How many stamps would need to be on a huge birthday card?

I bought one of them really large birthday cards at Hallmark this weekend to send to a friend. I think it's almost 18-24 inches tall and atleast 12 inches wide. How many stamps do you think I need on it, or will i have to go ship it by getting it measured and weight? Thanks

How many stamps would need to be on a huge birthday card?
you would have to take it to the post office to get weighed.
Reply:It's no longer just the weight - they have size restrictions now. You should go to the post office, but their website might have some information. A link to the US Postal Service for calculation is below.
Reply:You will have to get it measured at the post office, if you are in the uk the royal mail website has a quotation thing and you can buy the postage online, i am sure the ups has one too. Best not to guess after you have gone to so much trouble.
Reply:30
Reply:It is better if you go have it weighed for accurate postage so you don't waste.
Reply:Go to the post office.