Free Basic Calculator Online – Add, Subtract & Multiply
A simple reliable calculator for everyday arithmetic.
About the Basic Calculator
What is the Basic Calculator?
A basic calculator handles everyday arithmetic — addition, subtraction, multiplication, division and powers — in a single expression.
Why use this calculator?
Simple and fast for shopping maths, budgeting and school work where you just need the right answer without hunting for the right key.
How to use it
- Type the whole expression at once using + − * / ^ and parentheses.
- Press Calculate or just keep typing — results update live.
- Answer respects the standard order of operations.
Formula
Standard operator precedence applies.
Use the scientific calculator page for functions, logs and trigonometry.
Frequently Asked Questions
Can I use decimals?
Yes, decimals work fine, such as 10.50 * 3.
What happens if I type something invalid?
You get a friendly error message instead of a crash, so you can fix the expression.
What order of operations does this use?
It follows standard PEMDAS/BODMAS rules: parentheses, exponents, multiplication and division, then addition and subtraction.
How precise are the answers?
The calculator uses double-precision floating-point math (about 15 significant digits) and rounds the display. For exact symbolic results use dedicated algebra software.
Can I enter negative numbers or decimals?
Yes. Negative values, decimals and very large or small numbers are all supported unless a field says otherwise.
What does it mean if I get an error?
Errors usually mean an invalid input, such as division by zero or a negative value where only positives make sense. Check your entries and try again.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.