Docs Install for Chrome

Calculator

Need a quick sum or conversion? Type it and copy the answer.

Do math and unit conversions without a calculator tab. Press ⌘K, type 20% of 4500 or 90 kg in lbs, and press ↵ to copy.

Install for Chrome Try it on this page

7-day free trial No account Chrome, Edge, Brave, Arc, Vivaldi and Opera

Live demo

Get an answer in three steps

  1. ⌘K

    Step 1

    Open the palette

    On any page. Ctrl+K on Windows and Linux.

  2. 20% of 4500

    Step 2

    Type the sum

    The answer shows at the top as you type.

  3. ↵

    Step 3

    Copy the answer

    It goes to your clipboard and the palette closes.

In detail

What the calculator understands

Write it the way you would say it. If TabCmdr can work it out, the answer shows in the Calculator group above everything else.

Percentages the way you say them

20% of 4500 gives 900. 15% on 80 adds 15% to 80 and gives 92, which is handy for tax or a tip. Plain math works too, with + - * /, powers with ^ and brackets.

  • Functions such as sqrt, round, sin and cos: sqrt(144) + 2^5 gives 44.
  • (1200 - 300) / 12 gives 75.
  • Answers are rounded to 12 significant digits, so you don’t get long tails of decimals.

Weights, distances and data sizes

Write the amount and unit, then in, to or as, then the unit you want. 90 kg in lbs gives 198.416035966 lbs and 5 km to miles gives 3.10685596119 miles. Temperatures work too: 100 c to f gives 212 °F.

  • Weights such as kg, g, lb and oz. Distances such as km, m, cm, mi, ft and in.
  • Data sizes count in steps of 1,000, so 2.5 gb in mb gives 2500 mb.
  • Speeds convert as well, such as 60 mph to kph.

px, rem and em for CSS

24px to rem gives 1.5rem and 1.5rem to px gives 24px, using a 16px root size. If your root size is different, add it at the end: 24px to rem at 10 gives 2.4rem.

  • em works the same way as rem.
  • Press ↵ and the value is copied, ready to paste into your stylesheet.

More reasons to do your math here

  • Above your tabs

    The Calculator group sits at the top of the list, so the answer is the row that’s already selected.

  • Enter copies

    A toast shows what you copied, such as Copied 900, so you know it worked.

  • Works offline

    Math and conversions are worked out inside the extension. Nothing you type is sent to a server to be solved.

  • Search when it isn't math

    The web search rows stay under the answer, so you can still look it up on Google, Bing or DuckDuckGo.

  • Times and dates too

    Ask time in tokyo, now + 3 days or unix 1713000000 in the same box.

  • Colors and number bases

    #f0013d to rgb and 255 to binary are answered the same way.

FAQ

Questions about the calculator

More in the documentation.

How do I use a calculator in Chrome without opening a new tab?

Press ⌘K on a Mac or Ctrl+K on Windows and Linux and type the sum, like 20% of 4500. The answer shows at the top of the list. Press Enter to copy it.

How do I convert kg to lbs in Chrome?

Open the palette and type 90 kg in lbs. You can put in, to or as between the two units.

Can it work out percentages?

Yes. 20% of 4500 gives 900, and 15% on 80 adds 15% to 80 and gives 92.

How do I convert px to rem?

Type 24px to rem. TabCmdr uses a 16px root size unless you give your own, as in 24px to rem at 10.

Is a GB 1,000 MB or 1,024 MB?

1,000. 1500 mb to gb gives 1.5 gb and 1 tb to gb gives 1000 gb.

Does the calculator need an internet connection?

No. Everything is worked out inside the extension, so it works offline and what you type stays on your computer.

See all 32 features

One shortcut for your whole browser. Stop hunting for tabs.

Install for Chrome

Free for 7 days Then $3.99 / y No account