It's fun to think about what your latest personal best means you might be able to manage for other distances. This is where race prediction tools can help out.
» General Race Predictors. Shows the predictions from, and compares, the Riegel, Cameron, Vo2 and Age Grading Models.
» Kosmin Test. Predicts what you might run for 800m and 1500m based on the results of a timed test.