When to use this
- You need a quick everyday calculation and the task does not require a specialized date, unit, or fraction workflow.
- You want a visible expression, reusable answer, or percentage check before moving to a narrower calculator.
Basic Calculator
A fast online calculator for everyday math. No sign-up required. It stays easy to tap on mobile and keeps history on your device.
0
Formula / focus
Use it for quick totals, rounding checks, tax-adjacent arithmetic, and follow-up math that starts from the last result.
Four-function math Percent Ans recall History Keyboard support
Decision Check Before Calculating
How it differs from nearby calculators
Use focused calculators when the question has a named shape such as discount, age, working hours, or date difference. Use this page when the formula is still open-ended.
Common input mistakes
- Treating a percent result as a final price without checking add/subtract direction.
- Using the generic calculator when the task has dedicated result labels elsewhere.
How to read the result
- Read the displayed operation first, then the number.
- If the label is not the value you intended to compare, switch to the focused calculator below.
Next action
- Open the closest focused page if the wording matches one.
- Use the guide links when the mistake is about choosing the formula, not pressing buttons.
Related calculators
Examples, usage, and FAQ
Use this section before calculating to confirm whether this is the right calculator, how to enter the values, and what a result can and cannot tell you.
Overview
Use this calculator for everyday arithmetic that should feel instant.
Large keys, Ans recall, history, and readable display options keep it practical on phones.
How To Use It
- Enter numbers and operators.
- Use Ans, %, +/-, or backspace when needed.
- Press = to calculate, then reuse a recent result from history if you need another step.
FAQ
Q. Where is my data stored?
History and display preferences stay in your browser localStorage and are never sent to our servers.
Q. Is it mobile-friendly?
Yes. The keypad prioritizes large touch targets and a compact first screen.
Q. When should I use the scientific calculator instead?
Use the scientific version when you need powers, roots, trig, or logarithms.
Example Inputs
78 ร 14
78 ร 14
A simple shopping or estimate example.
15% of 240
240 ร 15%
Useful for tips, tax, or discounts.
Ans + 18
Ans + 18
Continue from the latest answer.
Keyboard Shortcuts
0-9
Number input
. ,
Decimal input
+ - * / %
Operators
Enter / =
Evaluate
Backspace / Escape
Delete / clear all
A / N
Ans / toggle sign
Read the calculator guide
See when to switch calculators, what the scientific calculator does well, and how symbol input works before the next calculation blocks on setup.
Order of operations basics
A beginner guide to order of operations covering 2 + 3 ร 4, why it becomes 14 instead of 20, and how parentheses remove guesswork.
Common percentage mistakes for beginners
A beginner guide to percentage mistakes, including the difference between 10% off and a 10% markup, plus confusion around base value, rate, and percent-of questions.
Choose the right calculator
A practical guide to choosing between the basic calculator, scientific calculator, percentage tools, fractions, unit conversion, date difference, working hours, and age-on-date tools.
When scientific calculators help most
See when a scientific calculator is the right choice, what kinds of expressions it handles well, and how it differs from a basic calculator.
Math symbol input basics
Learn which math symbols are available directly in the site and which ones you may need to find through your OS or IME.