The Reality Slowdown UltraStu Marathon Formula.

Please use the arrow icons to enter your target time

Gender: Male Female
Target Time:
Distance: Slow Down%:
First HM Time: First HM Pace:
Second HM Time: Second HM Pace:

Pacing Table

Lookup Table

5 Mile Splits Summary

5 Mile Splits Pace Time
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About this Page

The RSUSMF formula was developed by Stuart Mills.

S Mills

There are a couple of web site article links below that explain how Stuart developed the formula.

The negative split realisation
The negative split fallacy


The formula was implemented in Javascript by Tim