Calculations (PRO)

The Calculation field shows a number worked out from the other answers, live, as the visitor fills in the form: an order total, a quote, an estimate. It needs the PRO key.

Add a calculation

Drag Calculation from the field types onto the canvas.
In Formula, write the calculation. The field names under the box insert themselves when clicked.
Check the line under the box. Formula OK means it works.
Set how the result looks:
- Before — text before the number, such as $
- After — text after it, such as USD
- Decimals — 0 to 4

Writing a formula

Refer to a field by its field name in curly brackets:

{product} * {qty} + {delivery}

You can use numbers, brackets, and:

You write	It does
`+ - * /`	add, subtract, multiply, divide
`%`	the remainder of a division, not a percentage: for 20% write `{price} * 0.2`
`min(a, b)` `max(a, b)`	the smaller or the larger value
`round(x, 2)`	round to 2 decimals
`ceil(x)` `floor(x)`	round up or down to a whole number
`abs(x)`	the value without its sign

A formula can be up to 500 characters long. Dividing by zero gives 0.

Prices on choices

Give an option a number after a vertical bar, in Options (one per line):

Pickup | 0
Courier | 15
Post | 8

Visitors see Pickup, Courier and Post. The formula counts 0, 15 or 8.

A dropdown or radio buttons count the chosen option’s number
Checkboxes add up the ticked ones
An agreement checkbox counts as 1 when ticked and 0 when not

What is stored

The result is worked out again on the server when the form is sent. The stored number is the server’s, not what the browser sent, so nobody can change a total by editing the page. The total on screen always equals the stored one.

Using a result

Show a field only for some totals, with a condition on the Calculation field
Route large orders to someone else
Read it in notifications, webhooks and Google Sheets, like any other answer

Calculations give a price, but they do not take a payment: Forms RB has no payment fields yet.

Documentation