This study examined people's ability to predict and judge their own typing performance. 20 students completed 200 trials of typing words and 200 trials of typing letter strings. They were asked to first predict if they would type faster or slower than normal, then type the item and judge their actual performance. The results showed people are better at judging their own past performance than predicting future performance. Judging a completed task provides more certainty than predicting an unknown future outcome. The study suggests people have a greater ability to accurately judge their own performance after a task than to predict how they will perform before completing it.