Perform four-function math with parentheses, percent, memory slots, and a running tape. Every control works by mouse, touch, or keyboard.
Tips for fast use
Type directly from your keyboard or use the on-screen keys. Parentheses, percent, and repeated operators stay available without switching modes.
Use the memory row for one stored value while you work: MS stores the current result, MR recalls it, and M+ or M- update memory without leaving the current calculation.
The tape keeps the latest 20 lines. Click any saved line to pull its result back into the display, or use Copy result URL to reopen the same expression from a shareable link.
FAQ
How does the tape history work?
Every calculation adds the expression and result to the tape. Click a line to bring the answer back into the display. The last 20 entries stay available.
How is the percent key handled?
For addition and subtraction the percent refers to the previous term. For multiplication or division it simply divides the current number by 100.
How do the memory keys work?
MS stores the current result, MR recalls it, MC clears it, and M+ or M- add or subtract the displayed value from memory.
What does Copy result URL include?
The share link keeps the current expression in the query string so the page can reopen the same calculation. It is useful for bookmarking or sending a reproducible result.