Perform Calculations | Formula Field - Zoho Forms

Using the Formula Field

Overview

Make your form a math wiz by allowing it to perform calculations. You can total up costs, process grade quizzes, apply discounts, and more! 
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.
Formula Field
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  

    Using the Formula Field

Setup

To add a formula field to your form,

  1. Drag and drop or click the Formula field under the Advanced Fields section.
  2. 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.

    Formula field setup
  3. Click Done.
  4. You can choose to hide this field from your respondents using the Hide Field option under Properties
  5. If you wish to edit your formula, click the Edit link under Properties.
For example, you can calculate the amount your customer has to pay using the formula field and display the amount in the payment field automatically. For this, you can set the formula as Item * Quantity, where the numeric value assigned for the field Item will be taken for the calculation.

Supported Field Types for Formula
Number, Decimal, Currency, Slider, Rating, Formula, Radio, Checkbox, Multiple Choice, Dropdown, Image Choice, Date, Date-Time, Time
Note
While using the Formula field as a variable for calculating another formula, ensure that the two formulas are not mutually dependent. If you have come across an error because two formulas are mutually dependent, then refer to the below example:
If  n1, n2, n3 are three number fields, and f1, f2, f3 are the formulas that you have created where,

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,
  1. Tap on the math function you wish to add.
  2. It generates a syntax like this: Function (Field Name - Field Name).
  3. Replace the field's placeholders with the required form fields by clicking them from the left pane. 

    Using functions in Formula field
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
Age
Returns the age in years from the selected date as of the current date. If the selected Date field is left blank, or if the selected date is a future date relative to the current date, the age will be taken as 0.
When calculating age, the months completed are not returned. For example, if the age calculated is 19 years and 7 months, only 19 years is returned.
Date, Date-Time
SelectionCount
Returns the number of options selected in the supported choice based field types. If a choice field (supported field) in Subform is used within the formula, this function returns the sum of all choices selected
Multiple Choice, Checkbox,  Image Choices
CurrentDate
This field is used to return the difference between the current date and the selected date in the DayDiff, MonthDiff, and YearDiff functions
Date, Date-Time

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.

Add Unit to Formula

You can select to position this unit either as a Prefix or a Suffix

Prefix or suffix the unit
Note: The unit for a formula will be displayed only in Subform's Pop-up mode.

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