Quirkulator

Us Gallons Per Hour to Liters Per Hour Converter

Convert US gallons per hour to liters per hour with the exact factor 3.78541, plus real reference values in both units.

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Result in liters per hour
Adjust the inputs

Your result updates live as you type.

One US gallon per hour is exactly 3.785411784 liters per hour, so converting US gallons per hour to liters per hour is a single multiplication. Enter any figure and the result appears as you type — the arithmetic runs in your browser, so nothing is sent anywhere.

The rating unit for dosing pumps, drip irrigation and small boilers. Used for fuel burn and small pumps.

Standard versus actual volume. Gas flow in CFM depends on pressure and temperature, which is why compressor ratings say SCFM and specify the reference conditions. Converting the number is exact; comparing two ratings measured at different conditions is not. Below the calculator there is a step table for the values people look up most, and a second table putting real volumetric flow figures into liters per hour so the number you get has something to be compared against.

The formula

liters per hour = US gallons per hour × 3.78541178421
US gallons per hour
The amount you are converting, in US gallons per hour
3.78541178421
The exact number of liters per hour in one US gallon per hour
liters per hour
The converted result

How it works, step by step

  1. Enter the value in US gallons per hour.
  2. It is multiplied by 3.78541178421, the exact factor between the two units.
  3. The answer is shown in liters per hour, with the reverse conversion beneath it.
  4. Check the reference table if you want a figure of comparable size.

Worked examples

A bathroom tap: 95.1 GPH in liters per hour

A bathroom tap comes to about 95.1 GPH. Multiplying by the factor: 95.1 × 3.78541 = 359.993 L/h. Dividing the answer back by 3.78541 returns the figure you started with, which is the quickest way to check you have the factor the right way up.

A garden hose: 285 GPH in liters per hour

At 285 GPH (a garden hose), the same quantity in liters per hour is 285 × 3.78541 = 1078.84 L/h. One US gallon per hour is 3.78541 liters per hour, so the numbers grow as expected.

How to read your score

0–0ZeroZero US gallons per hour is zero liters per hour.
0–1Under one unitThe answer is less than one liter per hour.
1–1,000Everyday rangeA typical working figure in liters per hour.
1,000–—Large valueLarge enough that the exact figure below the gauge is easier to read than the gauge itself.

Frequently asked questions

How many liters per hour are in one US gallon per hour?

Exactly 3.78541178421. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.

What is the formula to convert US gallons per hour to liters per hour?

liters per hour = US gallons per hour × 3.78541178421. Reversed, US gallons per hour = liters per hour ÷ 3.78541178421, which is the same as multiplying by 0.264172052344.

Which is the bigger unit, the US gallon per hour or the liter per hour?

The US gallon per hour. One US gallon per hour equals 3.78541 liters per hour.

What does this quantity actually measure?

Both units measure volumetric flow. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.

What is a US gallon per hour?

Used for fuel burn and small pumps.

What is a liter per hour?

The rating unit for dosing pumps, drip irrigation and small boilers.

Why does my answer differ from another converter?

Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.

Is there a quick way to do GPH to L/h in my head?

Plenty of people do this in their head: multiply by 3.8 instead of using the exact factor 3.785411784. At 100 that shortcut gives 380 liters per hour, off by 1.459 liters per hour or about 0.39%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.

Us Gallons Per Hour to liters per hour reference tables

Us Gallons Per Hour to liters per hour conversion table
Us Gallons Per HourLiters Per Hour
0.5 GPH1.89271 L/h
1 GPH3.78541 L/h
2 GPH7.57082 L/h
3 GPH11.3562 L/h
5 GPH18.9271 L/h
10 GPH37.8541 L/h
20 GPH75.7082 L/h
25 GPH94.6353 L/h
50 GPH189.271 L/h
75 GPH283.906 L/h
100 GPH378.541 L/h
250 GPH946.353 L/h
500 GPH1892.71 L/h
1000 GPH3785.41 L/h
5000 GPH18,927.1 L/h

Exact factor: 1 US gallon per hour = 3.78541178421 liters per hour.

Real volumetric flow figures in US gallons per hour and liters per hour
QuantityGPHL/h
A dripping tap0.0951 GPH0.36 L/h
A bathroom tap95.1 GPH360 L/h
A shower head152.2 GPH576 L/h
A garden hose285.3 GPH1080 L/h
A fire hydrant5.706e+04 GPH2.16e+05 L/h
The Thames at London6.182e+07 GPH2.34e+08 L/h

Published reference values, converted with the same factor this page uses.

Related calculators

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Flow Rate Unit Pairs

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