Use Siri as a Calculator

Nov 25, 2012 - 10 Comments

Siri as a calculator

Don’t want to unlock your iPhone and launch the Calculator app? Bummed that iPad doesn’t even have a default Calculator? No big deal, because Siri can function as a regular old calculator, and it has the obvious added bonus of being handsfree. To have Siri calculate equations for you, just feed Siri numbers and thanks to the Wolfram Alpha backend Siri will quickly spit out the answer, complete with a number line.

The simplest forms of Siri calculation can be used as follows:

  • Number + number
  • Number / number
  • Number X number
  • Number – number

Try it out by saying the equation aloud to Siri just as it reads. You’ll find the results vary a bit based on the equation given:

Addition and subtraction, Siri will return an easy to follow number line showing movements to the sum.

Multiplication of large numbers, Siri returns the answer in addition to a number line that shows any potential exponents.

Division, Siri provides the answer, reduces the fraction, gives the number as a decimal, and even shows a mixed fraction.

You can string a variety of numbers together and make fairly complex equations, which Siri typically gets right. You’ll notice on some particularly complicated equations that Siri won’t necessarily obey the proper order of operations, so you may want to avoid using Siri as a calculator for complex algebra and calculus homework.

We covered a similarly themed tip recently discussing how Siri can function as a tip calculator, but with how useful the general calculation functions are it’s well worth mentioning the wider potential uses here.

This tip comes to us from Jason R. who uses Siri to add up receipts for expense reports, thanks for the idea J!


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Posted by: Paul Horowitz in iPad, iPhone, Tips & Tricks


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  1. Robest says:

    Very helpful tools and techniques

  2. Jee says:

    Some fraction equations are complicate and difficult to solve. Doing it manually may take a little longer. But to check if the result of computation is very critical. So I used some apps to check the solution. One of my favorite app is fraction calc from This apps helps me a lot.

  3. Aurora Green says:

    I think Siri should have an estimation skill because sum people have sum tubel like me. I think this should be a new feature in a new update.

  4. Mark sodoma says:

    If i ask SIRI to add more than 100 different numbers (5+6+3+444+72+etc…) she will interrupt before i give the full equation. Is there an app that will allow more than 100 numbers to be added without interrupting at number 76 or 83 to say, “Sorry…”…and then i have to start all over again. Sometimes it works. And for adding 5 numbers as shown above, it works fine. But for a long list of numbers to add, what do you suggest? Is there an app? Because Google voice has the same problem.

  5. Jacob says:

    It turns out that for huge numbers Siri is better than the calculator app. For example, ask her what 1000^1000 is, and she’ll return an answer: 1*10^3000 (which means a number with 3001 digits). But it only gets better. She can handle factorials of “massive” numbers (such as 1000000 which gives a 5.5+ MILLION digit number), but I think the only reason she can handle these ridiculous numbers is because of the fact that she uses Wolfram Alpha. I’ve tried these equations in the online Wolfram Alpha site, and they worked exactly as what Siri did.

  6. Damian says:

    I agree with you in that one should avoid using Siri as a calculator for complex algebra and calculus homework. The lack of proper use of order of operations is a bit annoying because it can give you a completely different answer. Imagine if you are doing a sale and you charge your customer the wrong number. In the absence of a regular calculator, I would recommend using the Google Calculator instead. Have you tried using Google Voice for calculations?

  7. Fibonacci says:

    I recently discovered popcalc which is a very intuitive and easy free calculator for both iphone and ipad.
    Definitely my default calculator now.

  8. Cristian says:

    This nice trick does not work on Spanish. (Haven’t tried other languages though)

  9. Reagent X says:

    Siri can handle really completed equations also. Not just adding and subtracting. It’s been like that since the release of the 4S, don’t know why you think this is news

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