# Tech Tip: Using Siri as a Quick Calculator

Sometimes pulling up the calculator on an iPhone just to make a quick calculation can take more time than if you just did the numbers on a piece of paper. You have to find the app, clear any previous results, and then hope you tap the right buttons. It’s even worse on the iPad, since Apple chose not to provide a calculator app with its tablet. That’s no problem, since Siri will be glad to help you with many calculations.

Let’s start by adding up three numbers:

“Siri, what is 123.47 plus 34.993 plus 21.016?”

Subtraction isn’t a problem for Siri, either:

“What is 2,876 minus 423.93?”

Multiplication? Naturally, Siri’s a whiz at that:

“What is 225.44 times 631.53?”

And how about division?

“What is 2,800 divided by 3.14159?”

Siri’s smart enough that it realizes you’re dividing by Pi, so it gives you an approximate answer to go along with that irrational number. Can Siri do everyday calculations? Let’s give it a try:

“What’s the area of a circle that is 5 inches in diameter?”

For that answer, Siri tosses the question over to WolframAlpha, which accurately displays the answer. Let’s get even more crazy:

“What’s the surface area of a sphere with a radius of 25 feet?”

Siri and WolframAlpha make a great team, and I don’t think they were even breathing hard making that calculation. Siri can even do some statistical calculations:

“What’s the average of 123.47 and 34.993 and 21.016?”

Note that since I had a few numbers there, I had to separate them with the word “and”. How about calculating the standard deviation of that small statistical sample?

“What’s the standard deviation of 123.47 and 34.993 and 21.016?”

Cool. Siri can also do square roots and cube roots!

“What’s the square root of 23.448? What’s the cube root of 23.448?”

And if you ask nicely, Siri will square numbers for you as well:

“What is the square of 93.48?”

Siri will also do some fractions for you:

“What is one third of 527?”

By the way, if you happen to have an Apple Watch, it makes an even handier Siri calculator. Just raise your wrist, say “Hey, Siri” and then recite the calculation you’d like Siri to do. Oddly, some of the calculations that are done by WolframAlpha require the Watch to hand off the answer to an iPhone, while others do not.

I’ve just provided a sample of Siri’s fun and useful calculation powers here, and I leave it to the readers to find more ways to use Siri as a calculator. If you come up with something amazing, let us all know about it in the comments section below.

• How do you recall the last calculation Siri made?

• How do I intall this ap to my iPad.?Is it a free service? I need something to help me with calculations

• I need help installing a calculator on mm IPad & Iphone

• Hi, Martha –

A calculator comes pre-installed on the iPhone, but there is not one on the iPad. I suggest PCalc from the App Store, which is a wonderful calculator for the iPad. If you’ve never installed an app on an iPad or an iPhone before, this Apple support web page is very helpful: https://support.apple.com/en-us/HT204266.

Steve

• Thank you for the useful tech tip.