What you didn’t know your Windows Calculator could do

We all know Windows Calculator can add, subtract, multiply and divide.

A few of us probably know it works as a scientific calculator too (although I personally have no idea what a cosine is nor how I would use one).

Programmers might even know about the functions that manipulate decimal, hexadecimal and binary numbers in a funky way.

But it also has a bunch of features that are genuinely useful to normal businessfolk like you and I. And I bet you didn’t knew they were there.

Here’s what it can do:

Date calculations

If you select two dates, Windows Calculator will tell you the time between them in years, months and days or in days.

Your life starts to seem very long when it’s expressed in tens of thousands of days.

Windows Calculator's date calculation
Currency converter

Windows Calculator also has a really simple currency calculator, something we all need even if it’s only to work out how expensive a pint of lager is on the beaches of the Mediterranean.


Currency function
Volume converter

Windows Calculator converts between twenty different units of volume including litres, pints, gallons (UK and US), pints (UK and US), all degrees of litres, cubic inches (American engines) and cooking measurements like teaspoons, tablespoons and fluid ounces.


Windows Calculator's volume function
Length converter

Windows Calculator converts between 11 units of length from a micron to a nautical mile. In case you’re wondering, a nautical mile is 1,852,000,000 microns.

Turf fans may be disappointed not to see furlongs in there.

Apart from that, it’s got the whole nine yards (or 8.3 metres).


Length function
Weight converter

Calculator converts between 14 units of mass including numerous of levels of grams, UK and US tons, pounds and stones for when we’re comparing our weight with our cousins across the pond. That’s certainly more encouraging than expressing your weight as a proportion of an elephant. Not sure when you’ll need that.

It even has carats in case you want to weigh the diamonds you always find down the back of the sofa.



Windows Calculator's mass function

You probably don’t want to admit to knowing how to convert Celsius in Fahrenheit, but Windows Calculator helps those of us who genuinely don’t know how to do it.

And it throws in Kelvins too in case you need to measure the temperature of the other half’s stare after you ‘forget’ to wash up.


Temperature function

Windows Calculator converts 7 units of energy including the venerable British Thermal Units (BTUs), thermal and food calories and joules (just so you know how far you’ve got to push the treadmill to work off that Mars bar).


Windows Calculator's energy function

With Windows Calculator, you can convert between metric areas from millimetres to kilometres and imperial areas from inches to miles.

Acres and hectares are thrown in too so you can work out how many cows can graze in your back garden.

Area function

You can convert between 7 units of measurement from centimetres per second through knots to Mach.

Even Usian Bolt seems sluggish when you clock him in Mach.

Windows Calculator's speed function

Windows Calculator can convert from microseconds to years with six increments in between.

If that’s not a perfect tool to occupy annoying young relatives on a rainy afternoon, I don’t know what is.

Time function

Windows Calculator may have missed a trick in its power conversions. It converts from Watts to 4 other units of measurements but the most common power-related conversions involve the relationship between watts, volts and amps.

If they did a conversion like Rapidtables it would be more useful.

Windows Calculator's power function

Windows Calculator intriduces us to units of data few of us knew existed. There’s data beyond the petabyte.

Who knew a yottabyte wasn’t a sea-faring equivalent of a gigabyte?

Data function

There are six measures of pressure. Metric and imperial units are included.

The intensity of your boss’ interrogation during an annual performance review is not included.

Windows Calculator's pressure function

Angle almost seems like a poor relation, with Windows Calculator only supporting 3 units of measurement.

These include gradians which are not, as it happens, monochrome versions of radians. Pity.

Angle function

Yes, it’s true that there are other tools that do this too. Google Converter for one. But Windows Calculator is always easy to find whereas Google Converter doesn’t even rank in a Google Search until you remember it’s called Google Unit Converter.