Negative Split Calculator — Run the Second Half Faster
Plan a negative split strategy where you run the second half of your race faster than the first.
How many seconds per km faster for the second half
How We Calculate This
Negative Split Strategy
The calculator divides your goal time into two halves with a pace difference:
First half pace = Average pace + (difference / 2)
Second half pace = Average pace - (difference / 2)
This ensures both halves add up to your goal finish time while creating the desired negative split.
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates. Always consult a coach or medical professional for personalised training advice.