Log in to your uCalc account and go to the page with the list of your projects. Open the menu and click on the Get code button. The window with the embed HTML code will appear:
Go to managing your Shopify site. Under the Online Store section (1), choose Pages (2) and click Add page to create a new page (3):
In the Editor, click the Show HTML button (1), paste the calculator code you copied before (2) and click Save (3):
Your calculator is ready!