You’ve got a big event coming up—a half-marathon or maybe even a full. Even if your only goal is to finish, you may still want to know how long you’ll be out there.
If you’ve run a 5K this year, you can plug your time into an online “race time predictor” (like the one at runnersworld.com/predictor). These tools convert your 5K pace to the (slower) pace you should be able to keep for longer distances. Doing a 5K close to race day will give you the best picture of your current fitness.