DASI Calculator (Duke Activity Status Index)

The DASI questionnaire evaluates functional capacity by assigning specific point values to daily tasks, ranging from basic self-care to strenuous sports. The final DASI score is the sum of all affirmative activity points. This score is then used in a validated linear regression equation to estimate peak oxygen uptake (VO2 peak): VO2 = (0.43 * DASI score) + 9.6. Finally, metabolic equivalents (METs) are derived by dividing the estimated VO2 by the standard resting metabolic rate of 3.5 mL/kg/min: METs = VO2 / 3.5.

Imagine a 55-year-old patient evaluating their functional fitness. They report being able to perform personal care (2.75 points), walk indoors (1.75 points), walk a block or two outdoors (2.75 points), climb a flight of stairs or a hill (5.50 points), do light housework like dusting (2.50 points), and engage in moderate sexual relations (5.25 points). Summing these affirmative tasks yields a DASI score of 20.5. Next, we calculate the estimated VO2 peak: VO2 = (0.43 * 20.5) + 9.6 = 18.415 mL/kg/min. Finally, converting this to METs gives: METs = 18.415 / 3.5 = 5.26 METs, indicating moderate functional capacity.

When completing the DASI questionnaire, be strictly honest about your current capability rather than your best historical performance. If an activity causes severe shortness of breath or chest pain, it should not be checked as achievable. Always discuss your calculated METs and VO2 peak with a qualified healthcare provider before making major lifestyle changes or undergoing medical procedures.