# How to solve the issue of "%" on Calculator giving different results on iPhone vs Mac?

To see the result of

``````2000 × 19% / 12
``````

I used both the Mac's Calculator app (with El Capitan or Mavericks), vs on the iPhone with iOS 9.1.

On the Mac, when I press `2000`, `×`, `19`, `%`, it gives me `380`, but when I press the division button `÷`, then it gives `760000` right away, and finishing with pressing `12`, `=` gives `63333.33333333`.

On the iPhone, I do get the expected result: `31.6666`. So how can this be understood and how can it be done on the Mac?

Here's a short article that does a good job of describing the behaviour you're observing with OS X's in-built Calculator app: How does the calculator percent key work?

## What's going on?

When performing an operation involving two values followed by the percent key, the product is first calculated (i.e. `2000 x 19 %` = `380`) and this then replaces the second value in the ongoing calculation, which becomes `2000 x 380`. When you then press the division key `÷` the product of the ongoing operation is calculated (`2000 x 380 = 760,000`), as you described, before you input the divisor to perform another operation.

## Working with percentages using OS X's in-built Calculator

To work with percentages in this instance you should express them in decimal form:

``````2000 × 0.19 ÷ 12
= 31.6666
``````

This works with both iOS's and OS X's Calculator. I would advise against using the percent key in favour of working with decimals. The same can be said when using physical calculators, where the behaviour can differ between models.

• thanks for your answer. I am somewhat stunned to know of "the way to use it on the Mac is not to use it" Nov 9, 2015 at 3:46