Volumetric flow rate.
Imperial gallon per Days to Gallons per Millisecond Converter — imp gal/d to gal/ms
Convert Imperial gallon per Days (imp gal/d) to Gallon per Millisecond (gal/ms) using the exact conversion factor (1 imperial gallon per days = 1.389988e-8 gallon per millisecond). See the formula, worked examples, and conversion table.
Imperial gallon 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 5.26167824e-8 / 3.785411784.
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 Days to Gallons per Millisecond
Imperial gallon 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 = imperial gallon per days × 1.389988e-8
This factor comes from each unit's defined relationship to the category's base unit: 1 imperial gallon per days equals 5.261678e-8 base units, and 1 gallon per millisecond equals 3.785411784 base units, so dividing one by the other gives the direct imperial gallon per days-to-gallon per millisecond factor of 1.389988e-8.
Simple example
1 imp gal/d × 1.389988e-8 = 1.389988e-8 gal/ms
1 imperial gallon per days = 1.389988e-8 gallons per millisecond.
Real-world example
60 imp gal/d × 1.389988e-8 = 8.33993e-7 gal/ms
60 imperial gallon per days = 8.33993e-7 gallons per millisecond.
Conversion table
| Imperial gallon per Days (imp gal/d) | Gallon per Millisecond (gal/ms) |
|---|---|
| 0.1 imp gal/d | 1.389988e-9 gal/ms |
| 1 imp gal/d | 1.389988e-8 gal/ms |
| 10 imp gal/d | 1.389988e-7 gal/ms |
| 60 imp gal/d | 8.33993e-7 gal/ms |
| 100 imp gal/d | 0.00000139 gal/ms |
| 1,000 imp gal/d | 0.0000138999 gal/ms |
Reverse conversion: Gallon per Millisecond to Imperial gallon per Days
1.389988e-8 gal/ms × 71943049.55 = 0.9999997556 imp gal/d
1.389988e-8 gallons per millisecond = 0.9999997556 imperial gallon per days.
imperial gallon per days = gallons per millisecond × 71943049.5519
For a page dedicated to this direction, see Gallon per Millisecond to Imperial gallon per Days.
Understanding the Imperial gallon per Days (imp gal/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 imperial gallon per days?
1 imperial gallon per days equals 1.389988e-8 gallons per millisecond, using the exact defined conversion factor rather than an estimate.
How do I convert imperial gallon per days to gallon per millisecond?
Multiply the imperial gallon per days value by 1.389988e-8. The converter above does this instantly to whatever precision you set.
How do I convert gallon per millisecond back to imperial gallon per days?
Use the reverse factor: 1 gallon per millisecond equals 71,943,049.55 imperial gallon per days. You can also use the swap control in the converter above to flip the direction instantly.
What is a imperial gallon per days?
Imperial gallon per Days (imp gal/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 imperial gallon per days to gallon per millisecond conversion exact?
Yes. Both imperial gallon per days and gallon per millisecond are defined by fixed standards rather than physical artifacts, so the factor of 1.389988e-8 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.