# Convert Double Square Foot to Double Square Millimeter (ft4 to mm4)

In next fields, kindly type your value in the text box under title [ From: ] to convert from double square foot to double square millimeter (ft4 to mm4). As you type your value, the answer will be automatically calculated and displayed in the text box under title [ To: ].

**Definitions:**

**Double Square Foot** (abbreviation: **ft4**): is an imperial unit and U.S. customary unit (non-SI, non-metric) of area moment of inertia, a geometrical property of an area which reflects how its points are distributed with regard to an arbitrary axis.

**Double Square Millimeter** (abbreviations: **mm4, or mm 4**): is the SI derived unit of area moment of inertia, a geometrical property of an area which reflects how its points are distributed with regard to an arbitrary axis.

## How to Convert Double Square Feet to Double Square Millimeters

*Example: How many double square millimeters are equivalent to 9.11 double square feet?*

As;

1 double square feet = 8630974841.2416 double square millimeters

9.11 double square feet = Y double square millimeters

Assuming Y is the answer, and by criss-cross principle;

Y equals 9.11 times 8630974841.2416 over 1

(i.e.) Y = 9.11 * 8630974841.2416 / 1 = 78628180803.711 double square millimeters

Answer is: 78628180803.711 double square millimeters are equivalent to 9.11 double square feet.

*Practice Question: Convert the following units into mm4:*

N.B.: After working out the answer to each of the next questions, click adjacent button to see the correct answer.

( i ) 58.98 ft4

( ii ) 73.69 ft4

( iii ) 58.41 ft4