This is a chart of run paces for a variety of common triathlon distances.
These are direct conversions not predictions.
Simply find the triathlon race distance at the top. Then scroll down to the average pace (in minutes per mile) you expect to hold. At the intersection you will find the time it will take to cover the distance.
For example, the chart shows that if you were to average 8:00 pace on the run leg of an Ironman race you would finish in a time of 3 hour, 29 minutes, 36 seconds.
Use the graphic below to see how the run portion of different triathlon races compare in length.