CFM to Cubic Inch per Hour (in³/h) Calculator

With our tool, you can easily convert between Cubic Feet per Minute (CFM) and Cubic Inches per Hour (in³/h). It’s perfect for engineers, designers, and professionals who need to measure and compare airflow in different units.

You can convert CFM to in3/h using its fixed conversion factor 1 CFM =103,680 in3/h. I think following guide is enough for you to learn the manual conversion.

How CFM Converts to Cubic Inches per Hour (in³/h)

1. Formula To Convert CFM to in³/h

$$\text{in³/h} = CFM \times 103,680$$

2. Formula To Convert In3/h To CFM

$$CFM = \frac{\text{in³/h}}{103,680}$$

Example

For example, you have a box that’s 1 cubic foot in size, and it’s filled with air. Now, think of that cubic foot of air moving through a duct every minute. This is what we call 1 CFM (Cubic Foot per Minute). But to understand how it connects to cubic inches per hour, let’s take it step by step.

Step 1: Understand the Size Difference

• 1 cubic foot is a cube that measures 12 inches × 12 inches × 12 inches.

• That means the total volume inside the cube is:

  $$12 \times 12 \times 12 = 1,728 \text{ cubic inches}$$

  So, 1 cubic foot = 1,728 cubic inches.

Step 2: Accounting for Time

Since CFM measures how much air moves per minute, we need to figure out how much air moves in one hour.

There are 60 minutes in an hour. So, if 1 CFM moves 1,728 cubic inches of air every minute, in one hour, it would move:

$$1,728 \times 60 = 103,680 \text{ cubic inches per hour}$$

Thus, every 1 CFM is equivalent to moving 103,680 cubic inches of air in one hour.

Step 3: Put It All Together

Now, let’s say a fan moves 10 CFM of air.

We will use the conversion factor, we multiply:

$$10 \times 103,680 = 1,036,800 \text{ in³/h}$$

So, a 10 CFM fan moves over a million cubic inches of air per hour!

Point To Remember

💡 Always multiply by 103,680 when converting from CFM to in³/h.
💡 To reverse the conversion, divide by 103,680.

CFM to in³/ Quick Conversion Chart