Gallons per hour (gal/h) to Litres per day (l/d) conversion

Understanding Gallons per hour to Litres per day Conversion

Gallons per hour ($\text{gal/h}$) and litres per day ($\text{l/d}$) are both units of volume flow rate, used to describe how much liquid moves or is delivered over time. Converting between them is useful when comparing equipment specifications, pump outputs, fuel or water usage, and industrial flow data that may be listed in different unit systems.

Gallons per hour is commonly seen in U.S. customary measurements, while litres per day fits within the metric system and is often more convenient for daily total volume estimates. Moving from an hourly unit to a daily unit helps express the same flow over a longer period of time.

Conversion Formula

The verified relationship between these units is:

$$1\ \text{gal/h} = 90.849882820952\ \text{l/d}$$

So, to convert gallons per hour to litres per day:

$$\text{l/d} = \text{gal/h} \times 90.849882820952$$

The reverse conversion is:

$$1\ \text{l/d} = 0.01100716884766\ \text{gal/h}$$

So, to convert litres per day to gallons per hour:

$$\text{gal/h} = \text{l/d} \times 0.01100716884766$$

Step-by-Step Example

Suppose a water dosing pump delivers $18.5\ \text{gal/h}$.

Write the formula:

$$\text{l/d} = \text{gal/h} \times 90.849882820952$$

Substitute the value:

$$\text{l/d} = 18.5 \times 90.849882820952$$

Calculate:

$$18.5\ \text{gal/h} = 1680.722832187612\ \text{l/d}$$

So a flow rate of $18.5\ \text{gal/h}$ is equal to $1680.722832187612\ \text{l/d}$.

Real-World Examples

• A chemical metering pump rated at $2.75\ \text{gal/h}$ is equivalent to $249.837177757618\ \text{l/d}$.
• A fuel transfer system operating at $12\ \text{gal/h}$ corresponds to $1090.198593851424\ \text{l/d}$.
• A livestock watering line flowing at $0.8\ \text{gal/h}$ equals $72.6799062567616\ \text{l/d}$.
• A small irrigation pump delivering $25\ \text{gal/h}$ produces $2271.2470705238\ \text{l/d}$.

Interesting Facts

• The litre is a metric unit of volume equal to one cubic decimetre, and it is widely used internationally for liquids in science, commerce, and daily life. Source: Britannica - litre
• Gallon-based flow units can vary by system because the U.S. gallon and the imperial gallon are not the same size. That is why precise conversion factors matter when converting gallon-based rates into metric units. Source: Wikipedia - Gallon

Summary

Gallons per hour and litres per day describe the same kind of quantity: volume flow over time. The key verified factor for this conversion is:

$$1\ \text{gal/h} = 90.849882820952\ \text{l/d}$$

For direct conversion, multiply the value in gallons per hour by $90.849882820952$:

$$\text{l/d} = \text{gal/h} \times 90.849882820952$$

For reverse conversion, use:

$$\text{gal/h} = \text{l/d} \times 0.01100716884766$$

This conversion is especially useful in water treatment, pumping systems, agricultural flow measurement, chemical dosing, and fuel handling where one source may report hourly gallon rates and another may require daily litre totals.

How to Convert Gallons per hour to Litres per day

To convert Gallons per hour (gal/h) to Litres per day (l/d), multiply the flow rate by the conversion factor between these two units. For this example, use the verified factor $1\ \text{gal/h} = 90.849882820952\ \text{l/d}$.

1. Write the conversion formula:
   Use the general formula:

   $$\text{Litres per day} = \text{Gallons per hour} \times 90.849882820952$$

2. Substitute the given value:
   Insert $25\ \text{gal/h}$ into the formula:

   $$\text{l/d} = 25 \times 90.849882820952$$

3. Multiply:
   Perform the calculation:

   $$25 \times 90.849882820952 = 2271.2470705238$$

4. Result:

   $$25\ \text{Gallons per hour} = 2271.2470705238\ \text{Litres per day}$$

A quick way to check your work is to confirm that the result is much larger than the hourly value, since you are converting from per hour to per day. Keeping the conversion factor handy makes repeated flow-rate conversions faster.

What is the formula to convert Gallons per hour to Litres per day?

To convert Gallons per hour to Litres per day, multiply the flow rate in gal/h by the verified factor $90.849882820952$.
The formula is: $l/d = gal/h \times 90.849882820952$.

How many Litres per day are in 1 Gallon per hour?

There are exactly $90.849882820952$ Litres per day in $1$ Gallon per hour.
This means a continuous flow of $1$ gal/h over a full day equals $90.849882820952$ l/d.

Why do I need to convert Gallons per hour to Litres per day?

This conversion is useful when comparing flow rates across systems that use different units.
It is common in water treatment, irrigation, chemical dosing, and industrial fluid monitoring where daily volume in litres is easier to interpret.

Can I use this conversion for pump and water system calculations?

Yes, this conversion is often used to estimate how much water a pump, filter, or dosing system delivers over 24 hours.
For example, if a device is rated in gal/h but your system records daily usage in litres, converting to l/d helps match specifications and planning data.

Is the conversion factor always the same?

Yes, the factor $90.849882820952$ is constant for converting gal/h to l/d on this page.
As long as you are using the same gallon definition assumed by the converter, the formula does not change.

How do I convert a larger Gallons per hour value to Litres per day?

Multiply the given gal/h value by $90.849882820952$ to get the daily volume in litres.
For example, $5$ gal/h becomes $5 \times 90.849882820952$ l/d using the verified factor.