To divide 4 by one-half, you can think of it as multiplying 4 by the reciprocal of one-half. The reciprocal of one-half is 2.
So, the calculation is:
\[ 4 \div \frac{1}{2} = 4 \times 2 = 8 \]
Thus, the result of 4 divided by one-half is 8.
The answer is: 8.