Basic Calculator
Do quick everyday sums with a simple online calculator for adding, subtracting, multiplying and dividing, free and instant in your browser.
Type directly or tap the pad. Press Enter or = to evaluate. History stays on this device — nothing is sent anywhere.
How to use this calculator
- Tap the number and operator buttons, or just type in the box.
- Use brackets to group, then press = (or Enter) for the answer.
- C clears, ⌫ deletes the last entry, and Ans reuses your last result.
How it works
It evaluates the whole expression with correct order of operations (brackets, then × and ÷, then + and −), so 2 + 3 × 4 = 14, not 20.
Everything is worked out in your browser — no sign-up and nothing sent to a server.
Worked example
2 + 3 × 4. = 14 (multiplication before addition).
Common mistakes
- Forgetting brackets — type (2 + 3) × 4 when you want the addition done first.
- Expecting left-to-right order — the calculator follows standard maths precedence.
Frequently asked questions
Does it follow order of operations?
Yes — it uses BODMAS/PEMDAS: brackets first, then powers, then × and ÷, then + and −.
Can I use my keyboard?
Yes — type the numbers and operators directly and press Enter to evaluate.
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Cite this tool
Zerdly. (2026). Basic Calculator. Retrieved from https://www.zerdly.com/tools/basic-calculator/
Tip: Enter any known values to calculate the remaining results.
Designed to run locally in your browser. Tool inputs are not intentionally stored by Zerdly unless stated otherwise.