How to use this calculator
- 1
Select your race distance
Choose any distance from 1500m through marathon. A recent 5K or 10K at full effort gives the most accurate VDOT.
- 2
Enter your finishing time
Type your hours, minutes, and seconds exactly as they appear on your race result or GPS watch.
- 3
Click Calculate
Your VDOT score, five training paces (Easy through Repetition), and equivalent race predictions appear instantly.
- 4
Apply the paces in training
Copy your Easy and Threshold paces into your training log. Easy pace covers most of your weekly mileage; Threshold pace goes into tempo runs.
What is a VDOT calculator?
A VDOT calculator converts a recent race time into a VDOT score — a number representing your aerobic fitness — and then outputs precise training paces for all five Jack Daniels intensity zones. Developed by exercise physiologist Jack Daniels, VDOT is the foundation of the world's most widely used running training system.
Unlike lab-measured VO2max, VDOT is derived from race performance and accounts for running economy, making it accessible to every runner. The Jack Daniels VDOT calculator above accepts any distance from 1500m to marathon.
The five Jack Daniels training zones
| Zone | Name | % VO₂max | Purpose | Typical workout |
|---|---|---|---|---|
| E | Easy | 59–74% | Aerobic base, recovery | Daily easy runs, long runs |
| M | Marathon | 75–84% | Goal marathon pace | Marathon-pace long runs |
| T | Threshold | 83–88% | Lactate threshold | 20–40 min tempo or cruise intervals |
| I | Interval | 97–100% | VO₂max development | 5×1K, 4×1200m at I pace |
| R | Repetition | 105%+ | Speed & running economy | 200m/400m reps at R pace |
How to use each training pace
Each zone has a specific physiological purpose. Using the wrong pace for a workout defeats the training stimulus.
E — Easy
Use for 65–75% of your total weekly mileage — all daily runs and your long run. Easy pace builds aerobic base, promotes recovery between hard sessions, and lets you train frequently without excessive fatigue. The most common mistake: running Easy too fast. If you can't hold a full conversation, you're too fast.
M — Marathon
Goal race pace for marathon training. Used in marathon-pace long runs (e.g., 15–20 miles with the last 8–10 at M pace). Only relevant if you're actively training for a marathon — skip this zone for 5K/10K training blocks.
T — Threshold
"Comfortably hard" — hard enough to feel it, but sustainable for 20–40 minutes. Do 20–40 min tempo runs or cruise intervals (3–5 × 1 mile with 1 min recovery). Limit to 1–2 T sessions per week. Threshold training directly raises the pace you can race at before lactate accumulates.
I — Interval
VO₂max development — very hard, near maximal effort. Typical sessions: 5×1K, 4×1200m, or 3×1 mile with 2–3 min full recovery between reps. One I session per week is sufficient. Reps shorter than 3 minutes don't fully stress VO₂max; reps longer than 5 minutes exceed it.
R — Repetition
Short, fast reps at mile race pace or slightly faster. Used for 200m or 400m repeats with full recovery (e.g., walk/jog equal distance). Develops running economy, turnover, and neuromuscular coordination. R pace is not a sprint — it should feel fast but controlled with good form.
VDOT reference table — 5K to marathon
| VDOT | 5K | 10K | Half Marathon | Marathon | Level |
|---|---|---|---|---|---|
| 30 | 36:40 | 1:16:00 | 2:46:00 | 6:00:00 | Beginner |
| 35 | 30:40 | 1:03:46 | 2:19:44 | 4:49:17 | Beginner |
| 40 | 26:21 | 54:44 | 2:00:24 | 4:09:44 | Recreational |
| 45 | 23:22 | 48:30 | 1:46:27 | 3:41:32 | Recreational |
| 50 | 21:05 | 43:47 | 1:36:10 | 3:20:59 | Competitive |
| 55 | 19:10 | 39:50 | 1:27:18 | 3:03:45 | Competitive |
| 60 | 17:34 | 36:33 | 1:20:09 | 2:49:44 | Sub-elite |
| 65 | 16:14 | 33:45 | 1:14:02 | 2:37:55 | Sub-elite |
| 70 | 15:06 | 31:22 | 1:08:52 | 2:27:57 | Elite |
| 75 | 14:07 | 29:22 | 1:04:25 | 2:19:44 | Elite |
Frequently asked questions
What is a VDOT calculator?
A VDOT calculator converts a recent race time into a VDOT score — a number representing your current aerobic fitness — then outputs your optimal training paces for all five Jack Daniels intensity zones (Easy, Marathon, Threshold, Interval, Repetition). It was developed by exercise physiologist Jack Daniels and is used by millions of runners worldwide.
How does the Jack Daniels VDOT calculator work?
The calculator uses Jack Daniels' published formula to derive a VDOT value from your race velocity and time. It accounts for the fact that running economy improves during longer efforts by applying an exponential time correction. The resulting VDOT is then used to compute training paces at specific %VO2max targets: Easy (70%), Marathon (80%), Threshold (86%), Interval (98%), and Repetition (105%).
What is a good VDOT score?
VDOT below 35 is beginner, 35–45 recreational, 45–55 competitive club runner, 55–65 sub-elite, above 65 elite. A VDOT of 42 corresponds roughly to a 45-min 10K or 3:45 marathon. Most recreational runners are in the 35–50 range. Elite marathoners like Eliud Kipchoge have VDOT values above 85. Your VDOT is most useful as a personal benchmark — focus on improving your own number over time.
What is VDOT Easy pace used for?
Easy pace (E) is used for the majority of your weekly mileage — typically 65–75% of total volume. It builds aerobic base, promotes recovery, and allows high training frequency without excessive fatigue. Easy runs should feel genuinely conversational. Running Easy too fast is one of the most common training mistakes and leads to accumulated fatigue without extra benefit.
What is VDOT Threshold pace?
Threshold pace (T) — also called comfortably hard — corresponds to roughly 83–88% VO2max. At this intensity, blood lactate accumulates slightly faster than it can be cleared. Threshold training raises the pace you can sustain before lactate accumulation accelerates, directly improving race performance from 5K to marathon. Typical threshold workouts are 20–40 minutes of continuous running or cruise intervals (3–5 × 1 mile with 1 min rest).
How often should I recalculate my VDOT?
Recalculate after every race or every 6–8 weeks of consistent training. As fitness improves, your VDOT rises and training paces should adjust. Using outdated paces — too easy or too hard — reduces the precision of your training stimulus and can slow progress.
Can I use a half marathon or marathon time for the VDOT calculator?
Yes. The VDOT formula accepts any race distance. Shorter races (5K–10K) where you run at true maximum effort give the most accurate VDOT values. Longer races (half marathon, marathon) may slightly underestimate VDOT if pacing was conservative or conditions were poor. A 10K at full effort is the ideal input distance for most runners.
What is the difference between VDOT and VO2 max?
VO2 max is the maximum rate of oxygen consumption measured in a laboratory. VDOT is a performance-derived equivalent that reflects both VO2 max and running economy. Two runners can have the same VO2 max but different VDOT values if one is more economical. Because VDOT requires only a race time, it is far more practical for everyday training prescription.