Volumetric flow rate.
Hectoliter per Days to Imperial gallons per Millisecond Converter — hL/d to imp gal/ms
Convert Hectoliter per Days (hL/d) to Imperial gallon per Millisecond (imp gal/ms) using the exact conversion factor (1 hectoliter per days = 2.54594e-7 imperial gallon per millisecond). See the formula, worked examples, and conversion table.
Hectoliter per Days to Imperial 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 1.15740741e-6 / 4.54609.
Flow rate uses cubic meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Hectoliter per Days to Imperial gallons per Millisecond
Hectoliter per Days and Imperial 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
imperial gallons per millisecond = hectoliter per days × 2.54594e-7
This factor comes from each unit's defined relationship to the category's base unit: 1 hectoliter per days equals 0.00000115740740741 base units, and 1 imperial gallon per millisecond equals 4.54609 base units, so dividing one by the other gives the direct hectoliter per days-to-imperial gallon per millisecond factor of 2.54594e-7.
Simple example
1 hL/d × 2.54594e-7 = 2.54594e-7 imp gal/ms
1 hectoliter per days = 2.54594e-7 imperial gallons per millisecond.
Real-world example
60 hL/d × 2.54594e-7 = 0.0000152756 imp gal/ms
60 hectoliter per days = 0.0000152756 imperial gallons per millisecond.
Conversion table
| Hectoliter per Days (hL/d) | Imperial gallon per Millisecond (imp gal/ms) |
|---|---|
| 0.1 hL/d | 2.54594e-8 imp gal/ms |
| 1 hL/d | 2.54594e-7 imp gal/ms |
| 10 hL/d | 0.0000025459 imp gal/ms |
| 60 hL/d | 0.0000152756 imp gal/ms |
| 100 hL/d | 0.0000254594 imp gal/ms |
| 1,000 hL/d | 0.000254594 imp gal/ms |
Reverse conversion: Imperial gallon per Millisecond to Hectoliter per Days
2.54594e-7 imp gal/ms × 3927821.76 = 0.9999998532 hL/d
2.54594e-7 imperial gallons per millisecond = 0.9999998532 hectoliter per days.
hectoliter per days = imperial gallons per millisecond × 3927821.76
For a page dedicated to this direction, see Imperial gallon per Millisecond to Hectoliter per Days.
Understanding the Hectoliter per Days (hL/d)
Volumetric flow rate.
Understanding the Imperial gallon per Millisecond (imp gal/ms)
Volumetric flow rate.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many imperial gallons per millisecond are in 1 hectoliter per days?
1 hectoliter per days equals 2.54594e-7 imperial gallons per millisecond, using the exact defined conversion factor rather than an estimate.
How do I convert hectoliter per days to imperial gallon per millisecond?
Multiply the hectoliter per days value by 2.54594e-7. The converter above does this instantly to whatever precision you set.
How do I convert imperial gallon per millisecond back to hectoliter per days?
Use the reverse factor: 1 imperial gallon per millisecond equals 3,927,821.76 hectoliter per days. You can also use the swap control in the converter above to flip the direction instantly.
What is a hectoliter per days?
Hectoliter per Days (hL/d) is a unit of flow rate.
What is a imperial gallon per millisecond?
Imperial gallon per Millisecond (imp gal/ms) is a unit of flow rate.
Is the hectoliter per days to imperial gallon per millisecond conversion exact?
Yes. Both hectoliter per days and imperial gallon per millisecond are defined by fixed standards rather than physical artifacts, so the factor of 2.54594e-7 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.