# Using the Formula Field

## Overview

Make your form a math wiz by allowing it to perform calculations. You can total up costs, compare dates, apply discounts, use built-in functions 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.
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

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.

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.

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.

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

Note: If you choose to include unit to the formula calculated value in a Subform, note that the unit will be displayed only in the Subform's Pop-up mode.

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