Understanding Imperial Gallons per Hour to Imperial Gallons per Minute Conversion
An Imperial gallon per hour (imp-gal/h) is a UK/imperial volume-flow-rate unit: one Imperial gallon, equal to 4.54609 litres, passing a point each hour. An Imperial gallon per minute is the same Imperial gallon of volume passing each minute; since an hour holds 60 minutes, the per-minute rate is one-sixtieth of the per-hour rate. This conversion is commonly used for pump and hose ratings, plumbing flow checks, and any short-interval flow measurement where per-hour figures feel too coarse. The factor is exactly 1/60, so 1 imp-gal/h equals 0.0166667 imp-gal/min.
Conversion Formula
To convert Imperial Gallons per Hour to Imperial Gallons per Minute, multiply the number of Imperial Gallons per Hour by this factor:
Step-by-Step Example
Convert 25 Imperial Gallons per Hour to Imperial Gallons per Minute.
Write the formula:
Substitute the value:
Calculate the result:
How to Convert Imperial Gallons per Hour to Imperial Gallons per Minute
Follow these steps to turn a flow in Imperial Gallons per Hour into Imperial Gallons per Minute.
- Note the flow rate: Start with your value in Imperial Gallons per Hour (imp-gal/h).
- Apply the factor: Multiply that value by 0.0166667, since 1 imp-gal/h = 0.0166667 imp-gal/min.
- Read the result: The product is the equivalent flow in Imperial Gallons per Minute (imp-gal/min).
For example, 25 imp-gal/h × 0.0166667 ≈ 0.416667 imp-gal/min.
Imperial Gallons per Hour to Imperial Gallons per Minute conversion table
| Imperial Gallons per Hour (imp-gal/h) | Imperial Gallons per Minute (imp-gal/min) |
|---|---|
| 0 | 0 |
| 1 | 0.01666667 |
| 2 | 0.03333333 |
| 3 | 0.05 |
| 4 | 0.06666667 |
| 5 | 0.08333333 |
| 6 | 0.1 |
| 7 | 0.1166667 |
| 8 | 0.1333333 |
| 9 | 0.15 |
| 10 | 0.1666667 |
| 15 | 0.25 |
| 20 | 0.3333333 |
| 25 | 0.4166667 |
| 30 | 0.5 |
| 40 | 0.6666667 |
| 50 | 0.8333333 |
| 60 | 1 |
| 70 | 1.166667 |
| 80 | 1.333333 |
| 90 | 1.5 |
| 100 | 1.666667 |
| 150 | 2.5 |
| 200 | 3.333333 |
| 250 | 4.166667 |
| 300 | 5 |
| 400 | 6.666667 |
| 500 | 8.333333 |
| 600 | 10 |
| 700 | 11.66667 |
| 800 | 13.33333 |
| 900 | 15 |
| 1000 | 16.66667 |
| 2000 | 33.33333 |
| 3000 | 50 |
| 4000 | 66.66667 |
| 5000 | 83.33333 |
| 10000 | 166.6667 |
| 25000 | 416.6667 |
| 50000 | 833.3333 |
| 100000 | 1666.667 |
| 250000 | 4166.667 |
| 500000 | 8333.333 |
| 1000000 | 16666.67 |
What is the Imperial Gallon per Hour?
The imperial gallon per hour (imp-gal/h) is a unit of volumetric flow rate expressing how many imperial gallons of fluid pass a point in one hour. It is used in the UK and other Commonwealth countries for pumps, fuel consumption, and plumbing flow ratings.
Definition
One imperial gallon per hour equals one imperial gallon of volume divided by one hour (3,600 seconds):
The imperial gallon is defined as exactly 4.54609 litres, so dividing by 3,600 seconds gives 4.54609 / 3600 = 0.00126280 L/s (equivalently 4.54609 L/h).
Origin and History
The imperial gallon was established by the British Weights and Measures Act of 1824, originally defined as the volume of 10 pounds of water at a specified temperature. It was later fixed by reference to the litre. The "per hour" rate arose naturally in the 19th and 20th centuries as a practical measure for pump throughput and fuel usage, hours being a convenient interval for slow, steady flows.
Law and Notable Facts
The imperial gallon (4.54609 L exactly) is legally distinct from and about 20% larger than the US liquid gallon of 3.785411784 L. As a result an imperial gallon per hour is likewise about 20% greater than a US gallon per hour. Since UK metrication, the imperial gallon is no longer a primary trade unit but persists in fuel-economy figures (miles per gallon) and equipment specifications.
Real-World Examples and Conversions
- A small garden or aquarium pump rated at 100 imp-gal/h moves about 454.6 litres of water every hour, roughly 0.126 L/s.
- A domestic tap running at 1 imperial gallon per hour is a bare trickle of about 4.55 L each hour.
- 1 imp-gal/h ≈ 0.833 US gal/h, reflecting the larger imperial gallon.
- A pump moving 220 imp-gal/h delivers about 1,000 L/h, or roughly 0.278 L/s.
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 Hour to Imperial Gallons per Minute?
Multiply the flow in Imperial Gallons per Hour by 0.0166667. In symbols, imp-gal/min = imp-gal/h × 0.0166667.
How many Imperial Gallons per Minute are in 1 Imperial Gallon per Hour?
One Imperial Gallon per Hour equals 0.0166667 Imperial Gallons per Minute. Working the other way, one Imperial Gallon per Minute equals 60 Imperial Gallons per Hour.
How do I convert 10 Imperial Gallons per Hour to Imperial Gallons per Minute?
Multiply 10 by 0.0166667, which gives 0.166667 Imperial Gallons per Minute.
Is this based on the Imperial or US gallon?
It uses the Imperial (UK) gallon of 4.54609 litres, which is about 20% larger than the US liquid gallon of 3.78541 litres. The factor is exactly 1/60, so 1 imp-gal/h equals 0.0166667 imp-gal/min.
Where is the Imperial Gallon per Hour to Imperial Gallon per Minute conversion useful?
It is handy for pump and hose ratings, plumbing flow checks, and any short-interval flow measurement where per-hour figures feel too coarse.