How are race corrals determined?

Most large races assign corrals based on your predicted or proven finish time. Faster runners start at the front to reduce congestion. Some events use previous race results while others rely on your submitted estimated time.

Can I change my corral assignment?

Some races allow corral changes before race day if you can provide evidence of a faster finish time. On race day, moving to a faster corral is generally not allowed, but you can usually drop back to a slower one.

How much time does a later corral add?

Each corral typically adds 30-60 seconds of delay before you cross the start line. For large marathons, back corrals may face 5-10 minutes of delay. Your chip time starts when you cross the mat, not the gun time.

Should I submit a faster time to get a better corral?

No. Starting too fast leads to early fatigue and a poor race. Being in the right corral means you run with people of similar pace, which helps with pacing and reduces weaving through crowds.

RunCalcs

Corral Calculator — Estimate Your Race Corral

Estimate your starting corral placement based on your predicted finish time.

Expected Finish Hours

Expected Finish Minutes

Race Distance

Total Corrals

Fastest Corral Finish Time

Slowest Corral Finish Time

How We Calculate This

Corral Placement Estimation

The calculator distributes corrals linearly across the finish time range:

Position = (Your Time - Fastest Corral Time) / (Slowest - Fastest)

Corral Number = Position x Total Corrals (rounded up)

Start delay is estimated at approximately 45 seconds per corral behind the first. Actual delays vary by event size and organisation.

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.