**jax555****Charlie**Hi,

Depending on what you are looking for.

In your calculation, this is how it should work:

freight + (subtotal * 8.25%) = total.

Here's a sample form: http://form.jotformpro.com/form/52090720458958?

Here's how my form calculation widget is set:

I also checked your form and it seems to work as expected:

Let us know if the calculation is still incorrect and please provide us more details of it.