Basic Calculator Online

Free online basic calculator with addition, subtraction, multiplication, division, percent, memory and keyboard support. Fast, accurate, and mobile-friendly.

How to Use the Basic Calculator

Enter a number using the on-screen keypad or your physical keyboard.
Press an operator button: + for add, − for subtract, × for multiply, or ÷ for divide.
Enter the second number.
Press = to see the result. Chain more operators to keep calculating.

使用场景

•Quick everyday arithmetic — tips, splits, totals.
•Homework and study aid for school math.
•Shopping and budget calculations with the percent key.

公式

Supports four basic operations: addition, subtraction, multiplication, and division. Includes percent, sign toggle, and memory functions.

常见问题

How do I use the percent button?

Press a number, then an operator (+, −, ×, ÷), another number, and then %. For addition and subtraction the calculator computes a percentage of the first operand; for multiplication and division it divides the current value by 100.

What do M+, M−, MR, and MC do?

M+ adds the current display to memory, M− subtracts it, MR recalls the stored value, and MC clears memory. Memory persists until you press MC or reload the page.

Can I use my keyboard?

Yes. Digits 0–9, the period, plus, minus, star (×), slash (÷), Enter (=), Backspace, Escape (clear all), and % are all supported.

What is the difference between C and CE?

C (All Clear) resets everything including the pending operation and the first operand. CE (Clear Entry) only clears the current number on the display.