Understanding Imperial Gallons per Day to Imperial Gallons per Minute Conversion
The Imperial Gallon per Day (imp-gal/d) is a volume flow rate equal to one UK gallon of 4.54609 litres flowing steadily over a 24-hour day, a rate often used for water usage, irrigation and metering in Commonwealth countries. The Imperial Gallon per Minute (imp-gal/min) is an Imperial flow rate of one UK gallon (4.54609 litres) each minute. Converting between them lets you compare a slow daily consumption figure against a faster time base or a different measurement system. Both units use the same Imperial gallon, so this is a pure time rescaling from days to minutes.
Conversion Formula
To convert Imperial Gallons per Day to Imperial Gallons per Minute, multiply the number of Imperial Gallons per Day by this factor:
Step-by-Step Example
Convert 25 Imperial Gallons per Day to Imperial Gallons per Minute.
Write the formula:
Substitute the value:
Calculate the result:
How to Convert Imperial Gallons per Day to Imperial Gallons per Minute
Follow these steps to change a flow rate from Imperial Gallons per Day into Imperial Gallons per Minute.
- Identify the value: Note the flow rate you have in Imperial Gallons per Day (imp-gal/d).
- Apply the factor: Multiply that number by 0.000694444, the number of Imperial Gallons per Minute in one Imperial Gallon per Day.
- Read the result: The product is your flow rate in Imperial Gallons per Minute (imp-gal/min).
- Check with an example: 25 imp-gal/d × 0.000694444 ≈ 0.0173611 imp-gal/min.
Imperial Gallons per Day to Imperial Gallons per Minute conversion table
| Imperial Gallons per Day (imp-gal/d) | Imperial Gallons per Minute (imp-gal/min) |
|---|---|
| 0 | 0 |
| 1 | 0.0006944444 |
| 2 | 0.001388889 |
| 3 | 0.002083333 |
| 4 | 0.002777778 |
| 5 | 0.003472222 |
| 6 | 0.004166667 |
| 7 | 0.004861111 |
| 8 | 0.005555556 |
| 9 | 0.00625 |
| 10 | 0.006944444 |
| 15 | 0.01041667 |
| 20 | 0.01388889 |
| 25 | 0.01736111 |
| 30 | 0.02083333 |
| 40 | 0.02777778 |
| 50 | 0.03472222 |
| 60 | 0.04166667 |
| 70 | 0.04861111 |
| 80 | 0.05555556 |
| 90 | 0.0625 |
| 100 | 0.06944444 |
| 150 | 0.1041667 |
| 200 | 0.1388889 |
| 250 | 0.1736111 |
| 300 | 0.2083333 |
| 400 | 0.2777778 |
| 500 | 0.3472222 |
| 600 | 0.4166667 |
| 700 | 0.4861111 |
| 800 | 0.5555556 |
| 900 | 0.625 |
| 1000 | 0.6944444 |
| 2000 | 1.388889 |
| 3000 | 2.083333 |
| 4000 | 2.777778 |
| 5000 | 3.472222 |
| 10000 | 6.944444 |
| 25000 | 17.36111 |
| 50000 | 34.72222 |
| 100000 | 69.44444 |
| 250000 | 173.6111 |
| 500000 | 347.2222 |
| 1000000 | 694.4444 |
What is the Imperial Gallon per Day?
The Imperial gallon per day (imp gal/d) is a unit of volumetric flow rate that expresses how many Imperial gallons of a fluid pass a point over the span of one day. It is used in the UK and Commonwealth countries for water supply, well yields, plumbing, and utility metering.
Definition
One Imperial gallon per day equals one Imperial gallon of volume divided by the 86,400 seconds in a day. Expressed in SI units of litres per second:
This follows directly from the exact definitions: an Imperial gallon = 4.54609 L exactly, and one day = 86,400 s, so L/s.
Origin and History
The Imperial gallon was fixed by the British Weights and Measures Act of 1824, originally as the volume of 10 pounds of distilled water. It was later redefined in metric terms and, since 1985, has been exactly 4.54609 litres. Expressing flow "per day" arose naturally from water-utility billing and reservoir management, where daily throughput is the practical accounting period.
