Calculator
A simple browser-based calculator supporting the four basic operations โ addition, subtraction, multiplication, and division. No installation required โ just open the page and start calculating. It's handy for quick checks like totaling up a shopping cart, verifying a manual calculation, or splitting a bill. Everything you type and every result stays in your browser and is never sent anywhere.
How to use
- Click the on-screen number buttons, or type numbers on your keyboard.
- Choose an operator (+, โ, ร, รท) to build your expression.
- Press = (or the Enter key) to see the result.
- Press C to clear the display and start a new calculation.
How the calculation works
This calculator works the way a typical desk calculator does: it takes two numbers and an operator (+ โ ร รท) and evaluates when you press "=", processing operations in the order you enter them. Entering "2 + 3 ร 4" therefore gives (2 + 3) ร 4 = 20 rather than applying mathematical precedence (which would give 14). That is why results can differ from a scientific calculator or a spreadsheet. Computers store numbers internally as binary floating point, which cannot represent some decimal fractions such as 0.1 exactly. Computed naively, 0.1 + 0.2 comes out as 0.30000000000000004. This calculator rounds each result to 12 significant digits before displaying it, so those tiny errors do not show up in everyday use.
Worked example
Splitting an 8,640 bill between three people 1. Enter "8640" 2. Press "รท" 3. Enter "3" and press "=" 4. The result is 2,880 Each person pays 2,880. If the total were 8,650 instead, 8650 รท 3 = 2883.33โฆ, so someone will need to cover the odd amount.
Things to be aware of
- Operations are evaluated in the order entered. If you need multiplication or division first, work out that part before continuing.
- Results are rounded to 12 significant digits, so this is not suited to very large numbers or calculations needing exact precision.
- History is not saved; reloading the page clears the display.
- Division by zero is undefined and shows an error.
FAQ
Are my calculations saved?
No. Calculation history is cleared when you reload or close the page, so note down any values you need to keep.
Does it work on mobile?
Yes, it works the same way on any device with a browser โ PC, smartphone, or tablet.
Can I use only the keyboard?
Yes โ number keys plus +, โ, *, /, and Enter all work as standard keyboard shortcuts.
Can it do percentages or square roots?
This tool is a simple four-function calculator. For percentage-based math, try the Percent Calculator tool instead.
What happens if I divide by zero?
Since it's mathematically undefined, the calculator shows an error. Enter a non-zero divisor to continue.