MATH · SCIENTIFIC
Scientific Calculator
A full-featured scientific calculator with basic arithmetic, square root, squaring, reciprocal, percent, and ±. Keyboard-accessible with roving focus navigation.
About This Calculator
A phone-style scientific calculator with a button grid. Supports addition, subtraction, multiplication, division, square root, squaring, reciprocal, percent, and sign-change. Fully keyboard-accessible — use 0–9, +−×÷, Enter for equals, Escape to clear, and Backspace.
How It Works
The calculator uses left-to-right (phone-calculator) evaluation — not algebraic operator precedence. Pressing an operator immediately applies any pending operation: 3 + 4 × 2 evaluates as (3+4)×2 = 14, not 3+(4×2) = 11. This matches the behavior users expect from a button-grid calculator.
Frequently Asked Questions
- Does this calculator follow standard order of operations?
- No — it uses left-to-right (phone-calculator) evaluation. Each operator is applied immediately when pressed. For algebraic precedence, use the separate expression-based tools in the Math category.
- How do I use the keyboard?
- Type 0–9 for digits, period for decimal, + − * / for operations, Enter or = for equals, Escape or C to clear, and Backspace to delete the last digit. Arrow keys navigate between buttons when using keyboard focus.
- What does 1/x (reciprocal) do?
- Reciprocal returns 1 divided by the current number. For example, the reciprocal of 4 is 0.25. The reciprocal of 0 produces an error.