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# CREFF Formula

MichaelBartmess.CREFF Formula

The **CREFF Formula** calculator computes a person's ideal weight based on the **CREFF formula** which uses a person's height (**ht**), age (**A**) and a physical factor (**M**) on the body type.

**INSTRUCTIONS:** Choose units and enter the following:

- (
**A**) This is the age of the person. - (
**ht**) This is the height of the person (Minimum of 92 cm) - (
**M**) This is morphology factor based on a physical characteristic (see below). Choose one from the menu.

**Ideal Weight:** The calculator returns the weight in kilograms. However, this can be automatically converted to other units (e.g. pounds) via the pull-down menu.

**Related Calculators:**

- (BMI) To compute the body mass index, CLICK HERE.
- (BMI Interpreted) To compute an interpreted result of BMI, CLICK HERE.

#### The Math / Science

This physiology equation computes an approximation of the Ideal Weight of a human. Experts have come up with many different ways to estimate a person's ideal weight (e.g. Body Mass Index). This is just one of many but this equation takes into account body morphology.

The CREFF formula is as follows:

`IW = ht - 100 + \frac{A}{10} * 0.9 * M`

where:

- IW is the Ideal Weight (CREFF)
**ht**is the height of the person**A**is the age of the person in years**M**is the body morphology factor

Body Mass Index (BMI) and ideal weight calculators derive their equations from empirical data. A clinical professional gathers data on healthy individuals and then fits an equation to the data. The CREFF equation is no different. Because the data is fit to a set of data derived from a study of normal individuals, the data will not cover the entire range of all body types, or ages.

**Morphology Factor (M)**

To determine what body type one should consider the person. To use an appropriate factor (**M**), place the middle finger and thumb of your right hand around your left writs:

- Select
**Small**if your thumb slightly overlaps your middle finger. (M = 0.9) - Select
**Average**if you thumb and finger just touch. (M = 1.0) - Select
**Broad**if your thumb and finger do not touch. (M = 1.1)