Negative Split Planner

Plan a negative split race strategy. Run the second half faster than the first for a strong finish.

::
1%3%8%
First Half
1:51:00
Slower half
Second Half
1:39:00
3% faster
#DistanceSplitCumulativePace
11 km5:035:035:03/km
22 km5:0310:065:03/km
33 km5:0315:095:03/km
44 km5:0320:135:03/km
55 km5:0325:165:03/km
66 km5:0330:195:03/km
77 km5:0335:225:03/km
88 km5:0340:255:03/km
99 km5:0345:285:03/km
1010 km5:0350:325:03/km
1111 km5:0355:355:03/km
1212 km5:031:00:385:03/km
1313 km5:031:05:415:03/km
1414 km5:031:10:445:03/km
1515 km5:031:15:475:03/km
1616 km5:031:20:515:03/km
1717 km5:031:25:545:03/km
1818 km5:031:30:575:03/km
1919 km5:031:36:005:03/km
2020 km5:031:41:035:03/km
2121 km5:031:46:065:03/km
2222 km4:541:51:004:54/km
2323 km4:541:55:554:54/km
2424 km4:542:00:494:54/km
2525 km4:542:05:434:54/km
2626 km4:542:10:374:54/km
2727 km4:542:15:314:54/km
2828 km4:542:20:254:54/km
2929 km4:542:25:194:54/km
3030 km4:542:30:134:54/km
3131 km4:542:35:074:54/km
3232 km4:542:40:014:54/km
3333 km4:542:44:554:54/km
3434 km4:542:49:494:54/km
3535 km4:542:54:434:54/km
3636 km4:542:59:374:54/km
3737 km4:543:04:314:54/km
3838 km4:543:09:264:54/km
3939 km4:543:14:204:54/km
4040 km4:543:19:144:54/km
4141 km4:543:24:084:54/km
4242 km4:543:29:024:54/km
430.20 km0:573:29:594:54/km

Why Run Negative Splits?

A negative split means running the second half of a race faster than the first. This is considered the optimal race strategy because it prevents early fatigue from going out too fast and allows you to finish strong when others are fading.

A 2-3% negative split is typical for elite marathoners. The world record marathon has often been run with near-even or slightly negative splits. For most runners, aiming for 2-5% faster in the second half is a good target.

Related Calculators

Want a personalised training plan?

Get an AI-powered training plan built around your fitness level, goals, and schedule. Plus race-day pacing strategy and more.

Get RunSplit Pro — £4.99/mo