The probability of getting a head on a single coin toss is 0.5 (or 50%).
Since each coin toss is independent of the others, the probability of getting a head on all three tosses is calculated by multiplying the individual probabilities together:
0.5 * 0.5 * 0.5 = 0.125
Therefore, the probability of getting a head on all three coin tosses is 0.125 or 12.5%.