Sprint Splits Calculator
Generate realistic, even, or negative split times for sprint events. Analyze speed profiles, phase breakdowns, and pacing strategies for 100m, 200m, and 400m races.
Sprint Event
Pacing Strategy
How to Use
Select the event
Choose from 100m, 200m, or 400m to see splits tailored to that event's characteristics.
Choose a pacing strategy
Select Realistic (typical fade), Even (consistent pace), or Negative (build to finish) splits.
Enter your target time
Input your goal finish time in seconds to generate projected splits and velocity data.
How It Works
v(t) = v_max × f(distance, phase)
100m Phase Model:
0-30m: Acceleration (70-100% of max velocity)
30-60m: Near max velocity (98%)
60-80m: Maximum velocity (100%)
80-100m: Deceleration (92-96%)
Splits are modeled based on biomechanical research and elite race analysis. Actual splits vary based on individual characteristics, conditions, and race execution.
Frequently Asked Questions
What are the phases of a 100m race?
The 100m has four phases: Drive Phase (0-30m) - powerful acceleration from blocks; Transition (30-50m) - shifting from drive to upright; Maximum Velocity (50-80m) - peak speed, minimal ground contact; Deceleration (80-100m) - speed maintenance as fatigue sets in.
How do elite sprinters distribute their speed in the 100m?
Elite sprinters typically reach maximum velocity around 50-60m and maintain it until approximately 80m. Even Usain Bolt decelerated in the final 20m—he was just decelerating less than others. The key is minimizing the slowdown.
What's the optimal pacing strategy for the 400m?
The 400m is typically run with a 'negative speed differential'—the second 200m is slower than the first. Elite athletes aim for minimal differential (1-3 seconds). Starting too fast leads to significant slowdown; even pacing usually produces better results.
Why is the 200m run on a curve?
The 200m starts on a curve, which requires leaning and affects mechanics. The first 100m is generally slower due to the curve. Athletes should run the curve relaxed, then accelerate off the turn onto the straightaway.
How can I use splits to improve my racing?
Compare your splits to target splits to identify weaknesses. If you fade significantly in the final 100m of a 400m, you may be starting too fast or need more speed endurance training. Consistent split improvements indicate better race execution.