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#define kDefaultCellFont [UIFont fontWithName:@"HoboStd" size:10.0f]

NSString *text = @"This is a simple example of the versatility of blocks, but the standard frameworks are chock-full of other use cases. NSArray lets you sort elements with a block via the sortedArrayUsingComparator: method, and UIView uses a block to define the final state of an animation via the animateWithDuration:animations: method. Blocks are also a powerful tool for concurrent programming."

 NSString *trimmedContent = [text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

constraintSize = CGSizeMake(<WIDTH of Label>, MAXFLOAT);

//You will need to define kDefaultCellFont
CGSize labelSize = [trimmedContent sizeWithFont:kDefaultCellFont
                    constrainedToSize:constraintSize
                        lineBreakMode:NSLineBreakByWordWrapping];


labelSize.height = ceil(labelSize.height)+5;