Here's a great little...ahem...tip from OS X Daily. Instead of relying upon a tip calculator app, why not put the iOS invisible lady in charge inside your iPhone to good use when looking to tip at a restaurant...
OS X Daily notes Siri herself isn't designed to figure out tipping amounts right off the bat. You'll need to ask her in a specific way, posing the query as a math equation:
What is (tip percentage) of (total bill)? What is 20% of $34.52?You can also give Siri the literal math and get the same response, providing an equation like "15% times 60″. Either way, Siri will report back with the proper math and you'll find the tip under "Result".
Of course, where Siri falls short compared to a dedicated tipping app (I personally like Tip'n'Go Tip Calculator for iOS and Tip Me for Android) is the ability to preview differing tip rates all at once or the option to calculate splitting the bill amongst friends. But in a pinch while dining alone or handling the bill all yourself, Siri's math skills can come in handy!

Shaw's Original Fir...
Great idea except most people try to refrain from using their phones in restaurants - an excellent idea. God help us if we can't do mental math to calculate a tip. I'm guessing using your phone to ask Siri the tip would be like advertising to the nearby tables that you're are too lame-brained to do the math and perhaps that you are too cheap to leave a reasonable percentage tip.
Yeah, I gotta say this post is pretty lame.. Siri doesn't directly help with tipping, it just answers math questions... at least tipping programs also usually help you split the bill.
Here's an idea - in a pinch, take the pen they give you to sign the check with and a napkin and do the math yourself. We're talking 4th or 5th grade math here, people...
Or use the built in calculator... can't imagine talking to Siri in a restaurant.
I love you all and I'm glad that this hasn't degenerated into a tip/no tip argument because I'm right about that one and cannot deal with insubordination!!!
No, really it's totally easy to do a tip in your head. I wouldn't have believed it either but it really is. Just move the dingdang decimal over and double it!
Like this:
Your bill is $125.26:
Round up to $130. You are a human and they are not getting minimum wage. Move the decimal over one to the left. 13!
You tip:13 x 2: 26
$26 Done.
You are so much smarter than you ever knew.
@leigh - what if I want to tip 25%?? :)
Seriously?
10% x 2, or 10% plus 5%.
Don't they teach basic arithmetic in school anymore? Writing, by which I mean using a pencil to make letters on a page? gone. Art? gone. Music? gone. Critical thinking? gone.
Now it's math.
WTF are we paying taxes for? Oh, right, national defense of 311,591,917 uneducated pie holes. Who would want to invade and feed us???