Race Prediction Calculator

Use this race prediction calculator to set realistic running goals. As with any prediction tool, it is not an exact science but it should give you a good idea for the approximate time to aim for.

There are many race prediction formulas out there, but please do not limit or over-extend your capabilities based on this. You'll often see a predict-your-time 5k race prior to many marathons, as this has proven to be a reliable indicator for many distance runners.

If you haven't run any of the three race distances listed under 'Base Distances', go to the track and do a self time-trial. Remember that one lap around the track is 400 meters.I find that tools like this come in handy when attempting to set race pace goals. For example, I’ve often had my sights on breaking a 3-hour marathon and know that I’ve lacked the speed to do this. By playing with the calculator a bit, I’ve deduced that I’ll need to break 38 minutes in a 10k (or break 18 minutes in a 5k) to be at the desired fitness level to break 3 hours in a marathon. Bottom line: The calculator helps me set realistic race goals.

Goals that are too easy or too hard can deflate our ego and detract from our momentum. So now that you have a realistic target, set your goal and pursue it to the best of your ability.

Using the Race Prediction Calculator:

1. Enter a Base Distance (1.5k, 5k, or 10k) that you’ve recently run.
2. Enter your time in the 3 fields (hours, minutes, and seconds. Note: You’ll need to enter something in each field, so enter a zero if applicable.
3. Hit the Calculate button to see predicted times for other distances.
4. Perform follow-on iterations to “bridge” gaps from short-distance to long-distance races. For example, to see what 5k time I’d need for a sub-3 marathon I see what 10k time equates to sub-3 and look up the 5k time associated with it.