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A sprint relay planning tool for the 4×100 that estimates where the outgoing runner’s go mark should be placed and where the baton exchange should ideally occur inside the exchange zone. It uses the standard 30 m available distance, a 10 m acceleration zone plus a 20 m exchange zone, and a simple speed matching approach so both athletes are moving fast at the handoff.
Calculates a go mark (meters behind the start of the acceleration zone) based on the time the outgoing runner needs to accelerate and react, and the incoming runner’s speed approaching the zone.
Suggests an optimal handoff point inside the 20 m exchange zone, with a preference for later exchanges if selected.
Estimates speeds at the handoff for both runners and reports the velocity differential.
Flags common problems, such as large speed mismatch, exchanges that happen too early, or inputs that imply unrealistic conditions.
Visualizes the result on a 30 m diagram and lets you save profiles, compare pairings, and export a practice-ready summary.
Estimates a go mark distance and a handoff point that prioritize later changeovers and speed matching. It uses a simple acceleration model for the outgoing runner and a coach-controlled velocity maintenance setting for the incoming runner.
This is a planning tool, not a replacement for practice-based calibration.
Enter incoming runner values
Max velocity (m/s)
Velocity at the start of the 30 m zone (m/s)
Velocity loss across the 30 m zone (percent), use a small number if the athlete holds speed well
Enter outgoing runner values
Max velocity potential (m/s)
Time to reach 80% max velocity (seconds)
Reaction time (seconds)
Choose optimization settings
Preferred handoff location (late zone options are available)
Combined reach buffer (meters), used as a practical window, not a single exact point
Velocity mismatch threshold (m/s), used for warnings
Read the outputs
Go mark: where to place the check mark behind the acceleration zone start
Handoff point: where the exchange is most likely to be clean and fast
Predicted speeds: incoming vs outgoing speed at the handoff
Velocity differential: smaller is better, large values usually mean the mark is off or the outgoing runner needs more runway
Calibrate on the track
Use the output as a starting point, then do 3–6 practice exchanges.
Adjust the go mark in small steps (example: 0.25–0.50 m) until handoffs consistently happen inside your preferred part of the zone with minimal reaching and no braking.
Save the final settings as a profile for that athlete pairing.
Export and repeat
Save profiles for each exchange pairing, compare them, and export a summary for your relay practice log.
Print the diagram if you want a quick reference at practice.
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