Cubic feet per minute (ft³/min) to Litres per hour (l/h) conversion

Understanding Cubic feet per minute to Litres per hour Conversion

Cubic feet per minute ($ft^3/min$) and litres per hour ($l/h$) are both units of volumetric flow rate, meaning they describe how much volume moves through a system over time. Cubic feet per minute is commonly used in HVAC, ventilation, and industrial airflow contexts, while litres per hour is often used in pumps, dosing systems, laboratory equipment, and fluid handling. Converting between them helps compare specifications across industries and between imperial and metric measurement systems.

Conversion Formula

The verified relationship between these units is:

$$1\ ft^3/min = 1699.0099199289\ l/h$$

To convert from cubic feet per minute to litres per hour, use:

$$l/h = ft^3/min \times 1699.0099199289$$

The reverse conversion is:

$$ft^3/min = l/h \times 0.0005885780820172$$

Since this page focuses on converting $ft^3/min$ to $l/h$, the main formula is:

$$l/h = ft^3/min \times 1699.0099199289$$

Step-by-Step Example

Suppose a ventilation or fluid transfer system has a flow rate of $8.25\ ft^3/min$.

Write the formula:

$$l/h = ft^3/min \times 1699.0099199289$$

Substitute the given value:

$$l/h = 8.25 \times 1699.0099199289$$

Calculate:

$$l/h = 14016.8318394134$$

So:

$$8.25\ ft^3/min = 14016.8318394134\ l/h$$

Real-World Examples

• A compact workshop dust extraction line moving $3.5\ ft^3/min$ corresponds to $5946.53471975115\ l/h$.
• A laboratory circulation system rated at $0.75\ ft^3/min$ converts to $1274.257439946675\ l/h$.
• A small industrial blower delivering $12\ ft^3/min$ equals $20388.1190391468\ l/h$.
• A process transfer line operating at $25\ ft^3/min$ corresponds to $42475.2479982225\ l/h$.

Interesting Facts

• Cubic feet per minute, often written as CFM, is a widely used unit for airflow in heating, ventilation, and air conditioning applications. It is especially common in equipment specifications for fans, blowers, and air handling systems. Source: Wikipedia: Cubic feet per minute
• The litre is a metric unit of volume equal to one cubic decimetre, and it is accepted for use with the International System of Units even though it is not an SI base unit. This makes litres per hour a practical metric flow unit for many engineering and scientific applications. Source: NIST SI Units – units outside the SI

How to Convert Cubic feet per minute to Litres per hour

To convert Cubic feet per minute to Litres per hour, multiply the flow rate by the conversion factor between these two units. For this example, use the verified factor $1\ \text{ft}^3/\text{min} = 1699.0099199289\ \text{l/h}$.

1. Write down the given value:
   Start with the flow rate you want to convert:

   $$25\ \text{ft}^3/\text{min}$$

2. Use the conversion factor:
   Apply the verified conversion factor:

   $$1\ \text{ft}^3/\text{min} = 1699.0099199289\ \text{l/h}$$

3. Set up the multiplication:
   Multiply the given value by the factor so the unit changes from Cubic feet per minute to Litres per hour:

   $$25\ \text{ft}^3/\text{min} \times 1699.0099199289\ \text{l/h per ft}^3/\text{min}$$

4. Calculate the result:

   $$25 \times 1699.0099199289 = 42475.247998222$$

5. Result:

   $$25\ \text{ft}^3/\text{min} = 42475.247998222\ \text{l/h}$$

A quick way to check your work is to make sure the result is much larger, since converting from per minute to per hour increases the value. Keep the full conversion factor to maintain accuracy in your final answer.

What is the formula to convert Cubic feet per minute to Litres per hour?

To convert Cubic feet per minute to Litres per hour, multiply the flow rate by the verified factor $1699.0099199289$. The formula is: $l/h = ft^3/min \times 1699.0099199289$. This gives the equivalent volume flow in litres per hour.

How many Litres per hour are in 1 Cubic foot per minute?

There are exactly $1699.0099199289 \, l/h$ in $1 \, ft^3/min$ based on the verified conversion factor. This is the standard value used on this converter page. It helps you quickly compare imperial and metric flow rates.

Why would I convert Cubic feet per minute to Litres per hour?

This conversion is useful when working with airflow, gas flow, water systems, pumps, and ventilation equipment that use different unit systems. Many technical documents in the U.S. use $ft^3/min$, while international specifications often use $l/h$. Converting ensures values are understood consistently across regions and industries.

Can I use this conversion for real-world equipment ratings?

Yes, this conversion is commonly used for fans, compressors, air filters, HVAC systems, and fluid transfer equipment. If a device is rated in $ft^3/min$ but your project documentation requires $l/h$, multiply by $1699.0099199289$. Always check whether the manufacturer refers to actual flow, standard flow, or test-condition flow.

How do I convert a value from ft3/min to l/h manually?

Take the number of Cubic feet per minute and multiply it by $1699.0099199289$. For example, if a flow rate is $2 \, ft^3/min$, then the result is $2 \times 1699.0099199289 \, l/h$. This method works for any value entered into the converter.

Is the conversion factor always the same?

Yes, the factor $1 \, ft^3/min = 1699.0099199289 \, l/h$ is constant for unit conversion. It does not change with the material being measured because it is based only on volume and time units. However, measured flow in practice can still vary due to pressure, temperature, and operating conditions.