Calculates predicted vital capacity from sex, age, and height using the Baldwin equation and the Japan Respiratory Society equation.
If the calculator does not appear, enable JavaScript and reload. The reference information and official links below still work.
Calculation basis and official references
Reviewed on:
This calculator is not a diagnosis, treatment plan, or prescription. Please consult a qualified clinician about your medical decisions. This equation applies to adults aged 18 and over only.
Formula basis
Baldwin equation: predicted VC (mL) = (27.63 − 0.112 × age) × height(cm) for men, (21.78 − 0.101 × age) × height(cm) for women. JRS equation: predicted VC (L) = 0.045 × height(cm) − 0.023 × age − 2.258 for men, 0.032 × height(cm) − 0.018 × age − 1.178 for women, multiplied by 1000 to display in mL. This implementation displays both results as computed, including decimals.
Calculation method
Calculates predicted vital capacity from sex, age, and height using two equations: the Baldwin prediction equation and the Japan Respiratory Society (JRS) prediction equation published in 2001.
Exclusions and checks required
Both are population regression estimates; actual vital capacity varies significantly between individuals, and an accurate assessment requires a measured test such as spirometry.
The JRS equation was derived for adults (the 2001 committee's study population was age 20 and older). If an age under 18 is entered, this calculator computes and displays the formula's result anyway, which is an extrapolation outside the equation's intended range.
The Japan Respiratory Society also published newer LMS-method reference values in 2014; whether to use the 2001 equations (used by this calculator) or the 2014 LMS equations depends on the institution and purpose.
Example input:：Example for a 40-year-old man, 170 cm tall
sex
Male
age
40
height
170
The predicted value is an estimate from population averages and differs from an individual's measured vital capacity.
従来から使用されてきた肺活量および1秒量予測式と日本人予測式との比較検討The Japanese Respiratory Society (Journal of the Japanese Respiratory Society, vol. 48, no. 5, pp. 357-361, 2010, Aoki Mie et al.)
日本人のスパイログラム基準値に関するステートメントThe Japanese Respiratory Society, Pulmonary Physiology Committee (July 2016)
Who is this calculator for? Predicted Vital Capacity
Calculates predicted vital capacity from sex, age, and height using the Baldwin equation and the Japan Respiratory Society equation.
What values should I enter?
Applies to: Body & metabolism
How should I interpret this estimate?
Calculates predicted vital capacity from sex, age, and height using two equations: the Baldwin prediction equation and the Japan Respiratory Society (JRS) prediction equation published in 2001.
How to use
Enter your input values and press Calculate.
Review the result and compare it with expected context.
Baldwin equation: predicted VC (mL) = (27.63 − 0.112 × age) × height(cm) for men, (21.78 − 0.101 × age) × height(cm) for women. JRS equation: predicted VC (L) = 0.045 × height(cm) − 0.023 × age − 2.258 for men, 0.032 × height(cm) − 0.018 × age − 1.178 for women, multiplied by 1000 to display in mL. This implementation displays both results as computed, including decimals.