Systems
OWL Calculator
Windows tool
For people who calculate all day at the counter: the whole expression in front of you, the result under it, and a history that brings back any calculation. One file of about 800 KB that runs on Windows 7 to 11 with nothing else installed.
- Arabic digits ٠–٩ type normally
- Percent the way you think: 50+10% = 55
- Exact: 0.1 + 0.2 = 0.3
- Copies the result without separators, and stays on top of other windows


