015 gal/ms
60 quart per seconds = 0.015 gallons per millisecond.
Conversion table
| Quart per Seconds (qt/s) | Gallon per Millisecond (gal/ms) |
|---|---|
| 0.1 qt/s | 0.000025 gal/ms |
| 1 qt/s | 0.00025 gal/ms |
| 10 qt/s | 0.0025 gal/ms |
| 60 qt/s | 0.015 gal/ms |
| 100 qt/s | 0.025 gal/ms |
| 1,000 qt/s | 0.25 gal/ms |
Reverse conversion: Gallon per Millisecond to Quart per Seconds
0.00025 gal/ms × 4000 = 1 qt/s
0.00025 gallons per millisecond = 1 quart per seconds.
quart per seconds = gallons per millisecond × 4000
For a page dedicated to this direction, see Gallon per Millisecond to Quart per Seconds.
Understanding the Quart per Seconds (qt/s)
Volumetric flow rate.
Understanding the Gallon per Millisecond (gal/ms)
Volumetric flow rate.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many gallons per millisecond are in 1 quart per seconds?
1 quart per seconds equals 0.00025 gallons per millisecond, using the exact defined conversion factor rather than an estimate.
How do I convert quart per seconds to gallon per millisecond?
Multiply the quart per seconds value by 0.00025. The converter above does this instantly to whatever precision you set.
How do I convert gallon per millisecond back to quart per seconds?
Use the reverse factor: 1 gallon per millisecond equals 4,000 quart per seconds. You can also use the swap control in the converter above to flip the direction instantly.
What is a quart per seconds?
Quart per Seconds (qt/s) is a unit of flow rate.
What is a gallon per millisecond?
Gallon per Millisecond (gal/ms) is a unit of flow rate.
Is the quart per seconds to gallon per millisecond conversion exact?
Yes. Both quart per seconds and gallon per millisecond are defined by fixed standards rather than physical artifacts, so the factor of 0.00025 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.