Bedridden Patient Height Estimator
Quickly approximate height when patients cannot stand. Choose between ulna length or knee height equations validated for adult populations.
Measurement Method
Select the anthropometric method you collected. Ulna length is simplest; knee height requires calipers.
Estimated Height
Height (centimeters)
200.3 cm
Height (ft / in)
6′ 6.9″
Details & tips
- Ulna length input: 27.0 cm
- Derived from BAPEN (British Association for Parenteral and Enteral Nutrition) guideline using ulna length measurements.
- Measure from the olecranon to the styloid process with the elbow flexed.
How to Use This Calculator
Select the method
Ulna length is measured from the elbow’s olecranon to the wrist’s styloid process. Knee height uses sliding calipers with the leg at 90°.
Enter accurate values
Measure in centimeters. Ensure the limb is relaxed and straight. Take two readings and average them if possible.
Apply clinically
Use the estimated height to calculate BMI, nutrient needs, or medication doses when standing height cannot be taken.
Formula
Ulna Length (BAPEN guideline)
Male: Height = 100 + (3.9 × Ulna length cm)
Female: Height = 95 + (3.9 × Ulna length cm)
Knee Height (Chumlea equation)
Male: Height = 64.19 + (2.02 × Knee height cm) − (0.04 × Age years)
Female: Height = 84.88 + (1.83 × Knee height cm) − (0.24 × Age years)
Ensure consistent measurement units. Formulas are validated for adults aged 18 and above.
Why Height Estimation Matters
Accurate height is essential for calculating BMI, adjusting ventilator settings, determining medication doses, and setting nutrition goals. For bedridden or wheelchair-bound patients, estimation equations provide a practical alternative to standing measurements.
Use consistent technique and, where possible, confirm with multiple methods. Document which method you used in the patient chart for clarity.
Frequently Asked Questions
Can I use this calculator for children?
No. The presented formulas are validated for adults. Pediatric patients require age-specific anthropometric equations.
What if the patient has limb deformities?
Choose the limb with the least deformity or switch to an alternative method (such as demi-span). Document measurement challenges.
How accurate are these estimates?
Expect ±3 cm variability. Always pair results with clinical judgement and other patient data.
Do I need specialized equipment?
Ulna length requires only a tape measure. Knee height uses sliding calipers, but a rigid ruler and right-angle block can substitute carefully.