> For the complete documentation index, see [llms.txt](https://simpaypl.gitbook.io/simpay-laravel/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://simpaypl.gitbook.io/simpay-laravel/direct-billing/calculate-amount.md).

# Calculate amount

```php
SimPay::directBilling()->calculate(amount: 15.00);
```

Response will be [AmountCalculatorResponse](/simpay-laravel/direct-billing/responses/amountcalculatorresponse.md)<br>