Here is Carnival with a slight break down...
What is the tipping policy onboard?
Service Gratuities
For your convenience, we automatically charge the gratuities for dining and stateroom staff to your onboard Sail & Sign account. The total amount is $10.00 per guest, per day (our recommended guideline) as follows:
$ 3.50 Per Day Stateroom Services
$ 5.50 Per Day Dining Room Services
$ 1.00 Per Day Alternative Services: distributed to other kitchen and hotel service staff
For Cruises-To-Nowhere, gratuities of $10 per guest, per day must be prepaid.
Our Staff is totally committed to exceed your expectations in every way possible. If you are not satisfied with the service you receive, we encourage you to contact the Guest Services desk while onboard. This will allow us to address your concerns in a timely and appropriate fashion. At your discretion, you may adjust the gratuities at any time.
For beverage purchases, fifteen percent of the bill is automatically added to the Sail & Sign charge. Room Service staff may be tipped as service is rendered. Tipping your Maître d’ is at your discretion, based upon the service you receive.
NOTE: BARBADOS CRUISES
All gratuities are pre-paid and automatically added during the booking process for Barbados itineraries.
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•Seabourn Cruises - onboard gratuities are neither required nor expected
•Silversea Cruises - onboard gratuities are neither required nor expected