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FitAge
Are you fitter than your age suggests? Find out.
Fitness age compares your VO₂ max against population norms for different ages — a 50-year-old with the VO₂ max typical of a 35-year-old gets a fitness age of 35, a motivating reframe of raw fitness numbers.
Research popularizing this metric (notably from Norway's HUNT study) found that fitness age tends to resonate more with people than an abstract VO₂ number, since 'you're 10 years younger than your age' is instantly meaningful.
Daily energy expenditure with personalised macro splits.
OpenBody mass index with healthy-range guidance.
OpenUS Navy circumference method for body fat percentage.
OpenDaily hydration target based on weight, activity, and climate.
OpenFitness age
28.6
Rough model: chronological age adjusted by how far VO₂max is above/below the average for your age.
What you entered
Average VO₂ max for your age
48 − 0.5 × max(0, 30−20)= 43.0 ml/kg/minCompare to your VO₂ max
45 − 43.0= 2.0 ml/kg/minAdjust chronological age
30 − (2.0 × 0.7)= 28.6 yearsResult
Fitness age: 28.6
At chronological age 30 with a VO₂ max of 45, your fitness age is 28.6.