# Vital Capacity Estimator (Height / Age / Sex)

Estimate expected adult vital capacity with the Baldwin equations ((27.63 − 0.112×age)×height for males, (21.78 − 0.101×age)×height for females) and optionally grade a measured VC as % predicted. Not medical advice.

> Canonical page: https://elysiatools.com/en/tools/vital-capacity-estimator

- **Category:** Health

- **Keywords:** vital capacity, vc, baldwin equation, predicted vital capacity, spirometry, lung function, pulmonary function test, respiratory physiology, restrictive lung disease, percent predicted

## Overview

The Vital Capacity Estimator calculates expected adult vital capacity (VC) in milliliters and liters using the classic Baldwin regression equations based on sex, age, and standing height. By entering an optional measured spirometry value, it also determines the percent predicted vital capacity and assigns a standard respiratory severity band.

## Inputs

- **Sex** (select): Sex for the Baldwin prediction equation.
- **Height (cm)** (number): Height in centimeters (100–250).
- **Age (years)** (number): Age in years (15–100).
- **Measured Vital Capacity (optional)** (number): Optional measured vital capacity in the selected unit (0.5–9 L or 500–9000 mL); enables % predicted and severity grading.
- **Measured VC Unit** (select): Unit of the measured vital capacity.
- **Decimal Places** (number)

## When to use

- Estimating baseline adult lung volume targets during respiratory physiology or sports science coursework.
- Evaluating measured spirometry results to determine the percent of predicted vital capacity achieved.
- Benchmarking lung function readings against established population reference equations for educational or training reviews.

## How it works

- Select biological sex and enter age in years alongside standing height in centimeters.
- The estimator applies the sex-specific Baldwin equation: `(27.63 − 0.112 × age) × height` for males or `(21.78 − 0.101 × age) × height` for females.
- Optionally input your measured vital capacity in liters (L) or milliliters (mL).
- The tool computes the predicted volume in mL and L, calculates the percentage of predicted VC, and outputs standard severity grading.

## Use cases

- Classroom demonstration of lung volume changes associated with aging, biological sex, and stature.
- Calculating the percent predicted vital capacity for athletes undergoing routine peak performance testing.
- Quickly checking spirometer test values against historical baseline formulas without manual arithmetic.

## Frequently asked questions

### What equations are used to calculate predicted vital capacity?

It uses the Baldwin equations: (27.63 − 0.112 × age) × height (cm) for males and (21.78 − 0.101 × age) × height (cm) for females.

### How is percent predicted vital capacity interpreted?

Values ≥80% are normal, 70–79% indicate mild reduction, 60–69% moderate, 50–59% moderately severe, 35–49% severe, and <35% very severe.

### Can I enter measured vital capacity in milliliters instead of liters?

Yes, you can select either Liters (L) or Milliliters (mL) from the unit dropdown.

### What is the acceptable age and height range for this tool?

The model is designed for adults aged 15 to 100 years with standing heights between 100 and 250 cm.

### Is this tool suitable for formal medical diagnosis?

No, this tool provides population-level reference estimates for educational and informational purposes and is not medical advice.

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