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# Method name: calculatePrice(options: Options, context: Context)

# Method package: wixBookings

# Method menu location: wixBookings --> BookingsCustomPricing --> calculatePrice

# Method Link: https://dev.wix.com/docs/velo/events-service-plugins/bookings/service-plugins-spis/bookings-custom-pricing/calculate-price.md

# Method Description:

Calculates the price of a booking to include during checkout. The calculated price is based on custom business logic.

The `calculatePrice()` function calculates custom pricing for use on the checkout pages of a merchant's site.
The function is automatically called by Wix when the booking is being checked out for payment.

### Where to find `calculatePrice()`
When you [add the Custom Pricing plugin](https://dev.wix.com/docs/develop-websites/articles/code-tutorials/wix-bookings/tutorial-bookings-pricing-custom-extension.md#step-1-create-a-bookings-pricing-extension), 
a folder is automatically added to your site. Use the `.js` file in the folder to write the code to calculate the price for the booking. 

For more information on customizing your price calculation, see [Tutorial: Bookings Pricing Custom Extension](https://dev.wix.com/docs/develop-websites/articles/code-tutorials/wix-bookings/tutorial-bookings-pricing-custom-extension.md#js).



# Method Code Examples:

*** Note: do not assume any prop names or enum values other than the ones in the example.

## Calculate a custom price for a booking

```javascript
// Import "coded-elsewhere" functionality for retrieving special rates
import { getPrices } from 'backend/queries';

// The calculatePrice service plugin runs at checkout to calculate the final price
export const calculatePrice = async (options) => {
  const prices = getPrices();

  const additionalFields = options.booking.additionalFields;
  const numberOfParticipants = options.booking.numberOfParticipants;
  const weekendRate = getFieldValue(additionalFields, "weekendRate");
  const addon1Value = getFieldValue(additionalFields, "Addon 1");
  const addon2Value = getFieldValue(additionalFields, "Addon 2");
  const addon3Value = getFieldValue(additionalFields, "Addon 3");
  const rate = weekendRate == "true" ? prices.weekend : prices.weekday;

  const finalPrice = numberOfParticipants * rate +
    addon1Value * prices.addon1 +
    addon2Value * prices.addon2 +
    addon3Value * prices.addon3
  ;

    return {calculatedPrice: finalPrice};
};

// Retrieve the charge for each given `additionalField` for the booking.
export function getFieldValue(additionalFields, text) {
  const foundFieldArray = additionalFields.filter(additionalField => additionalField.label === text);
  return foundFieldArray.length === 0 ? undefined : foundFieldArray[0].value;
}
```

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