What this calculator does
Estimated height from knee height works out standing height for a patient who cannot be measured directly (Chumlea equations). Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaWhite women: 70.25 + 1.87×KH − 0.06×age · Black women: 68.1 + 1.86×KH − 0.06×age · White men: 71.85 + 1.88×KH · Black men: 73.42 + 1.79×KH (KH cm, age years)
The inputs explained
| Field | What to enter |
|---|---|
| Knee height (cm) | A number, measured in cm. Starts at 50. |
| Age (years) | A number, measured in years. Starts at 65. |
| Sex | Choose from Male, Female. |
| Race | Choose from White, Black. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with knee height
Every other input is held at the calculator’s starting values while knee height varies. Select any row to load that scenario into the calculator.
How the answer changes with knee height
| Knee height (cm) | Estimated height | In feet & inches | Source |
|---|---|---|---|
| 25 | 118.9 cm | 3 ft 11 in | Chumlea et al. knee-height equations, developed for patients who cannot stand or lie flat to be measured. |
| 37.5 | 142.4 cm | 4 ft 8 in | Chumlea et al. knee-height equations, developed for patients who cannot stand or lie flat to be measured. |
| 50 | 165.9 cm | 5 ft 5 in | Chumlea et al. knee-height equations, developed for patients who cannot stand or lie flat to be measured. |
| 75 | 212.9 cm | 6 ft 12 in | Chumlea et al. knee-height equations, developed for patients who cannot stand or lie flat to be measured. |
| 100 | 259.9 cm | 8 ft 6 in | Chumlea et al. knee-height equations, developed for patients who cannot stand or lie flat to be measured. |
| 150 | 353.9 cm | 11 ft 7 in | Chumlea et al. knee-height equations, developed for patients who cannot stand or lie flat to be measured. |