Formula
Overview
Use the Formula field to set up any form calculation. When your respondents fill in the form, calculations will be performed based on their input. The answer will be displayed in the field you have entered your formula in.
Using the Formula field you can,
- Perform mathematical operations such as addition, subtraction, multiplication, and division
- Use certain math functions to calculate differences between two times, dates, and more
- Set up conditional calculations to perform calculations based on the respondent's answers
Setup
To add a formula field to your form,
- Click the Formula field under the Number section.
- In the pop-up, your form fields would appear in the left pane. Use the fields on the left, numbers, and mathematical operators on the right to come up with your formula.
- Click Done.
- You can choose to hide this field from your respondents using the Hide Field option under Properties.
- If you wish to edit your formula, click the Edit link under Properties .
Number, Decimal, Currency, Slider, Rating, Formula, Radio, Checkbox, Multiple Choice, Dropdown, Image Choice, Date, Date-Time, Time.
f1= n1+ n2
f2= n3 + f3
f3= f1 + f2
Formula 2 depends on Formula 3's answer (and vice versa) to perform calculations, resulting in an endless loop. Recheck your formula to avoid this type of infinite loop.
Functions
Using the math functions we support, you can calculate the differences between time and date fields, and also round off decimal numbers into integers. You will find Functions in the right pane of the Formula field pop-up.
To use a function,
- Tap on the math function you wish to add.
- It generates a syntax like this: Function (Field Name - Field Name) .
- Replace the field's placeholders with the required form fields by clicking them from the left pane.
Supported Math Functions
|
Function |
Role |
Supported Field Types |
|
DayDiff |
Returns the day difference between two date values |
Date, Date-Time |
|
MonthDiff |
Returns the month difference between two date values |
Date, Date-Time |
|
YearDiff |
Returns the year difference between two date values |
Date, Date-Time |
|
HourDiff |
Returns the hour difference between two time values |
Time, Date-Time |
|
MinutesDiff |
Returns the minute difference between two time values |
Time, Date-Time |
|
RoundUp |
Rounds off the decimal number to that next value, away from zero |
Decimal, Currency, Formula |
|
RoundDown |
Rounds off the decimal number to that of the previous value |
Decimal, Currency, Formula |
|
Round |
Rounds off a decimal number to that of the next number when the decimal value is .5 or above, and to the previous number when the decimal value is below .5 |
Decimal, Currency, Formula |
Adding a Unit to Formula
You can add a unit to your formula to show the result more contextually in the live form. A unit can be added once the formula configuration is completed.
To include a unit for the formula calculated value:
- Enter a suitable Unit under Properties .
-
You can select to position this unit either as a Prefix or a Suffix.
Note : The unit for a formula will be displayed only in Subform's Pop-up mode.
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