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 Weebly site. Choose the place where you’d like to add a calculator and drag the Embed Code widget there:
Click on the widget and choose Edit Custom HTML:
Paste the calculator code you copied before:
Your calculator is ready!