Basic Calculator
A simple, no-frills calculator for basic addition, subtraction, multiplication and division.
- A12
- B8
- Result (A + B)20
A + B = 20 — see how the result sizes up against the two numbers you started with.
ƒShow your work
- 112 + 8 = 20
About the Basic Calculator
A basic calculator handles the four operations that cover most of everyday math: addition, subtraction, multiplication and division. No trig, no logs, no memory keys — just two numbers, one operation, one answer, which is exactly what most quick calculations actually need.
It's the calculator people reach for splitting a bill, checking a receipt total, doubling a recipe, or working out a quick homework problem that doesn't call for anything scientific. Because there's only one operation happening at a time, there's no order-of-operations ambiguity to worry about — pick A, pick the operation, pick B, and the answer is unambiguous.
If your problem involves more than one operation chained together, parentheses, or functions like square roots and exponents, the scientific calculator on this site handles that same arithmetic plus everything past it.
Frequently asked questions
What happens if I divide by zero?
Division by zero is mathematically undefined, so this calculator flags it as an error rather than returning a number — there's no finite value that correctly answers 'how many times does zero go into this.'
Can I use negative numbers?
Yes — enter a negative value directly (e.g. -8) in either the A or B field and it's handled the same way any positive number would be, following standard sign rules for addition, subtraction, multiplication and division.
What's the difference between this and the scientific calculator?
This one performs a single operation between two numbers. The scientific calculator evaluates a full expression — parentheses, multiple operations, exponents, roots, trig and logarithms all at once.
Does this calculator round the answer?
Results are shown to a high level of precision (up to 8 decimal places when the division isn't exact), so you're seeing the real computed value rather than a rounded approximation.
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