Basic Calculator
Simple four-function calculator with chain calculations, percentage, and keyboard support.
Calculator
Keyboard-readyKeyboard shortcuts
How It Works
This basic calculator operates like a standard handheld calculator. Enter numbers and operators to build calculations, then press = to evaluate. The result carries forward, so pressing an operator after = continues from the last result (chain calculations).
Chain calculations: Type 5 + 3 = to get 8, then × 2 = to get 16. The calculator remembers the previous result and uses it as the starting point for the next operation.
Percentage: The % button works contextually. On its own, 50% = 0.5. With an operator, 200 + 10% = 220 (10% of 200 is added to 200).
Edge cases: Division by zero displays "Error". Very large or small numbers are shown in scientific notation. The ± button toggles the sign of the current number.
Tips & Best Practices
Frequently Asked Questions
How do chain calculations work?
When you press = to get a result, the calculator remembers it. If you then press an operator (like ×), it uses the result as the first number in the next calculation. For example: 5 + 3 = 8, then × 2 = 16.
How does the percentage button work?
The % button has two behaviors. Without a preceding operator, it divides by 100 (so 50% = 0.5). With a preceding operator, it calculates the percentage of the first number. For example, typing 200 + 10 % = gives 220, because 10% of 200 is 20, and 200 + 20 = 220.
What happens with division by zero?
Dividing by zero displays 'Error'. Press C to clear and start a new calculation.