The Ship by Rate Calculation method will calculate the shipping charge based on the order's total weight, total items purchased or total amount.  This also allows for a base rate charge to be added.

By Weight

When this radio button is selected, your customers' shipping charges will be calculated by the total weight of their purchases. Enter an amount that will be charged per every pound (or kilogram) and enter a base rate that will be charged on every order as well. If you would like, you may also set a minimum charge. 

By Quantity

When this radio button is selected, your customers' shipping charges will be calculated by the total number of products ordered. Enter an amount that will be charged per every unit ordered and enter a base rate that will be charged on every order as well. If you would like, you may also set a minimum charge.

By Order Total

When this radio button is selected, your customers' shipping charges will be calculated by the total monetary amount of the order. Enter an amount that will be charged per every dollar (or whatever currency symbol you are using) and enter a base rate that will be charged on every order as well. If you would like, you may also set a minimum charge.

Shipping Message

Enter a short, descriptive message that will appear next to the shipping charge line item in the shopping cart display. For example, you can enter, "Shipping Charges Automatically Calculated."