Google knows how much to tip (and can split the check too.)

Have a dinner check that you're going to split evenly amongst the diners and also want to know how much to tip? Just search Google for tip for $92.37 (change the amount as appropriate) and search. You'll be presented with an interactive result telling you how much to tip @ 15% and what the total will then be. If you wish to tip more (or less) or have more diners with which to evenly split the check, just adjust those fields accordingly.