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What is VDOT? (And Why It Matters for Your Training)

September 2026 · 7 min read

The Origin

VDOT was developed by Jack Daniels, PhD (yes, named after the drink) as part of his Running Formula system. It's a single number that represents your running fitness — combining your VO2max with your running economy.

How VDOT Works

VDOT is derived from your best recent race performance. A 42:00 10K and a 1:33:00 half marathon should produce roughly the same VDOT, because they represent the same aerobic fitness level.

• VDOT 30 → recreational runner (10K ~55 min)
• VDOT 40 → intermediate (10K ~45 min)
• VDOT 50 → competitive (10K ~38 min)
• VDOT 60 → elite (10K ~32 min)

VDOT → Training Paces

The real power of VDOT is that it directly maps to your training paces:

• Easy: ~65% of VDOT intensity (conversational)
• Marathon: ~80% (sustainable for hours)
• Threshold: ~90% (tempo effort, "comfortably hard")
• Interval: 100% (VO2max effort, 3-5 min reps)
• Repetition: ~105% (short, fast reps for economy)

How to Find Your VDOT

Enter your best recent race time into our VDOT Calculator. Use a race from the last 3-6 months — not a PR from 5 years ago.

Tips for accurate VDOT:

• Use a recent race on a similar course (flat vs hilly)
• Race conditions matter — a windy day inflates your VDOT
• If you race both 5K and 10K, use the longer distance (more reliable)

VDOT vs Garmin VO2max

Garmin estimates VO2max from GPS + heart rate. VDOT is derived from actual race performance. They correlate but aren't the same:

• Garmin VO2max is often 5-10 points higher than VDOT
• VDOT is more actionable — it gives you exact training paces
• Garmin's number is useful for tracking trends, VDOT is better for planning