Volumetric flow rate.
Hectoliter per Days to Gallons per Millisecond Converter — hL/d to gal/ms
Convert Hectoliter per Days (hL/d) to Gallon per Millisecond (gal/ms) using the exact conversion factor (1 hectoliter per days = 3.057547e-7 gallon per millisecond). See the formula, worked examples, and conversion table.
Hectoliter per Days 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 1.15740741e-6 / 3.785411784.
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 Gallons per Millisecond
Hectoliter per Days 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 = hectoliter per days × 3.057547e-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 gallon per millisecond equals 3.785411784 base units, so dividing one by the other gives the direct hectoliter per days-to-gallon per millisecond factor of 3.057547e-7.
Simple example
1 hL/d × 3.057547e-7 = 3.057547e-7 gal/ms
1 hectoliter per days = 3.057547e-7 gallons per millisecond.
Real-world example
60 hL/d × 3.057547e-7 = 0.0000183453 gal/ms
60 hectoliter per days = 0.0000183453 gallons per millisecond.
Conversion table
| Hectoliter per Days (hL/d) | Gallon per Millisecond (gal/ms) |
|---|---|
| 0.1 hL/d | 3.057547e-8 gal/ms |
| 1 hL/d | 3.057547e-7 gal/ms |
| 10 hL/d | 0.0000030575 gal/ms |
| 60 hL/d | 0.0000183453 gal/ms |
| 100 hL/d | 0.0000305755 gal/ms |
| 1,000 hL/d | 0.0003057547 gal/ms |
Reverse conversion: Gallon per Millisecond to Hectoliter per Days
3.057547e-7 gal/ms × 3270595.781 = 1.000000032 hL/d
3.057547e-7 gallons per millisecond = 1.000000032 hectoliter per days.
hectoliter per days = gallons per millisecond × 3270595.78138
For a page dedicated to this direction, see Gallon per Millisecond to Hectoliter per Days.
Understanding the Hectoliter per Days (hL/d)
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 hectoliter per days?
1 hectoliter per days equals 3.057547e-7 gallons per millisecond, using the exact defined conversion factor rather than an estimate.
How do I convert hectoliter per days to gallon per millisecond?
Multiply the hectoliter per days value by 3.057547e-7. The converter above does this instantly to whatever precision you set.
How do I convert gallon per millisecond back to hectoliter per days?
Use the reverse factor: 1 gallon per millisecond equals 3,270,595.781 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 gallon per millisecond?
Gallon per Millisecond (gal/ms) is a unit of flow rate.
Is the hectoliter per days to gallon per millisecond conversion exact?
Yes. Both hectoliter per days and gallon per millisecond are defined by fixed standards rather than physical artifacts, so the factor of 3.057547e-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.