What operations does a basic calculator support?

Addition, subtraction, multiplication, and division, along with common helpers like percent, sign change, and square root. That covers the vast majority of everyday math, from splitting a bill to checking a receipt.

Does the calculator follow the order of operations?

Chained entry on simple calculators is evaluated left to right as you type, which can differ from the algebraic order of operations (PEMDAS). For expressions that mix multiplication and addition, compute the multiplication step first or use parentheses where available.

How do I calculate a percentage?

To find x% of a number, multiply the number by x and divide by 100 — 15% of 80 is 80 × 15 ÷ 100 = 12. To add a percentage (like tax), multiply by 1 plus the rate: 80 × 1.15 = 92.

Why do I sometimes get long strings of decimals?

Some exact fractions, like 1 ÷ 3, have no finite decimal representation, and computers store numbers in binary floating point, which can introduce tiny rounding artifacts (like 0.30000000000000004). Round your final answer to the precision you actually need.

Basic Calculator

Simple calculator for basic arithmetic operations and everyday math. Free, fast, accurate — no signup, mobile-friendly,

Calculator Features

• AC = All Clear (reset calculator)
• CE = Clear Entry (clear current number)
• 📋 = Show/hide calculation history
• Supports decimal calculations and large numbers
• Keeps history of your last 10 calculations

How it works

A basic calculator performs the four arithmetic operations — addition, subtraction, multiplication, and division — following the standard order of operations so expressions evaluate correctly.

Order of operations (PEMDAS)

Parentheses → Exponents → Multiply/Divide → Add/Subtract

× ÷: evaluated left to right, before + and −
+ −: evaluated last, left to right

Worked example

Evaluate 2 + 3 × 4

Multiplication first: 3 × 4 = 12
Then add: 2 + 12

2 + 3 × 4 = 14 (not 20).

Good to know

Multiplication and division outrank addition and subtraction — order matters.
Use parentheses to force a different order: (2 + 3) × 4 = 20.
Division by zero is undefined.