Math calculator
Basic Calculator
A simple online calculator with a keypad for everyday addition, subtraction, multiplication, and division.
Quick answer
How do you use a basic calculator?
Type the first number, tap an operator (+, −, ×, ÷), type the second number, and press =. For example 250 × 0.15 = 37.5. Use C to clear and ⌫ to fix a typo.
Supports +, −, ×, ÷, %, ± (sign), decimal point, backspace, and clear.
⚡ Answer updates as you type · Enter = calculate · Esc = reset
Tip: your keyboard works too — number keys, + − * / . Enter (=), Backspace, and Esc to clear.
The Basic Calculator is a simple keypad for everyday math — add, subtract, multiply, and divide, just like a standard school or desk calculator. Keyboard input is fully supported.
About this Basic Calculator
The Basic Calculator is a simple on-screen keypad for the everyday math most people actually do — adding a bill, subtracting change, multiplying quantities, or dividing a total. It works just like the standard calculator on a phone or school desk.
What you'll need
- • Digits 0–9 and a decimal point
- • Operators: +, −, ×, ÷
- • Helpers: % (percent), ± (sign), ⌫ (backspace), C (clear)
How it works
- 1. Tap or type the first number.
- 2. Choose an operator (+, −, ×, ÷).
- 3. Enter the next number.
- 4. Press = to see the result, or chain another operator to keep calculating.
- 5. Use C to clear, ⌫ to fix a typo, and ± to flip the sign.
Worked example
Type 12 + 8 = to get 20. Type 250 × 0.15 = to get 37.5 (a 15% tip on $250). Type 100 ÷ 4 = to get 25.
Related searches
Basic Calculator FAQ
What is the Basic Calculator?
The Basic Calculator is a free online tool that helps you a simple online calculator with a keypad for everyday addition, subtraction, multiplication, and division.
How do I use the Basic Calculator?
Open the Basic Calculator, enter the requested values, and review the instant estimate on the page.
Is the Basic Calculator free?
Yes. The Basic Calculator is free to use on Fast Online Calculator and does not require an account.
Can I use my keyboard?
Yes. Number keys, +, −, *, /, . and Enter (=) all work, plus Backspace to delete a digit and Esc to clear.
Does it handle order of operations?
Like most standard/school calculators, it evaluates left to right as you press each operator. For strict order of operations (PEMDAS), use the Scientific Calculator.
Is there a limit on the numbers I can enter?
You can enter very large or very small numbers. Extremely long results are shown in shortened form to keep the display readable.
Related calculators
Math
Scientific Calculator
Use arithmetic, square roots, powers, trigonometry, logarithms, and percent tools.
Math
Fraction Calculator
Add, subtract, multiply, and divide fractions with simplified answers, mixed numbers, and steps.
Math
Percentage Calculator
Find percentages, percentage increase, and percentage decrease quickly online.
Finance
Tip Calculator
Calculate tip amount, total bill, and split cost per person.