# Understanding your cluster usage costs

#### How billing works

Usage is tracked and billed per project. Costs are aggregated quarterly in an invoice, based on CPU/GPU hours, GB hours, storage, etc.

<span style="color: rgb(43, 48, 59);">You can </span>view real-time and daily/weekly/monthly consumption on the [billing dashboard](https://apex.unil.ch/ords/f?p=MYDCSR) (VPN connexion is required).

Only the PI of the project can view its billing page. Other project members should contact their PI for usage/cost details.

If unexpected charges are noticed, contact <helpdesk@unil.ch>, specifiying "DCSR" in the subject, before the end of the billing cycle (every quarter).