You can add your ShareGrid rentals to any calendar software with iCalendar support, like Google Calendar.

To subscribe to the calendar:

1) Go to your account settings and open the link under "Subscribe to Rental Calendar"

2) If you have iCalendar software installed, click Subscribe to Calendar to open your calendar software, or copy your iCalendar link to add it manually.

To add ShareGrid to Google Calendar:

1) Open Google Calendar.

2) On the left side, find "Other calendars" and click the down arrow.
Click Add by URL.

3) Enter the calendar's address in the field provided. 

4) Click Add calendar. The calendar will appear on the left side under "Other calendars."

Note: It might take up to 12 hours for changes to show in your Google Calendar.

Different calendar software may update at different intervals.