Online Calculator

Free online calculator for quick math, arithmetic, scientific functions, and percentage calculations with full keyboard support.

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How to use Online Calculator

1
Enter numbers and mathematical operators using your keyboard or on-screen buttons.
2
Press "=" or Enter to compute the calculation result.
3
View past calculations in the history panel and reuse previous values.

Perform basic arithmetic, powers, square roots, trigonometry (sin, cos, tan), and percentages.

Use your physical numeric keypad and standard keyboard keys for fast calculations.

Easily track, copy, and review recent calculation steps without losing your place.

Can I use my physical computer keyboard with this calculator?

Yes. Standard number keys, operators (+, -, *, /), Enter, and Backspace are supported.

Does it support scientific calculations?

Yes. Functions like square root, powers, pi, parenthesis, and trigonometric ratios are available.

Is calculation history saved when I close the tab?

Calculation history is kept during your current session for easy referencing.

Everyday Utilities

Calculate percentage change, difference, discounts, and common percentage formulas.

Convert length, area, mass, volume, temperature, speed, and time across metric, U.S., and Imperial units.

Calculate final sale price, percent or fixed savings, and optional sales tax.

Calculate tip amounts and split restaurant bills evenly among people.

Remove repeated lines while preserving their first occurrence.

Sort lines naturally, alphabetically, or by length.