Jack Daniels' Running Calculator


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Select one advanced input. See effects in table below.

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Advanced Features
Wind, temperature, and altitude effects

Distance 1Mi 1K 800m 400m
Results will display here.

Easy Pace

Variety: Easy pace running refers to warm-ups, cool-downs , recovery runs, recovery running within a workout and generally long runs.

Intensity: Generally in the range of 59-74% of VO2max or 65-79% of your HRmax. In general, Easy running is running at a comfortable, conversational pace, which certainly may vary daily, depending on how you are feeling. You may be up to 20 seconds slower or faster than the specified pace on a given day.

Purpose: Running at your Easy pace promotes physiological benefits that build a solid base from which higher-intensity training can be performed. The heart muscle is strengthened, muscles receive increased blood supplies and increase their ability to process oxygen delivered through the cardiovascular system.

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Marathon Pace

Variety: Steady run or long repeats (e.g. 2 x 4 miles at marathon pace)

Intensity: Generally in the range 75-84% of VO2max or 80-90% of your HRmax.

Purpose: Used to experience race pace conditions for those training for a marathon or simply as an alternative to Easy pace running for beginners on long run days.

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Rep Pace

Variety: Pace reps and strides.

Intensity: Reps are fast, but not necessarily "hard," because work bouts are relatively short and are followed by relatively long recovery bouts. Recoveries are to be long enough that each run feels no more difficult than the previous run, because the purpose of Reps is to improve speed and economy and you can not get faster (nor more economical) if you are not running relaxed. If it takes 3 minutes recovery between Rep 400s, then that is what is needed. Reducing rest time between individual work bouts does not make for a better workout, in fact it probably makes for a worse workout because the short rests could increase the stress and lead to poor economy. Think of Reps as similar to current 1500 or mile race pace.

Purpose: To improve your speed and economy.

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Interval Pace

Variety: VO2max Intervals (see below).

Intensity: Generally in the range of 95-100% of VO2max or 98-100% of HRmax. Intervals are "hard" but not all-out running by any means. Usually at a pace that you could maintain for about 10-15 minutes in a serious race. Intervals are best if they involve runs of 3 to 5 minutes each (800m and 1000m workbouts are typical), with jog recoveries of similar duration (not necessarily, equal distance); relative to the runs they follow. If a workout calls for "hard" runs, then go by feel and imagine 5k race pace, as he intensity of each run.

Purpose: Stress your aerobic power (VO2max). It takes about two minutes for you to gear up to functioning at VO2max so the ideal duration of an "Interval" is 3-5 minutes each. The reason not to go past 5-minutes is to prevent anaerobic involvement, which can result in blood-lactate build-up.

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Threshold Pace

Variety: Steady, prolonged or tempo runs or intermittent runs, also called cruise intervals.

Intensity: Generally in the range of 83-88% of VO2max or 88-92% of HRmax. Threshold pace is comfortably hard running for either a steady 3-4 miles (or 5 to 6km) or repeated runs of 5 to 15 minutes each, with 1 to 3 minutes of rest between the runs.

Purpose: To improve endurance.

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Advanced Features - Effect

Are you anticipating this wind, temperature or altitude?

If you have an upcoming race or workout and want to know how wind, temperature or altitude will affect the performance:

  1. Add in a race result or a race performance that represents what type of shape you are in
  2. Select “Anticipate Performance” and then enter the condition
  3. Click calculate to find out what the effect will be

Are you trying to find the effect wind/temp/alt had on your performance?

If you’ve run a race and want to find out what effect wind, temperature or altitude had on your performance:

  1. Input your race result
  2. Select “Race Results” and then enter the condition
  3. Click calculate to find out how much the condition hurt your performance
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Equivalent Performances

Jack’s VDOT system can relate performances over unlimited distances and can be used to figure out what type of shape you’re in for other races. If you just ran 45:16 for 10K and want to know what the equivalent performance is for the marathon it will tell you 3:28:26. This information is great for measuring your fitness and setting goals in upcoming races based on previous performances.

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