To calculate the circumference of a circle, you can use the formula:
\[
C = \pi \times d
\]
where \(C\) is the circumference and \(d\) is the diameter.
Given that the diameter \(d\) is 12 inches and using \( \pi \approx 3.14 \):
\[
C \approx 3.14 \times 12
\]
Now, perform the multiplication:
\[
C \approx 3.14 \times 12 = 37.68
\]
Therefore, the approximate circumference of the circle is **37.68 inches**.