Free standard online digital calculator with memory, square root, percentage, calculation tape history, and full keyboard shortcut support.
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A clean, responsive, digital four-function pocket calculator built for fast daily arithmetic. It supports addition, subtraction, multiplication, division, square roots, percentage calculations, sign toggling, and a live calculation tape history that remembers previous operations.
A + B, \quad A - B, \quad A \times B, \quad \frac{A}{B}, \quad \sqrt{x}, \quad x \%Built using IEEE-754 precision correction to avoid common binary floating-point rounding errors (e.g. 0.1 + 0.2 = 0.3).
Scenario: Calculating total shopping cost with tax: $45.50 + $28.00 = $73.50, then adding 8% sales tax.
Enter 45.5 + 28 = 73.5.
Press + 8 % to calculate $5.88 tax.
Press = to get the final total of $79.38.
Yes! The calculator actively listens to keyboard events including 0–9, decimal (.), +, -, *, /, Enter (=), Backspace, and Escape (C).
Enter the base number, press an operator like + or -, enter the percentage number, and click %. For instance, 100 + 15 % = 115.
Yes. The calculation tape on the right records your latest calculations so you can audit previous entries or recall values with one click.
Yes. The interface is 100% responsive with large touch-friendly targets and prevents accidental mobile browser zoom.
Quickly calculate percentages, find what percentage one number is of another, and compute percent changes.
Compute the arithmetic mean, median, mode, sum, count, and range for any set of numbers.
Calculate the percentage increase or decrease between two values, along with absolute difference and growth multipliers.
Perform calculations on the left to record history here.