Free Basic Calculator Online

Do quick maths in your browser with our free basic calculator — add, subtract, multiply and divide in seconds, with no signup and no install.

About the Free Basic Calculator

Our free basic calculator is the fastest way to do everyday maths online. Add, subtract, multiply and divide in seconds, with no app to install and no account to create. It works on your phone, tablet or computer, right inside your browser, so it is always ready when you need a quick answer — for homework, shopping totals, splitting a bill, checking a receipt or planning a budget.

Unlike the calculator on your phone, this one needs no download and keeps no history of your numbers. Every calculation happens on your own device, so your figures stay private. The big, clear buttons are easy to tap on mobile, and the result appears instantly as soon as you press equals. You can also use brackets to group parts of a calculation, for example (12 + 8) × 3 = 60. If you need more power, try our scientific calculator for powers, roots and trigonometry, or our percentage calculator for discounts and tax.

How to Use the Basic Calculator

Tap the number and operator buttons to build your calculation, for example 12 + 8 × 3.
Press the equals button to see the result instantly.
Press C to clear everything and start a new calculation, or use the backspace button to fix a mistake.

Frequently Asked Questions

Is the basic calculator really free?

Yes. It is completely free with no signup, no trial and no limits. Use it as often as you like.

Does the calculator work on mobile?

Yes. It works in any modern browser on iPhone, Android, tablets and desktops. There is nothing to install.

Can I do calculations with brackets?

Yes. Use the bracket buttons to group parts of a calculation, for example (12 + 8) × 3 = 60.

Are my numbers sent to a server?

No. Every calculation runs in your own browser. We never see or store the numbers you enter.