iOS 11 Bug: Typing 1+2+3 Quickly in the Calculator App Won't Get You 6

calculatorappA bug in the built-in Calculator app in iOS 11 is getting some major attention this week, despite the fact that it's been around since iOS 11 was in beta testing.

At issue is a calculator animation that causes some symbols to be ignored when calculations are entered in rapid succession. You can try it for yourself: Type 1+2+3 and then the equals sign into the Calculator app quickly.

Due to animation lag introduced when adding two or more numbers together, your result is more likely to be 24 than 6.

The same goes for many other calculations -- the Calculator ignores some inputs unless you're entering numbers slowly enough to account for the light-up button animations that highlight the keys that are being pressed. Symbols do not register when tapped while a number button is still highlighted, resulting in incorrect calculations if you're inputting numbers quickly. Reddit user cplr describes the problem:

Any iOS developers will see what is wrong here: the bug is that the animation that lights up the button is blocking touch events until the animation completes. This is the default behavior for animations, but to make an app feel responsive it's best to find a way around that (it can be a one line fix, but sometimes it is complicated).

There are hundreds of complaints about the problem on reddit this week, but it's an issue that's been discussed on the MacRumors forums since the iOS 11 beta testing period. Throughout the beta testing process, the animation lag was not addressed, nor has it been fixed in any of the iOS 11 updates released so far. It's also still present in iOS 11.1.

Some users have experienced similar issues when using older versions of iOS, but the animation lag is noticeable enough in iOS 11 to make the Calculator nearly unusable when attempting to make rapid calculations.

Apple seem to be aware of the issue, because as The Loop points out, Apple employee Chris Espinoza says more than 70 people have filed a Radar report on the bug, alerting Apple to the problem. With it receiving so much attention, we could potentially see a Calculator fix in the next iOS 11 update.


In the meantime, iOS users who need a reliable alternative can use third-party apps like Calcbot and PCalc.

Related Forum: iOS 11

Top Rated Comments

desmond2046 Avatar
67 months ago
A calculator app is supposed to be a high school level project. Yet apple cannot get it right. This is extremely embarrassing.
Score: 97 Votes (Like | Disagree)
eyeseeyou Avatar
67 months ago
This is the calculator that provided the data that said the notch was a good idea.
Score: 55 Votes (Like | Disagree)
senzung Avatar
67 months ago
1+2+3 = 23, Courage!
Score: 46 Votes (Like | Disagree)
840quadra Avatar
67 months ago
Odd, animation for the + button slows down the actual input of addition. You have to wait for + animation to complete for it to take the rushed 2nd addition.

You would figure That turning on “reduce motion” would help a little, but no.

Maybe I can have my boss calculate my raise before this is fixed!!
Score: 40 Votes (Like | Disagree)
eoblaed Avatar
67 months ago
The calculator must be using that New Math we keep hearing about.
Score: 30 Votes (Like | Disagree)
Oblivious.Robot Avatar
67 months ago
Wait.. does that mean 1+2+3 is not 24?
WHAT! :eek:
Score: 28 Votes (Like | Disagree)

Popular Stories

iphone 14 pro hands snowflakes 1

Best Black Friday iPhone Deals Still Available

Wednesday November 23, 2022 1:55 pm PST by
Cellular carriers have always offered big savings on the newest iPhone models during the holidays, and Black Friday 2022 is no different. Right now we're tracking notable offers on the iPhone 14 and iPhone 14 Pro devices from AT&T, Verizon, and T-Mobile. For even more savings, keep an eye on older models like the iPhone 13. Note: MacRumors is an affiliate partner with some of these vendors....
apple watch gold ornaments

Best Black Friday Apple Watch Deals Still Available

Wednesday November 23, 2022 9:31 am PST by
We're tracking all of the best Apple product discounts for Black Friday this week, and the Apple Watch always makes a great gift around the holiday season, so you're guaranteed to find solid discounts right now. In this article, you'll discover the best Black Friday sales on Apple Watch Series 8, Apple Watch SE, and Apple Watch Ultra. Note: MacRumors is an affiliate partner with some of these...
new airpods lineup black friday

Best Black Friday AirPods Deals Still Available

Tuesday November 22, 2022 10:01 am PST by
Although we've been tracking Black Friday deals for a few weeks now, the shopping holiday is officially kicking off this week and we're highlighting the best sales for each of Apple's product lines. In this article, you'll find the best Black Friday sales on AirPods 2, AirPods 3, AirPods Pro, AirPods Pro 2, and AirPods Max. Note: MacRumors is an affiliate partner with some of these vendors....
ipad holiday bulbs

Best Black Friday iPad Deals Still Available

Thursday November 24, 2022 12:25 pm PST by
Black Friday deals have been in full swing for the better part of a month, and now that the shopping holiday is officially here we're seeing even more solid discounts on Apple devices. We're highlighting the best sales for all of Apple's product lines, and in this article you'll find the best Black Friday sales on iPad, iPad Pro, iPad Air, and iPad mini. Note: MacRumors is an affiliate partner ...
mac imac snowflakes

Best Black Friday iMac and MacBook Deals Still Available

Thursday November 24, 2022 1:07 pm PST by
Our Black Friday coverage continues today with the best deals you can find on MacBook Pro, MacBook Air, and iMac. As with all Black Friday deals, we aren't sure how long any of these will last, and prices are always fluctuating, so if you see something you want, be sure to buy it soon. Note: MacRumors is an affiliate partner with some of these vendors. When you click a link and make a...
General Black Friday Deals 2022 Green

All the Apple Black Friday Deals You Can Still Get

Friday November 25, 2022 4:40 am PST by
Black Friday is winding down for 2022, but many Apple products are still seeing major discounts. In this article, you'll find every Apple device with a notable Black Friday sale. We'll be updating as prices change and new deals arrive, so be sure to keep an eye out if you don't see the sale you're looking for yet. Note: MacRumors is an affiliate partner with some of these vendors. When you...
General Black Friday Deals 2022 Blue

All the Apple Black Friday Deals You Can Get Right Now: AirPods, Apple TV, Mac, iPad, and More

Saturday November 19, 2022 8:00 am PST by
Last week was jam-packed with early Black Friday deals, and now that the shopping holiday is right around the corner, we're going back through all of the best sales you might have missed over the past week and updating as prices change and new deals arrive. As with all holiday shopping, there's no guarantee that better prices won't come around later in the season, but if you want to shop early,...
Best Buy November Deals Hero

Best Buy Reveals Black Friday Plans With Sitewide Sales Available Now

Tuesday November 22, 2022 3:49 pm PST by
Following in the footsteps of Target and Walmart, Best Buy this week detailed its plans for the Black Friday shopping holiday and its schedule looks a lot like other retailers. In terms of sales, Best Buy has the expected list of TVs, appliances, video games, computers, streaming devices, and more. Note: MacRumors is an affiliate partner with Best Buy. When you click a link and make a...