ZovaTool

Basic Calculator

 
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How to use the Basic Calculator

  1. Tap the digit keys (0–9) to enter your first number.
  2. Choose an operator: + for addition, − for subtraction, × for multiplication, ÷ for division.
  3. Enter the second number, then press = to see the result.
  4. Use AC to clear everything, or ⌫ to delete the last character.
  5. Press % to convert the current number into a percentage (divides by 100).
  6. Use ± to flip the sign of the current number from positive to negative.
  7. For chained calculations, just keep tapping operators — results carry forward.
  8. Tap M+ to add the display value to memory, M− to subtract, MR to recall, MC to clear.
  9. Use scientific keys (sin, cos, tan, log, ln, √, x², 1/x) for advanced math.
  10. Wrap parts of an expression in ( ) to control the order of operations.
  11. Tap π to insert pi (3.14159…) directly into your expression.
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Why every desk still needs a calculator

From quick grocery math to engineering work, the humble calculator remains one of the most-used tools on any device. Our basic calculator pairs a clean, distraction-free keypad with a small set of scientific helpers — so 95% of everyday math fits in a single screen.

Memory keys (MC, MR, M+, M−) are useful when you want to stash a subtotal while you keep computing. For example, total the line items of an invoice, save it with M+, calculate the tax separately, then add MR back in at the end.

Percent (%) is interpreted contextually: 200 + 15% returns 230 because the operator converts the rate against the running total. This matches how most physical calculators behave and avoids confusing edge cases.

Need trigonometry? sin, cos and tan all work in degrees by default — handy for quick geometry, construction estimates and physics homework. Switch to radians by passing values yourself through the ( ) operator.

Tip: keyboard input is supported on desktop. Use number keys, +−*/, Enter for =, and Backspace for ⌫.