Marathon 5K Split Calculator

The results for the New York City Marathon, Boston Marathon, and many other major marathons include the time that you passed the 5K mats along the course, but they don't tell you the time it took to cover only that 5K of the course (the time between each mat and the last). So, it's tough to tell if you were speeding up, slowing down, etc. This calculator fixes that. Just enter the times they gave you for each of the fields below in the format HH:MM:SS.