Basic Calculator Online

Free math calculator — keys or keyboard.

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Recent calculations

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Calculations never leave your browser

Use this free basic calculator online to add, subtract, multiply, and divide. Results appear instantly with a short history. For sin, cos, log, and powers use the advanced calculator or visit the calculator homepage.

How to Use the Free Online Calculator

1

Enter a number

Tap the keypad or type digits on your keyboard. Decimals and negatives are supported.

2

Choose an operation

Select +, −, ×, or ÷, then enter the next number for multi-step math.

3

Get the result

Press = (or Enter). Copy the result, clear history, or keep calculating.

Frequently Asked Questions

Is this basic calculator free to use?

Yes. The Site95 basic calculator is 100% free with no signup, no limits, and no watermarks.

Does my data leave my device?

No. All calculations run in your browser with JavaScript. We never receive your numbers or results.

Can I use my keyboard?

Yes. Type digits, +, -, *, /, Enter for equals, Escape or C to clear, and Backspace to delete.

What operations are supported?

Addition, subtraction, multiplication, division, percent, plus/minus toggle, and decimal numbers.

Can I copy the result?

Yes. Use the Copy result button to place the current display value on your clipboard.

Does it work offline after loading?

Once the page and scripts have loaded, calculations run locally. An internet connection is only needed to open the page initially.

Where is the advanced / scientific calculator?

Open the free advanced calculator on Site95 for sin, cos, tan, log, powers, roots, factorial, DEG/RAD mode, and memory — still private in your browser.

Free Basic Calculator for Everyday Math

Whether you need a quick total, a division for splitting costs, or simple product math, a reliable online calculator is handy on any device. Site95's basic calculator supports addition, subtraction, multiplication, division, percent, sign toggle, decimals, a short history of recent results, and a maximize mode for larger screens.

Private by design

Unlike apps that require installs or accounts, this tool runs entirely in your browser. Numbers and results stay on your device. Use it on desktop or mobile whenever you need fast, private arithmetic — completely free.

Common uses

  • Students checking homework arithmetic
  • Shoppers totaling prices and discounts
  • Freelancers estimating simple billable amounts
  • Travelers converting rough totals without a separate app

Keyboard shortcuts

Digits 0–9, operators + - * /, Enter or = for equals, Escape or C to clear, Backspace to delete, and % for percent. Press F to toggle large (maximize) view when available.

Need scientific functions? Try the free advanced calculator (trig, logs, powers). Need km to miles or °C to °F? Open the unit converter. Looking for more free tools? Visit our PDF tools, image tools, and word counter on Site95.