This calculator is built to be multi-functional. It does not require text in all the fields to work
For example, You can enter only the [billing cycle], and [data amount] to calculate the proration.

This website works perfectly in split screen view.

This calculator always assumes that plan or data changes are made today.

Make sure to use tax in decimal form. EX: 5% tax should be written as: 0.05

Make sure the Billing Cycle entered matches what is shown in SmartDesktop on the top right.

When calculating plan costs, dont forget to include the plan + data + addon costs.

New: SMS Results feature: Send customers a text containing all the proration details they need.
First click the "Send Text To Customer" Button, enter the customers phone number, and then click the "Copy" button.

Nandini
For reporting invalid calculations when billing date is lower than todays date.
Shannon
For reporting incorrect next invoice estimates.