What it does
Calculator-1.com offers everyday arithmetic, scientific and percentage calculators with keyboard and pointer input.
Calculator-1.com uses keyboard or pointer input, with distinct Mathematical and Accounting modes. Mathematical mode supports parentheses; Accounting evaluates in entry order, so check the mode before a mixed expression. C clears the running calculation while preserving memory, whereas AC also clears saved values. Three memory cells have add, subtract, recall and clear controls. Percentage examples distinguish taking a portion from adding a percentage to a base. Copy controls expose the result, calculation and memory value. Display rounding offers zero to ten decimal places or F, and a mobile layout enlarges the buttons.
Strengths
- Keyboard and mouse input
- Published instructions explain clear and memory controls
Best for
- Quick arithmetic with familiar calculator buttons
Sources
- The Best Free Online Calculator (Oct 26, 2026)