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Just pick a number in your head and write it down. You don’t need a calculator. If the waiter is awful, then it’s a pretty easy answer.
 
OR- you could just multiply the total times 0.2, round to the nearest dollar....

Unsurprisingly, there are a LOT of people that can't do that.

Too complicated a “tip”.

Just focus on the bill's dollar amount, ignoring the cents.

For 20%, you then simply double it (i.e., multiply by 2) and drop the final digit.

Easy-peasy.

Want to tip 15% rather than 20%? Just add 1/2 the bill's dollar amount to itself and drop the final digit.

Base 10 is great that way for percentages! No wonder it works as a “percent” relies on it!

Cool Watch tip — although, as others have pointed out, splitting a bill four ways usually burdens (cheats) some diners and unfairly advantages others!
 
When I found out about this a while back, I started using it almost every time I needed to calculate the tip/split amount. Very useful.

Although it's another thing that let's me use my brain less. I wonder how things will go if gen AI really does take off with widely used consumer use cases.
 
When I found out about this a while back, I started using it almost every time I needed to calculate the tip/split amount. Very useful.

Although it's another thing that let's me use my brain less. I wonder how things will go if gen AI really does take off with widely used consumer use cases.
It's already been proven that wild animals use more areas of their brains than humans do. We've turned into a nation of overfed clowns riding in clown cars, eating clown food, watching clown shows. We've become a nation of cringing, craven f***-ups.
 
Or, just tip on how good the service was. I don't need a watch to tell me if the service was good or bad.
 
This article doesn't mention about TIP that isn't always found on the Calculator app outside the United States. The Language & Region of your iPhone has to be set to United States in order for the TIP to appear on Watch Calculator app.
 
Useful article and very easy to calculate the tip amount! Will try it out.
 
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Using this over-simplified method, you are tipping on the State Tax and any "Service fee," not just the actual food bill.
I mean, that would be up to you depending on whether you input the subtotal or the grand total on the bill 🤷‍♂️
 
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What would really be handy would be a phone app with OCR which can read the restaurant receipt, isolate each individual item, and assign it to a person. That way if everyone at the table got a $15 burger except for Chad, who got the $30 steak we can make sure Chad pays is fair share. (I'm sure this exists I'm just too lazy to search the app store).
The Plates app allows you to accomplish exactly that. (Just not using OCR.)
I strongly recommend it.
 
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Using this over-simplified method, you are tipping on the State Tax and any "Service fee," not just the actual food bill.
Every receipt I've received has the total before tax and fees listed also. You can enter the pre-tax total to calculate the tip instead of the grand total..
 
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