Enter your VO₂ (ml/kg/min) and running speed (km/h) to calculate your Running Economy — the oxygen cost per kilometer of body weight. You can also reverse-calculate VO₂ from a known running economy score and speed. Results include your economy score, a benchmark category, and a breakdown chart. Also try the Running Pace Calculator.
Running Economy
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VO₂ at Speed
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Running Speed
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Economy Category
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Equivalent Pace
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Running economy (RE) is the oxygen cost of running at a given speed, expressed in milliliters of oxygen per kilogram of body weight per kilometer (ml/kg/km). A lower number means better efficiency — you use less oxygen to cover the same distance. It is one of the key determinants of endurance running performance alongside VO₂max and lactate threshold. See also our Estimated Finish Time — Half Marathon Pace.
Running economy is calculated using the formula: RE = (VO₂ × 60) / Speed, where VO₂ is in ml/kg/min and speed is in km/h. This converts the per-minute oxygen consumption into a per-kilometer cost. For example, a runner using 45 ml/kg/min at 12 km/h has a running economy of 225 ml/kg/km.
Running economy determines how efficiently you translate aerobic capacity into speed. Two runners with identical VO₂max values can have very different race performances if one has better running economy. Improving economy can be as impactful as raising VO₂max, since it dictates how close you can run to your aerobic ceiling for extended periods.
Elite male distance runners typically show values of 180–200 ml/kg/km, while elite female runners range 185–210 ml/kg/km. Recreational runners generally fall between 220–270 ml/kg/km. The lower the score, the more economical the runner. World-class athletes like Eliud Kipchoge have been measured well below 200 ml/kg/km. You might also find our use the Trail Distance Calculator useful.
Key factors include running biomechanics (stride efficiency, cadence, arm swing), strength training (especially plyometrics and resistance work), flexibility, footwear (lightweight or carbon-plated shoes), altitude training, and overall training volume. Even small improvements in form and strength can meaningfully reduce oxygen cost per kilometer.
VO₂max is the maximum rate at which your body can consume oxygen — it sets your aerobic ceiling. Running economy, by contrast, measures how much oxygen you actually use at a submaximal pace. An athlete with a moderate VO₂max but excellent running economy can outperform someone with a higher VO₂max but poor efficiency.
Yes. Switch the calculation mode to 'Running Economy + Speed → VO₂' and enter your known running economy (ml/kg/km) and speed (km/h). The calculator will derive the corresponding VO₂ in ml/kg/min, which is useful when you have lab economy data and want to estimate oxygen demand at different speeds.
Running economy is always measured at a specific speed — it is not a fixed physiological constant. As speed increases, oxygen consumption rises and the economy value (ml/kg/km) typically increases too, meaning higher oxygen cost per kilometer. This is why economy comparisons should always reference the speed at which the measurement was taken.