Understanding Imperial Gallons per Day to Imperial Gallons per Second 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 Second (imp-gal/s) is an Imperial flow rate of one UK gallon (4.54609 litres) each second. Converting between them lets you compare a slow daily consumption figure against a faster time base or a different measurement system. Both units share the Imperial gallon, so the conversion simply rescales the time base from one day to one second.
Conversion Formula
To convert Imperial Gallons per Day to Imperial Gallons per Second, 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 Second.
Write the formula:
Substitute the value:
Calculate the result:
How to Convert Imperial Gallons per Day to Imperial Gallons per Second
Follow these steps to change a flow rate from Imperial Gallons per Day into Imperial Gallons per Second.
- Identify the value: Note the flow rate you have in Imperial Gallons per Day (imp-gal/d).
- Apply the factor: Multiply that number by 0.0000115741, the number of Imperial Gallons per Second in one Imperial Gallon per Day.
- Read the result: The product is your flow rate in Imperial Gallons per Second (imp-gal/s).
- Check with an example: 25 imp-gal/d × 0.0000115741 ≈ 0.000289352 imp-gal/s.
Imperial Gallons per Day to Imperial Gallons per Second conversion table
| Imperial Gallons per Day (imp-gal/d) | Imperial Gallons per Second (imp-gal/s) |
|---|---|
| 0 | 0 |
| 1 | 0.00001157407 |
| 2 | 0.00002314815 |
| 3 | 0.00003472222 |
| 4 | 0.0000462963 |
| 5 | 0.00005787037 |
| 6 | 0.00006944444 |
| 7 | 0.00008101852 |
| 8 | 0.00009259259 |
| 9 | 0.0001041667 |
| 10 | 0.0001157407 |
| 15 | 0.0001736111 |
| 20 | 0.0002314815 |
| 25 | 0.0002893519 |
| 30 | 0.0003472222 |
| 40 | 0.000462963 |
| 50 | 0.0005787037 |
| 60 | 0.0006944444 |
| 70 | 0.0008101852 |
| 80 | 0.0009259259 |
| 90 | 0.001041667 |
| 100 | 0.001157407 |
| 150 | 0.001736111 |
| 200 | 0.002314815 |
| 250 | 0.002893519 |
| 300 | 0.003472222 |
| 400 | 0.00462963 |
| 500 | 0.005787037 |
| 600 | 0.006944444 |
| 700 | 0.008101852 |
| 800 | 0.009259259 |
| 900 | 0.01041667 |
| 1000 | 0.01157407 |
| 2000 | 0.02314815 |
| 3000 | 0.03472222 |
| 4000 | 0.0462963 |
| 5000 | 0.05787037 |
| 10000 | 0.1157407 |
| 25000 | 0.2893519 |
| 50000 | 0.5787037 |
| 100000 | 1.157407 |
| 250000 | 2.893519 |
| 500000 | 5.787037 |
| 1000000 | 11.57407 |
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 Second?
The Imperial gallon per second (imp-gal/s) is a unit of volumetric flow rate, expressing the volume of liquid passing a point each second measured in Imperial (UK) gallons. It appears in British and Commonwealth engineering contexts such as pump ratings, water supply, and fuel handling.
Definition
One Imperial gallon per second equals one Imperial gallon of volume flowing every second. Since the Imperial gallon is defined as exactly 4.54609 litres, the flow rate converts directly to litres per second:
The Imperial gallon is fixed by definition as 4.54609 L exactly (originally the volume of 10 pounds of water). This makes it noticeably larger than the US liquid gallon of 3.785411784 L, so an Imperial gallon per second delivers about 20% more volume than a US gallon per second.
Origin and History
The Imperial gallon was established by the British Weights and Measures Act of 1824, defined as the volume of ten pounds of distilled water at 62 °F. In 1985 the UK redefined it in metric terms as exactly 4.54609 litres. As a rate unit, gallons per second and the more common gallons per minute grew out of the need to specify pump and pipe throughput during the industrial era.
Law and Notable Facts
The Imperial gallon remains a legally recognised unit in the United Kingdom, though the litre is the primary trading unit under metrication. It is distinct from the US gallon: the Imperial gallon (4.54609 L) is roughly 20% larger than the US liquid gallon (3.785 L), so flow figures quoted in "gallons" must always specify which system. A flow of 1 imp-gal/s corresponds to 60 Imperial gallons per minute or 3,600 per hour.
Real-World Examples and Conversions
- A flow of 1 imp-gal/s equals 4.54609 L/s, or about 272.77 litres per minute.
- A typical domestic garden hose delivers well under 1 imp-gal/s; a rate of 1 imp-gal/s (≈16,366 L/h) is closer to a small industrial or firefighting pump.
- 1 imp-gal/s ≈ 1.20095 US gallons per second, reflecting the larger Imperial gallon.
- 1 imp-gal/s ≈ 0.00454609 cubic metres per second, useful when comparing against SI pump specifications.
Frequently Asked Questions
What is the formula to convert Imperial Gallons per Day to Imperial Gallons per Second?
Multiply the flow rate in imp-gal/d by 0.0000115741 to get the value in imp-gal/s. In symbols, imp-gal/s = imp-gal/d × 0.0000115741.
How many Imperial Gallons per Second are in 1 Imperial Gallon per Day?
One Imperial Gallon per Day equals 0.0000115741 Imperial Gallons per Second. Conversely, one Imperial Gallon per Second equals 86400 Imperial Gallons per Day.
How do I convert 10 Imperial Gallons per Day to Imperial Gallons per Second?
Multiply 10 by 0.0000115741, which gives 0.000115741 imp-gal/s.
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 share the Imperial gallon, so the conversion simply rescales the time base from one day to one second.
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.