Add a calculated field
Work out values such as BMI automatically from other answers on the same form.
Table of Contents
Add the questions the formula needs, such as weight and height.
Add Calculated Field.
Write the formula using those questions.
Save.
The value updates as answers are filled in, and can't be typed over. Only short answers, dropdowns, single choices and sliders can feed a formula.
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Next, read Let patients list medications in a form.