Volumetric flow rate.
Imperial gallon per Seconds to Hectoliters per Millisecond Converter — imp gal/s to hL/ms
Convert Imperial gallon per Seconds (imp gal/s) to Hectoliter per Millisecond (hL/ms) using the exact conversion factor (1 imperial gallon per seconds = 0.0000454609 hectoliter per millisecond). See the formula, worked examples, and conversion table.
Imperial gallon per Seconds to Hectoliters 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 0.00454609 / 100.
Flow rate uses cubic meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Imperial gallon per Seconds to Hectoliters per Millisecond
Imperial gallon per Seconds and Hectoliter 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
hectoliters per millisecond = imperial gallon per seconds × 0.0000454609
This factor comes from each unit's defined relationship to the category's base unit: 1 imperial gallon per seconds equals 0.00454609 base units, and 1 hectoliter per millisecond equals 100 base units, so dividing one by the other gives the direct imperial gallon per seconds-to-hectoliter per millisecond factor of 0.0000454609.
Simple example
1 imp gal/s × 0.0000454609 = 0.0000454609 hL/ms
1 imperial gallon per seconds = 0.0000454609 hectoliters per millisecond.
Real-world example
60 imp gal/s × 0.0000454609 = 0.002727654 hL/ms
60 imperial gallon per seconds = 0.002727654 hectoliters per millisecond.
Conversion table
| Imperial gallon per Seconds (imp gal/s) | Hectoliter per Millisecond (hL/ms) |
|---|---|
| 0.1 imp gal/s | 0.0000045461 hL/ms |
| 1 imp gal/s | 0.0000454609 hL/ms |
| 10 imp gal/s | 0.000454609 hL/ms |
| 60 imp gal/s | 0.002727654 hL/ms |
| 100 imp gal/s | 0.00454609 hL/ms |
| 1,000 imp gal/s | 0.0454609 hL/ms |
Reverse conversion: Hectoliter per Millisecond to Imperial gallon per Seconds
0.0000454609 hL/ms × 21996.92483 = 1 imp gal/s
0.0000454609 hectoliters per millisecond = 1 imperial gallon per seconds.
imperial gallon per seconds = hectoliters per millisecond × 21996.9248299
For a page dedicated to this direction, see Hectoliter per Millisecond to Imperial gallon per Seconds.
Understanding the Imperial gallon per Seconds (imp gal/s)
Volumetric flow rate.
Understanding the Hectoliter per Millisecond (hL/ms)
Volumetric flow rate.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many hectoliters per millisecond are in 1 imperial gallon per seconds?
1 imperial gallon per seconds equals 0.0000454609 hectoliters per millisecond, using the exact defined conversion factor rather than an estimate.
How do I convert imperial gallon per seconds to hectoliter per millisecond?
Multiply the imperial gallon per seconds value by 0.0000454609. The converter above does this instantly to whatever precision you set.
How do I convert hectoliter per millisecond back to imperial gallon per seconds?
Use the reverse factor: 1 hectoliter per millisecond equals 21,996.92483 imperial gallon per seconds. You can also use the swap control in the converter above to flip the direction instantly.
What is a imperial gallon per seconds?
Imperial gallon per Seconds (imp gal/s) is a unit of flow rate.
What is a hectoliter per millisecond?
Hectoliter per Millisecond (hL/ms) is a unit of flow rate.
Is the imperial gallon per seconds to hectoliter per millisecond conversion exact?
Yes. Both imperial gallon per seconds and hectoliter per millisecond are defined by fixed standards rather than physical artifacts, so the factor of 0.0000454609 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.