How to use the calculator block
Perform realtime calculations inside your forms based on given answers. This article describes the basic usage of the calculator block.
When to use
The calculator block really pushes the smartness of your form to the next level. Calculator blocks can perform all kinds of calculations inside your form.
You can use calculations for many use cases, for example:
 Count the scores for a quiz;
 Calculate the prices of selected products for a quote;
 Apply discounts with coupon codes;
 Perform formulas for medical purposes (like a BMI calculator);
 Calculate the age of a respondent for age checks;
 Perform advanced formulas in a wizard.
These are just some examples. Basically you can calculate anything you want with the calculator block. Please have a look at our calculator features overview to see everything you can do with the calculator block.
How to use
The calculator block is available as a question type. Add a new block to your form and then select the question type Calculator
.
You can add unlimited calculator blocks in any position in your form, just how you need them. Inside each calculator block you can perform the needed calculations with all possibilities we sum up in the article below.
Instant calculations inside question blocks
In the article you're reading now, we describe the possibilities of the full calculator block. But you don't always need to add a separate calculator block to your form for each calculation.
We made it easier to use the most common calculator features directly inside question blocks, for example to quickly score the options of a multiple choice question in a quiz.
We wrote a separate article about that: How to add instant scores and calculations inside question blocks.
Basic features
To start with, you can give each calculator block a Description
. We advise to give it a good description, so you can easily see what that calculator does in your form.
Operations
Each calculation block starts with an empty list of Operations
. These operations are the core of the calculator and determine what this block will calculate. Each operation is a step in your calculation. You can add as many operations as you need.
Initial value
To start with, you add the Initial value
to the list of operations by clicking the button at the bottom of the Operations list. That's the starting point of your calculation. There are several options to determine the initial value:
Number
 The most simple initial value is a static number that you enter yourself;Block (given answer)
 You can use given answers of your respondents as the initial value;Score
 You can instantly score selected answers of your respondents;Comparison
 A comparison can check a certain value and determine the initial value;Function
 There are several mathematical functions you can use to get an initial value;Constant
 There are several constants that you can use as an initial value, including dates and times;Subcalculation
 You can begin with a subcalculation. That adds a subcalculation (with full calculation features) to your initial calculation and the outcome will be used as the initial value.
Operations
Next, you supply the operations you want to perform after the initial value. For each operation click the button at the bottom of the Operations list. You can add as many operations as you need to get to the right outcome. The following operations help you with that:
Add
 Add up a value to the outcome of the previous operation;Subtract
 Subtract a value from the outcome of the previous operation;Multiply
 Multiply the outcome of the previous operation with a value;Divide
 Divide the outcome of the previous operation with a value;Equal
 Equal the calculator with a value.
Please have a look at this article for more in depth information about operations.
Operation properties
For each operational step there are lots of options to perform the right calculation. The following options help you to use the right values in your calculations:
Number
 The most simple value is a number that you enter yourself;Block (given answer)
 You can use given answers of your respondents as the value;Score
 You can instantly score selected answers of your respondents;Comparison
 A comparison can check a certain value and perform an action based on the outcome;Function
 There are several mathematical functions you can use;Constant
 There are several constants that you can use, including dates and times;Subcalculation
 You can perform a subcalculation. That adds a subcalculation (with full calculation features) to your operations list that will be executed and the outcome will be used in the parent calculator.
These values make the calculator block a very powerful tool that you can use to calculate anything you need.
Please have a look at these articles for more information about using blocks, scores, comparisons, functions/constants and subcalculations inside calculators.
Additional features
On top of the basic features and all operation options, the calculator block also has the following advanced options to help you with the outcome:

Format
By enabling the
Format
feature, you can determine how many decimal places the outcome of the calculator may contain. 
Signs
By enabling the
Signs
feature, you can set what signs to use as decimal sign and thousands separator. Please note that in your forms these signs can be overwritten by the respondent's locale settings. In your dataset the selected signs always will be used. 
Limit values
By enabling the
Limit values
feature, you can enter a minimum and maximum value that the outcome of the calculator can become. 
Prefix
By enabling the
Prefix
feature, you can enter a label that's shown in front of the outcome of the calculator. Optionally you can specify a different prefix for plural values. 
Suffix
By enabling the
Suffix
feature, you can enter a label that's shown at the end of the outcome of the calculator. Optionally you can specify a different suffix for plural values.
Calculations in logic branches
Special features are built in for calculations inside logic branches. For example to perform calculations in repeating branches.
Please have a look at this article for more in depth information about using calculators inside logic branches.
Outcomes
The outcome of each calculator block is usable in different ways in the rest of your form. You can show it to your respondents, but also use it as the input for other blocks, or perform logic with it. And of course the outcomes are available in your dataset for results, notifications and webhook connections.
Please have a look at this article for more in depth information about using calculation outcomes.
Logic
Logic is important to make your forms smart and conversational. The outcome of the calculator block can work with the following branch conditions to help you with that:
Block conditions
 Calculation is equal to
your filter
;  Calculation is not equal to
your filter
;  Calculation is lower than
your filter
;  Calculation is higher than
your filter
;  Calculation is between
your filters
;  Calculation is not between
your filters
;  Calculation is valid;
 Calculation is not valid.
Filters
When we mention your filter(s)
above, there are some different filters that you can use to make the right comparison:
 Number  Compare with a fixed number that you enter;
 Value  Compare with another block value entered in the form by a respondent (more info).
More information
The calculator block has lots of features, so we have several ways to learn all about it.
Help center
Our help articles help you out on all different aspects of the calculator:
 How to add instant scores and calculations inside question blocks;
 How to use the calculator block (current article);
 How to use operations in the calculator block (add, subtract, multiply, divide, equal);
 How to use given answers from respondents in your calculations;
 How to use scores in your calculations;
 How to use comparisons in your calculations;
 How to use functions and constants in your calculations;
 How to use subcalculations (multistep formulas) in your calculations;
 How to use calculations with logic branches;
 How to use the outcomes of calculator blocks.
Overviews
We also made some overviews of the capabilities that the calculator block provides: