Petrolog4 licences can be purchased for a minimum of 1 year.
A single licence can include several installations (licence allocations). The cost of a licence is determined by the number of years it covers and the number of installations it includes.
One installation for one year costs AU$100 in 2025. Purchases of over 30 installations include a 10% discount.

Each Petrolog4 installation is linked to the computer the software is installed on, and the user who installed the software on that computer. More details are provided on https://norsci.com/?p=user-licences.

When a large number of users is expected within an institution, a site licence can be obtained which allows for an unlimited number of Petrolog4 installations on computers that access internet on campus. The full site licence costs AU$10,000 per year in 2025. Institutions that use Petrolog4 for teaching purposes are offered a discounted site licence at AU$7,500 per year.

If you would like to obtain a teaching licence for Petrolog4, please contact us on enquiry@petrologsoftware.com to discuss the most suitable licence arrangements for your purposes.

To purchase a licence, visit norsci.com

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If you would like to generate an invoice, rather than pay using a credit card, then:
1) fill in Customer Information and Purchase Details on https://norsci.com/?p=petrolog-purchase;
2) click the 'Buy Now' button at the bottom of the page;
3) on the new page that appears, click 'Download as PDF' link at the top left corner (below 'Order Summary');
4) save the invoice; and
5) close the browser page.
The downloaded invoice will contain all details necessary for payment.