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Calculator

Quick arithmetic with parentheses and percentages.

Free to use, no sign-up required. Calculator is one of 198 tools built into Xenition, alongside a chat that can use them for you.

A basic calculator for everyday arithmetic with brackets and percentages. You can tap the keys or type a whole expression, and it shows the answer as you go.

How to use Calculator

  1. Type an expression in the display or build it with the keys: digits, +, -, * (multiply), / (divide), brackets and %.
  2. Watch the answer update beneath the expression.
  3. Press = to replace the expression with its answer and keep calculating from it.
  4. Press Clear to start again.

How it works

Standard operator precedence applies: brackets first, then multiplication and division, then addition and subtraction. The % sign always means divide by 100, so 15% is 0.15. Answers are rounded to 10 decimal places, and anything that is not a number, such as division by zero, shows Error.

Example

250 × 15% gives 37.5, a 15% tip on 250. (12.5 + 7.5) × 4 gives 80.

Questions about Calculator

Why does 200 + 10% give 200.1 and not 220?

Here % simply divides by 100, so 200 + 10% is 200 + 0.1. Some pocket calculators treat + 10% as add ten percent. To add 10% here, type 200 × 1.1 or 200 + 200 × 10%, which both give 220.

Why does 0.1 + 0.2 sometimes show 0.30000000000000004 elsewhere?

Computers store decimals in binary, and 0.1 cannot be stored exactly. This calculator rounds to 10 decimal places, so it shows 0.3.

Use it from chat

You do not have to open Calculator to use it. Ask Xenition in plain language and it runs the right tool, then carries the answer into whatever you are working on — a document, a spreadsheet, a deck.

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