I am creating cleaning pricing calculator based on type of clean and frequency by square footage. It would be great to have an add-on service selection calculation as well.
Hi there, @Kristie and welcome to the Community 
You can add a field for the Add-on selection (usually Dropdown or Choice) and it to your calculation.
If you’re facing difficulties with it, please describe your use case in more detail. We’ll be happy to help 
That’s awesome to know! I just started yesterday, so it’s all new! I will try adding it.. (just don’t want to mess up what I’ve already done ) thank you!
Wow, that’s great to hear you’ve started exploring the Calculator!
Just in case, here are some articles that will help you get the most out of it:
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Getting Started with Calculator Widget - Elfsight Help Center
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Working with Formulas in Calculator widget - Elfsight Help Center
And if any questions come up, don’t hesitate to ask them here. We’ll be delighted to advise