π Training Pace Calculator
Turn a recent race into your five Jack Daniels training paces.
Your Training Paces (per km)
How to Use This Training Pace Calculator
Guessing workout paces is how runners train too hard on easy days and too easy on hard days. Exercise physiologist Jack Daniels solved this with VDOT, a single number distilled from a race time that sets five precise training paces. Enter one recent race result below and you get your VDOT plus the easy, marathon, threshold, interval, and repetition paces matched to your current fitness.
Pick the distance of a recent all-out race or time trial, from 1 mile to the marathon.
Enter your finishing time. Use a result from the last 6 to 8 weeks so the paces reflect your fitness today, not last season.
Read your VDOT at the top, then the five training paces in minutes per km underneath.
Match each workout to its zone: long runs and recovery at E, tempo sessions at T, track reps at I or R. Re-test when race times improve.
The VDOT Formula
VDOT estimates your maximal oxygen uptake from race performance rather than a lab test. The first equation converts your race into oxygen cost per minute of running. The second estimates what fraction of your maximum you sustained, which falls as races get longer. Dividing the two gives VDOT, a pseudo-VO2max number that Daniels then maps to training paces through tables built from decades of coaching data.
Worked Example: 25:00 5K
Velocity is 5,000 meters divided by 25 minutes, which is 200 m/min. VO2 comes out to 36.01 ml/kg/min, and the sustained fraction for 25 minutes is 0.940, giving VDOT 38.3. The nearest table row is VDOT 40: easy pace 6:07 to 6:44/km, marathon pace 5:27/km, threshold 5:06/km, interval 4:41/km, and repetition 4:25/km. Enter 25:00 for 5K above and you will see exactly this.
The Five Training Zones
Easy (E) pace covers long runs, warm-ups, and recovery days at 59 to 74 percent of VO2max. It should feel conversational, and most runners run it too fast. Marathon (M) pace is your predicted marathon race pace, used for race-specific long runs. Threshold (T) pace, the comfortably hard tempo effort at about 88 percent of VO2max, raises the speed you can sustain and is the single most productive workout for most distance runners. Interval (I) pace near 97 percent of VO2max builds aerobic power through 3 to 5 minute reps. Repetition (R) pace, faster than 5K effort, sharpens speed and running economy through short reps with full recovery.
The weekly mix matters as much as the paces. Daniels-style plans put roughly 80 percent of volume at easy pace, with one threshold session and one interval or repetition session per week. When a race time drops, rerun the calculator: every pace shifts down with the new VDOT, which is exactly how training should progress.
VDOT Limits Worth Knowing
VDOT assumes the input race was a true maximum effort on a fair course. A tactical championship race, a hilly course, or a hot day all produce a VDOT below your real fitness, and the training paces come out too easy. A downhill or short course does the opposite. For the most honest number, use a flat certified course or a track time trial in cool weather. Also note the table here rounds your VDOT to the nearest row of 5, so treat the paces as targets within a few seconds, not laboratory values.
A Sample Week at VDOT 40
Numbers turn into fitness through the weekly pattern. A VDOT 40 runner (25:00 5K) might train like this: Monday 45 minutes easy at 6:07 to 6:44/km. Tuesday warm up, then 20 minutes continuous at threshold 5:06/km, cool down. Wednesday 40 minutes easy. Thursday warm up, then 5 x 1,000m at interval 4:41/km with 3-minute jogs, cool down. Friday rest or 30 minutes very easy. Saturday 90 minutes easy, the long run. Sunday 50 minutes easy, optionally finishing with 6 x 20-second strides near repetition effort.
Notice the proportions: about 80 percent of the time sits at easy pace, one session hits threshold, one hits intervals, and strides add the speed touch. Total volume and the long run grow gradually, never more than about 10 percent per week. When the 5K time drops to 24:00, the VDOT rises, every pace shifts a few seconds faster, and the same week structure continues at the new numbers. That loop, test, adjust, repeat, is the entire Daniels system.
One more rule that keeps the system honest: never train at a faster VDOT than your most recent race earns. Rounding your fitness up feels ambitious, but paces set too fast turn easy days into moderate days and hard days into races, and the whole structure quietly becomes overtraining. Let the race result set the number, and let the number do its job.
