Negative Split Planner

Plan your first and second half targets. Running a controlled first half typically leads to a stronger finish.

GOAL MARATHON TIME

UNIT

SPLIT STRATEGY

50/50 (even split)51/49 (first half about 4% slower)52/48 (first half about 8% slower)53/47 (first half about 13% slower)

Enter a time to see the result.

Each option splits your goal time between the two halves: 51/49 means the first half takes 51% of the time and the second 49%. Many coaches advise an even or slightly negative split for the marathon: holding back early leaves more for the last miles.