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## Compute Value
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Modified on: Mon, 23 Nov, 2020 at 6:05 AM

**To better understand this section, it is suggested that you first read:** Conditional Actions – Explained and Accessibility

The Compute Value Conditional Action allows a User to build an assortment of arithmetic operations with a variety of operands.

You do not need a trigger field to fire a compute button. The calculation will fire always on save or if you hit the calculator icon next to the field to be computed. **See Fig 2 for example of a calculator for the TrialKit web.**

1) When a user selects the Conditional Action type Compute Value

2) A dialog box opens at the bottom of the Conditional Actions Builder as shown in the figure below.

The example below is a compute for age

Fig 1

**Operators are as follow:**

**+ = Addition**

**- = Subtraction**

*** = Multiply**

**/ = Divide**

**, = Comma (operator)**

**BMI Sample Formula:**

Formula: weight (lb) / [height (in)]^{2} x 703

Calculate BMI by dividing weight in pounds (lbs) by height in inches (in) squared and multiplying by a conversion factor of 703.

Example: Weight = 220 lbs, Height = 6’0″ (72″)

Calculation: [220 ÷ (72)^{2}] x 703 = 29.8

Fig 2

TrialKit web example of BMI calculation

TrialKit application example of BMI calculation

Another way is to do a scoring field on the web is to add up the fields as shown below in Fig 3 below:

The condition will look like Fig 4 below: Notice how there are no trigger fields used. The calculator next to the field will compute or on save of form it will always compute.

**Some other useful calculations**

**Body Surface Area (BSA)**

(0.007184) * (POW(heightvalue,(.725)) * (POW(weightvalue,(.425))

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