Sumyard

Basic calculator

Everyday arithmetic with parentheses, memory and a calculation tape.

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Your inputs

Updates as you type
Use parentheses, + − × ÷, ^ for powers, and % to divide a value by 100.
Memory: 0

result

240

(125 + 75) * 1.2 = 240

Calculations happen in your browser. Saving is optional.

Calculation tape

Calculate an expression, then choose “Add to tape” to keep an editable record here.

How to use this tool

Enter an expression or use the keypad, with parentheses where needed.

The answer updates immediately. Add it to the tape to keep a visit-only record, or save the calculation for later.

Parentheses → powers → multiplication/division → addition/subtraction

Worked example

240 · result

Fixed example using the settings below. Monetary examples use USD; dates and times use their stated reference values. This example stays unchanged when you edit your calculation.

Example inputs
  • Expression: (125 + 75) * 1.2

Method illustration: (125 + 75) × 1.2 = 240. Standard precedence gives 2 + 2 × 3 = 8.

Assumptions and limits

  • Percent is a mathematical postfix operation: 10% means 0.1. To add 10% to 200, enter 200 × (1 + 10%).
  • Exponentiation is right-associative: 2^3^2 = 512. Arithmetic uses JavaScript floating-point numbers; results display up to 10 decimal places.
  • Memory and the calculation tape last for this visit. Save a result to keep it on this device.

Check or report a result

Check the units, selected calculation and assumptions first. Compare the fixed example above with your inputs to identify what changed.

Report a calculation issue with the page address, hypothetical inputs, result displayed and result expected. Do not include passwords, bank details or other private information.