Posted by on 2/21/08

iPhone Calculator

The iPhone calculator is a simple calculator with minimal functions.
iPhone Calculator
To do a simple calculation, enter in a number, then an operation, then another number, and then the = button. For instance, to add 13+86 you would enter 1 then 3, then +, then 8 and 6, then =.

To calculate a restaurant tip, you would enter the total bill, then X for multiplication, then . and 2 to find 20% of the bill. Then press = to get the result.

There is also a memory function. Press m+ to store the current number in memory. Once it is there, you can use m+ to add to that number. Use m- to subtract from memory. When you want to get the result that is in memory, use mr/mc. Press it again to clear memory. When a number is stored in memory, the mr/mc button is outlined.
The c button will clear the current operation.

The calculator will perform operations in standard mathematical order. So 3+4×2 will return 11. This is because multiplication and division are performed before addition and subtraction. To do the equivalent of 3+4 multiplied by 2, you would type 3+4=x2=.
Note that dividing by 0 does not return an error in the iPhone calculator. It returns 0.
Pressing the = button will repeat the last operation. So 3+4×2 will return 11. Press = again and you get 22, then 44, then 88, and so on.
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8 Responses to “iPhone Calculator”

  1. Greg says:
    9/22/08 at 2:58 am

    If you turn the phone on it’s side while in Calculator – viola! A full scientific calculator appears – it’s not so basic after all…

    Enjoy!

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  2. rosenz says:
    9/22/08 at 6:23 am

    Greg: Yes, you’re right. That was added after this blog post was originally published. Thanks!

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  3. barb says:
    10/23/08 at 9:25 pm

    what software version is this? My calc is the same whether its turned on its side or not

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  4. rosenz says:
    10/23/08 at 9:31 pm

    barb: I’m using 2.1. Can’t remember whether it is in 2.0 or not. I know it isn’t in 1.X.

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  5. Paul says:
    6/28/10 at 10:03 am

    How to use the M+, M-, MR, MC buttons?

    Example 2×3+3×3+4×3+5×3=?

    Reply To This Comment
    • Gary Rosenzweig says:
      6/28/10 at 10:28 am

      They work the same as they do on any calculator. M+ adds to the number in memory, M- subtracts from it, MR recalls memory and MC clears it.
      So you could do MC to clear. Then 2 x 3 = M+ to put 6 into memory. Then 3 x 3 = M+ to add 9 to it for 15. Then 5 x 3 = M+ to add another 15 to memory. Pressing MR would then give you 30.

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  6. Judy R. says:
    10/11/10 at 1:16 pm

    Why, oh why, isn’t there a clear error button on calculator. Or is there a simple way to do this?

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