Calculator
A simple online calculator. Type or tap like a phone — 200 + 10% is 220, and your tape stays on this device.
This is a basic arithmetic calculator. Use the Percentage, Scientific, Fraction, or Average calculators for those specific jobs.
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What is this calculator?
This is a free online calculator for everyday arithmetic: addition, subtraction, multiplication, and division. It works like a phone pad — 200 + 10% is 220 — and the tape stays on this device.
It follows standard order of operations. 2 + 3 × 4 is 14, not 20. Use parentheses when you want addition first. For percent-of, increase, or markup questions, open the Percentage Calculator.
What can you use this calculator for?
- Quick totals: 25 + 75 = 100
- Price checks and simple differences
- Homework arithmetic before you submit
- Tax or tip on a total: 200 + 10% = 220
- A 15% amount via 80 × 15% = 12 — then use the Percentage Calculator for difference or markup
How to use the calculator
- Enter the first number with the pad or your keyboard.
- Choose +, −, ×, or ÷.
- Enter the next number. Add parentheses if you need a different order.
- Press = or Enter.
- Copy the result, tap a tape line to reuse it, or press an operator to continue from the answer.
How calculator calculations work
Expressions use PEMDAS without exponents: parentheses first, then multiplication and division left to right, then addition and subtraction left to right. The % key works like a phone: add or subtract a percent of the current amount (200 + 10% = 220), or take a percent with multiply (80 × 15% = 12).
| Symbol | Operation | Order |
|---|---|---|
| ( ) | Grouping | First |
| × ÷ | Multiply / divide | Before + and − |
| + − | Add / subtract | Last, left to right |
Calculator examples
25 + 75 = 1002 + 3 × 4 = 14— multiplication first(2 + 3) × 4 = 20— parentheses first200 + 10% = 220— add 10% of 20080 × 15% = 12— 15% of 8010 ÷ 0— error; division by zero is undefined
Different ways people search for this
If you searched for an online calculator, a free calculator, a simple calculator online, or an online calculator with history, this page is the four-function pad: type or tap like a phone, then equals. The same searches with a specialist word — percentage, scientific, fraction, or average — belong on those dedicated EverydayTools pages, not here.
Common calculator mistakes
- Expecting 2 + 3 × 4 to equal 20. It equals 14 unless you add parentheses.
- Forgetting a minus sign on a negative number.
- Typing two operators in a row, such as 2++3.
- Dividing by zero.
- Using this pad for trig or logs — that belongs on the Scientific Calculator.
Related calculators
- Percentage Calculator for percent of, increase, decrease, and markup.
- Scientific Calculator for sin, log, powers, and roots.
- Fraction Calculator for mixed numbers and simplifying fractions.
- Average Calculator for the mean of a list.