A shipping rates calculator on your cart page that lets customers estimate their shipping costs before they proceed to the checkout page.
Open Shipping rates calculator settings.
1.
From your Shopify admin, go to Online Store > Themes.
2.
Find the theme that you want to edit and click Customize.
3.
In the left-hand toolbar, click Theme settings.
4.
Click Shipping rates calculator.
GENERAL SETTINGS
Show the shipping calculator: set Yes to display the shipping rates calculator on your cart page, or No to hide it.
Heading text: enter the text that will be displayed above your shipping rates calculator.
Default country selection: choose which country will be selected by default.
Note: If your customer is logged-in, the country in his default shipping address will be selected. If you are not sure about the spelling to use here, refer to the first checkout page.
Submit button label: enter the text that will be shown on the submit button.
Submit button label when calculating: enter the text that will be shown when the shipping price is being calculated.
ERROR MESSAGES
General: enter the messages you want to show in error messages. Note: Use the "messages" variable to display dynamic messages.
Country is not supported: enter the message you want to show if your customers' country is not supported.