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Calculator Builder
Formula fields that update live as the visitor types.
What it does
Calculator Builder evaluates a safe formula from named inputs. Results update as values change. No eval() — the formula evaluator is allow-listed.
Live demo
Change price, quantity, or discount. Subtotal, savings, and total update immediately. Unknown tokens are refused.
Get an instant estimate
Change the unit price.
Subtotal
$490.00
You save
$0.00
Total
$490.00
How to implement
- Enable Interactive Calculator Builder.
- Add inputs and a result field with a formula such as qty * price.
- Style the result on the Style tab.