What is VDOT? How to Find Your Running Training Paces in 5 Minutes

VDOT is a measure of a runner's aerobic fitness derived from actual race performance, developed by exercise physiologist Jack Daniels in his book Daniels' Running Formula. Unlike VO2max — which requires a lab test — VDOT is entirely practical: you take your most recent race result and it gives you precise training paces for every type of workout.

If you've ever wondered why your marathon plan says "run at 5:20/km" but you have no idea where that number came from, VDOT is the answer.

What does VDOT actually measure?

VDOT is an estimate of your "effective" aerobic capacity. Daniels created it because two runners with the same lab-measured VO2max can race at very different performance levels due to running economy — how efficiently they convert oxygen into speed.

VDOT captures both in one number. A runner with a VDOT of 50 will perform roughly the same across all race distances, whether 5K or marathon, because the score is calibrated from actual racing — not lab conditions.

The higher your VDOT, the faster you are. Most recreational marathon runners fall between VDOT 35 and 50. Elite runners exceed VDOT 75.

How to calculate your VDOT score

You need one recent race result — ideally completed within the last 8 weeks and run at full effort.

Step 1: Take your most recent race distance and finishing time.

Step 2: Use the VDOT table below to find your score.

Step 3: Use that score to find your training paces.

VDOT reference table — common race times

Source: Daniels' Running Formula, 3rd Edition (2014)

Find the row that best matches your recent race time. That's your VDOT.

The 5 training pace zones from VDOT

Once you have your VDOT, Daniels defines five workout intensities, each with a specific physiological purpose:

E pace — Easy (aerobic base building)

The most common training pace. Should feel genuinely comfortable — conversational, relaxed. Used for most daily runs, long runs, and recovery.

Purpose: Build aerobic capacity without excess stress. Represents 60-79% of max heart rate.

Example at VDOT 50: ~6:20–7:00/km

M pace — Marathon pace

The pace you plan to race your marathon. Used in longer workouts during the peak phase of training.

Purpose: Teach your body to burn fat efficiently at race pace. Trains the metabolic demands of marathon distance specifically.

Example at VDOT 50: ~5:10/km

T pace — Threshold / Tempo

Comfortably hard. This is your lactate threshold pace — the fastest pace you can sustain for approximately 60 minutes in a race.

Purpose: Raise your lactate threshold, directly improving your marathon and half marathon pace ceiling.

Example at VDOT 50: ~4:42/km

I pace — Interval

Hard effort. Used in short intervals (typically 3-5 minutes per rep) with recovery between.

Purpose: Improve your VO2max — the ceiling of your aerobic system.

Example at VDOT 50: ~4:15/km

R pace — Repetition

Very fast, short efforts (200-400m). Run at mile pace or faster, with full recovery.

Purpose: Improve running economy and speed. Not about cardiovascular stress — about neuromuscular efficiency.

Example at VDOT 50: ~3:52/km

Why VDOT matters more than generic pace charts

Most running apps give you paces based on a heart rate zone or a generic "beginner / intermediate / advanced" category. These are estimates at best.

VDOT is derived from your actual performance. It accounts for your fitness level, your running economy, and your current state of training — all in one calculation. When you improve your VDOT, every training pace automatically recalibrates.

This is why Zarkus uses VDOT as the foundation of every training plan. When you log a new race or time trial, your training zones update. Your easy pace changes. Your threshold intervals change. The whole plan shifts — not because someone decided to "make it harder," but because your physiology changed.

How often should you update your VDOT?

Daniels recommends recalculating after any race or flat time trial run at full effort. For most runners in structured training, this means:

• Base phase: Update after a 5K or 10K tune-up race
• Build phase: Update after a half marathon or fast 10K
• Before a marathon: Use your most recent relevant test

Avoid using a race run in extreme heat, at altitude, or with significant elevation gain — these will underestimate your fitness.

Common VDOT mistakes

Using a race from more than 12 weeks ago. Your fitness has likely changed, making the paces inaccurate.

Using a bad race. A race where you went out too fast, ran sick, or had a mechanical problem will give a distorted VDOT. Use a well-executed effort.

Ignoring E pace. Many runners skip easy runs or run them too fast. Easy pace should feel almost embarrassingly slow. This is intentional — it builds your aerobic base without accumulating excess fatigue.

Training at T pace every day. Threshold pace is effective precisely because it's hard. Daniels' research found that most runners respond best to approximately 10% of weekly mileage at T pace. More than that increases injury risk without proportional benefit.

VDOT is the most practical tool available for self-coached and technology-assisted runners. It removes the guesswork from training intensity and gives you a scientific baseline that updates as you improve.

If you want a plan that automatically applies VDOT to every week of your race preparation — and adapts when your fitness changes — that's exactly what Zarkus is built for.

Frequently Asked Questions

What is a VDOT score in running?

VDOT is a measure of effective aerobic capacity derived from actual race performance, developed by exercise physiologist Jack Daniels. Unlike lab-measured VO2max, VDOT is calculated from a recent race result and gives you precise training paces for every workout type — easy runs, threshold, intervals, and repetitions.

How do I calculate my VDOT from a race time?

Take your most recent race result (ideally within the last 8 weeks, run at full effort) and match it to the VDOT reference table. For example, a 10K in 44:18 corresponds to a VDOT of 50. That number then maps directly to training paces for all five intensity zones defined by Daniels Running Formula.

How often should I update my VDOT?

Jack Daniels recommends recalculating VDOT after any race or flat time trial run at full effort. In practice: update after a tune-up race during base phase, after a half marathon or fast 10K during the build phase, and before each marathon cycle. Avoid using races run in extreme heat, at altitude, or with significant elevation gain as these will underestimate your fitness.