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Go Mark Calculator
Enter your team code to get started
Team Access
Enter Your Team Code
Your coach will provide a short team code. Enter it below to connect to your team's athlete data.
Team code not found. Check with your coach and try again.
Team codes are provided by your coach. They are not case-sensitive.
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Coach Setup
One-time team configuration
Step 1 — Share Your Google Sheet
Open your Go Mark Google Sheet, go to File → Share → Share with others
and set access to Anyone with the link → Viewer.
Step 2 — Copy Your Sheet ID
It's the long string between /d/ and /edit in your sheet's URL.
docs.google.com/spreadsheets/d/YOUR-ID-HERE/edit
Step 3 — Create Your Team
Enter your Sheet ID and choose a short team code your athletes will use to log in.
Could not connect. Check that the Sheet ID is correct and the sheet is set to public viewer access.
Keep it short and memorable — no spaces or special characters. Athletes use this to connect without any other setup.
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Go Mark
4×100 Exchange Calculator
⚠ Offline — showing cached data
Could not load athlete data.
Check your internet connection or tap Settings → Reload.
Runner Selection
Loading roster…
Optimal Exchange Zone Marks
Select both runners to calculate the exchange mark.