Law and Notable Facts
The Imperial gallon remains a legally recognised unit in the United Kingdom and several Commonwealth nations, distinct from the smaller US gallon (3.785411784 L exactly). Because of this, an Imperial gallon per day is about 20% larger than a US gallon per day (1 imp gal/d ≈ 1.20095 US gal/d), a difference that matters when reading equipment specified in the other system.
Real-World Examples and Conversions
- A typical UK household uses on the order of 100 Imperial gallons per day (about 455 litres), which is roughly 0.00526 L/s.
- A small trickling borehole yielding 1,000 imp gal/d supplies about 4,546 litres daily, or roughly 0.0526 L/s.
- Converting to metric daily volume: 1 imp gal/d = 4.54609 litres per day.
- 1,000,000 imp gal/d (a common water-treatment plant rating) equals about 52.6 L/s, or roughly 4.546 megalitres per day.
What is the Imperial Gallon per Minute?
The imperial gallon per minute is a unit of volumetric flow rate, measuring how many imperial (UK) gallons of liquid pass a point each minute. It is common in British and Commonwealth plumbing, pumping, and irrigation specifications.
Definition
One imperial gallon per minute equals one imperial gallon (4.54609 litres exactly) of volume flowing every 60 seconds:
Because the imperial gallon is defined as exactly 4.54609 L, the exact relation is L/s. Note that the imperial gallon is about 20% larger than the US liquid gallon (3.785411784 L), so an imperial gpm is a larger flow than a US gpm.
Origin and History
The imperial gallon dates to the British Weights and Measures Act of 1824, which fixed it as the volume of 10 pounds of distilled water. It was redefined in 1976 (effective 1985) as exactly 4.54609 litres. The "per minute" flow rate arose naturally from waterworks and pump ratings, where minutes are a convenient interval for reading meters and sizing equipment.
Law and Notable Facts
The imperial gallon remains a legal unit in the United Kingdom and several Commonwealth nations, though the litre per second and cubic metre per hour are the SI-based standards for engineering. A tap flowing at 1 imp-gal/min delivers about 4.55 litres every minute; UK water-efficiency guidance often rates fittings in litres per minute, where 1 imp-gal/min corresponds to roughly 4.55 L/min.
Real-World Examples and Conversions
- A typical domestic kitchen tap or shower flows around 2 to 3 imp-gal/min (about 9 to 14 L/min).
- 1 imp-gal/min equals 60 imperial gallons per hour, or approximately 4.546 cubic metres per hour when multiplied out over an hour ( litres/hour, i.e. 0.27277 m³/h).
- To convert to US gallons per minute, multiply by 1.20095: 1 imp-gal/min ≈ 1.201 US gpm.
- A small garden pump rated at 10 imp-gal/min moves about 0.758 litres per second, enough to fill a 200-litre water butt in roughly 4.4 minutes.
Frequently Asked Questions
What is the formula to convert Imperial Gallons per Day to Imperial Gallons per Minute?
Multiply the flow rate in imp-gal/d by 0.000694444 to get the value in imp-gal/min. In symbols, imp-gal/min = imp-gal/d × 0.000694444.
How many Imperial Gallons per Minute are in 1 Imperial Gallon per Day?
One Imperial Gallon per Day equals 0.000694444 Imperial Gallons per Minute. Conversely, one Imperial Gallon per Minute equals 1440 Imperial Gallons per Day.
How do I convert 10 Imperial Gallons per Day to Imperial Gallons per Minute?
Multiply 10 by 0.000694444, which gives 0.00694444 imp-gal/min.
Does this use the UK or US gallon?
The source unit is the Imperial (UK) gallon of 4.54609 litres, not the US liquid gallon of 3.785412 litres. Both units use the same Imperial gallon, so this is a pure time rescaling from days to minutes.
Where is the Imperial Gallon per Day used in practice?
It is common in water-supply metering, plumbing, irrigation and appliance flow ratings in the UK and other Commonwealth regions, where daily consumption is the natural reporting period.