# I need a form that has a simple calculation behind it.

**prowl00**I am asking a question using checkboxes with 5 options.

When users select an option the form calculates the values and adds it to a field at the bottom.

Normally each selection has a value of 1 so if a user selects the third option then the number that is added is 3 and so on.

The issues here is that the calculation needs to start from 0 not 1. Is there any way to do this Jot Form? I was trying to see if there was a way to minus 1 point from the end result whenever the first selection was chosen. Not sure this is possible?So as an example in the first five questions if the first answer was 1 and the rest 2s then the total would be 8 instead of 9

So the first option in every line is a zero the second option is 1, the third option is 2 and so on.

As a user completes the form the number is added and displays an image that represents what the total is so if the total is 10 the image that displays represents a 10.

You can view a sample of the form here http://form.jotform.ca/form/42983937062262?- JotForm Support
**jonathan**I suggest reviewing this 2 JotForm user guides which describe how to achieve this.

#1.

**-How-to-Assign-Calculation-Value**first, you need to

**Assign Calculation Value**to options in your form#2

**-How-to-perform-calculation-in-the-form**Then, create the calculations...

The 1st assign value doesn't have to be at zero(0), assign a positive number then and just add calculation to get total result.

You can test my demo form http://www.jotformpro.com/form/50357948598979

The assign value is 1-5 (/3 because there are 3 items)

Hope this help. Let us know if there is more we can assist you with.

Thanks.