# Ideal weight

The ideal weight can be determined by measuring wrist circumference or elbow breadth. The latter is a more reliable method, because the wrist circumference is highly influenced by a person's body weight.

### Wrist circumferenceMeasuring the wrist circumference

The wrist circumference is measured with a measuring tape. This formula can be used to determine frame size: Height (H) in cm / wrist circumference (C) in cm.

### Elbow breadthMeasuring the wrist circumference

The elbow breadth is measured by using a sliding caliper. The person's right arm is extended forward perpendicular to the body. The arm and elbow form a 90º angle, with the fingers pointing up and the dorsal part of the wrist toward the dietician.  The largest breadth across the elbow joint is used for the measurement.

### Calculating the Percentage Ideal Weight (PIW)

The Percentage Ideal Weight (or Relative Weight Index) expresses which percentage of the ideal weight, is the actual weight. The formula is: Current body weight / ideal bodyweight * 100%.

## Ideal weight

### Reference values

• Reference values for determining ideal weight in adults and the elderly. The frame size can be determined with the aid of the tables in this document.
• Metropolitan Life Table of the  Maastricht University Medical Centre (MUMC+): this hospital has developed a table with a revised height and length:  the Metropolitan Life tabel, based on a test group with people aged 25 - 29 years.