# BillingPerUnitTotal

> Billing is currently in Beta and its APIs are experimental and may undergo breaking changes. To mitigate potential disruptions, we recommend [pinning](https://clerk.com/docs/pinning.md?sdk=chrome-extension) your SDK and `clerk-js` package versions.

The `BillingPerUnitTotal` type represents the per-unit cost breakdown in checkout totals.

## Properties

| Property                           | Type                                                                                                                                        | Description                                        |
| ---------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------- |
| <a id="blocksize"></a> `blockSize` | `number`                                                                                                                                    | Number of units represented by one billable block. |
| <a id="name"></a> `name`           | `string`                                                                                                                                    | The unit name, for example `seats`.                |
| <a id="tiers"></a> `tiers`         | <code><a href="https://clerk.com/docs/chrome-extension/reference/types/billing-per-unit-total-tier.md">BillingPerUnitTotalTier</a>[]</code> | Detailed tier breakdown for this unit total.       |

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## Sitemap

[Overview of all docs pages](https://clerk.com/docs/llms.txt)