Easy Pace: The Zone Everyone Runs Too Fast
The easy zone is where training plans go to die, because "easy" feels embarrassingly slow. Daniels defines easy as roughly 65 to 78 percent of max heart rate, a pace where you can speak in full sentences: the talk test is the field version. Most runners do their easy runs 30 to 60 seconds per mile too fast, which turns recovery into junk mileage: too fast to recover, too slow to build fitness. The discipline of running truly easy is what makes the hard days possible. If your easy pace feels too easy, it is probably right; if it feels productive, it is probably too fast.
The 4-Week Rule: When to Update Your VDOT
VDOT is a snapshot, not an identity. Update it after every race or honest time trial, and never from a workout where you felt great; workouts lie, races do not. Four weeks is the practical rhythm: fitness changes meaningfully on that timescale, and training paces set from a stale VDOT are either too easy (wasted weeks) or too hard (injury risk). One caution: a breakthrough race in perfect conditions overstates your everyday fitness, so experienced coaches discount a PR by a point or two of VDOT for daily training. The calculator gives you the number; judgment decides when to use it.
Why VDOT Beats "Run at 80 Percent Effort"
Effort percentages feel personal but measure nothing: your 80 percent on a hot day after bad sleep is a different pace than your 80 percent fresh. VDOT anchors every zone to a measured performance, so threshold pace means the same physiological thing in July and January. This matters most for tempo and interval work, where the difference between the right pace and 10 seconds too fast is the difference between a breakthrough workout and a breakdown. Subjective effort has its place on easy days; the hard days deserve numbers.
Strides: The 20-Second Speed Vitamin
Strides are 20-second accelerations to roughly mile race effort, run 4 to 6 times after an easy run with full recovery between. They teach your legs turnover without the fatigue of a workout, and Daniels prescribes them year-round. The rules: relaxed, not straining; stop the moment form degrades; never on consecutive hard days. Twenty seconds feels like nothing and does more for your finishing kick than most tempo runs.
For informational purposes only, not medical advice. Consult a healthcare professional before starting or changing training, diet, or sauna use.
Frequently Asked Questions
What is VDOT in running?
VDOT is a fitness score created by coach Jack Daniels that estimates your VO2max from race performance. One all-out race gives you a number, usually between 30 and 85, and that number sets five training paces matched to your current fitness. As you get fitter and race faster, your VDOT rises and every training pace adjusts with it.
How do I calculate my VDOT?
Enter a recent race distance and time into the calculator above. It applies the Daniels formula: velocity gives oxygen cost, race duration gives the sustainable fraction of maximum, and dividing the two gives VDOT. A 25:00 5K works out to VDOT 38.3, for example. No lab test needed.
What pace should my easy runs be?
Find your VDOT from a recent race, then use the easy range from the table. A VDOT 40 runner goes 6:07 to 6:44 per km. Easy pace should allow full sentences without gasping. Most runners go too fast here, which is the most common reason hard workouts feel harder than they should.
What is the difference between threshold and tempo pace?
They are the same thing in Daniels terminology: threshold (T) pace is the comfortably hard effort you could hold for about an hour, roughly 88 percent of VO2max. Tempo is just the popular name for the workout. Twenty minutes continuous or cruise intervals like 4 x 8 minutes are classic T sessions.
What is repetition pace used for?
Repetition (R) pace is faster than 5K race effort and trains neuromuscular speed and running economy, not aerobic fitness. Think 200 to 400 meter reps with full walking recovery. It makes your slower paces feel easier by raising your speed ceiling, and it belongs once a week at most.
How often should I recalculate my VDOT?
After every race or time trial, and roughly every 6 to 8 weeks during a training block. Fitness changes, and paces set from a stale VDOT either hold you back or push too hard. If workouts at the prescribed paces start feeling easy across the board, that is the signal to re-test.
Can beginners use VDOT training paces?
Yes, with one adjustment: beginners should spend their first 6 to 8 weeks running everything at easy pace before adding threshold or interval work. The paces still apply, but the body needs an aerobic base first. Jumping straight into I-pace track sessions is how new runners get injured.
Why do my VDOT paces feel too slow?
Three usual causes: the input race was not a true maximum effort, it was run on a hilly or hot course, or your fitness has improved since. Also check ego: easy pace is supposed to feel almost embarrassingly slow. If threshold and interval paces feel easy too, re-test with a fresh all-out effort.