Introduction
This free online calculator lets you add, subtract, multiply, and divide numbers right in your browser. Type numbers with your keyboard or click the buttons on screen. It works on phones, tablets, and computers.
The calculator shows your answer as you type, so you can catch mistakes fast. It also saves a history of past calculations, stores numbers in memory, and supports keyboard shortcuts for quick use. Whether you need help with homework, a recipe, or a budget, this simple calculator gets the job done.
How to Use Our Simple Calculator
Enter numbers and pick a math operation to get your answer. The calculator shows your equation on top and the result below it.
Number buttons (0–9): Click any digit to type a number into the calculator display.
Decimal point (.): Click the dot button to add a decimal point to your number.
Add (+), Subtract (−), Multiply (×), Divide (÷): Click an operator after your first number, then type your second number.
Equals (=): Click this button to calculate your answer. The result shows on the display and the equation saves to your history.
All Clear (AC): Click this to erase everything and start a new calculation from zero.
Backspace (⌫): Click this to delete the last digit or operator you entered.
Plus/Minus (±): Click this to switch your current number between positive and negative.
Answer (Ans): Click this to reuse the result from your last calculation.
Memory Add (M+): Click this to add the current value to the stored memory.
Memory Subtract (M−): Click this to subtract the current value from the stored memory.
Memory Recall (MR): Click this to place the stored memory value into your current calculation.
Memory Clear (MC): Click this to reset the stored memory back to zero.
History: Past calculations appear at the bottom of the calculator. Click any history entry to insert that result into your current equation.
Size / Zoom: Use this dropdown to make the calculator smaller or larger on your screen.
Layout: Switch between Desktop and Mobile view to fit your screen size.
Full Screen: Click this button to expand the calculator so it fills your entire screen.
Keyboard Shortcuts: Click this button to see a list of keys you can press instead of clicking buttons.
What Is Arithmetic?
Arithmetic is the most basic branch of math. It deals with four main operations: addition, subtraction, multiplication, and division. These are the building blocks for all other types of math. You use arithmetic every day when you count money, split a bill, measure ingredients, or figure out how long a trip will take.
The Four Basic Operations
Addition (+) combines two or more numbers into a larger total. Subtraction (−) takes one number away from another. Multiplication (×) is a fast way to add the same number many times. Division (÷) splits a number into equal parts.
Order of Operations
When a math problem has more than one operation, you must solve it in the right order. Multiplication and division always come before addition and subtraction. This rule keeps answers consistent no matter who solves the problem. This calculator follows that rule automatically.
Why Arithmetic Matters
Strong arithmetic skills help you in school, at work, and in daily life. Shopping, cooking, budgeting, and building all rely on quick, accurate calculations. A simple calculator like this one lets you check your work and solve problems faster when the numbers get large or tricky.