About
Set Calculator is a free collection of online tools for set theory and list operations. Start with union, intersection, and difference, compute a Cartesian product, dedupe a list, or sort and reverse items. Browse everything on the all calculators page. Paste lists of items and get an instant result you can copy and reuse.
Who it is for
Students learning set theory, teachers preparing examples, developers comparing lists, analysts cleaning data, or anyone who needs a quick way to combine, overlap, subtract, or pair collections of values.
How it works
- Enter items into Data Set #1 and Data Set #2 using commas, spaces, or new lines.
- On the set operations tool, select Union, Intersection, or Difference.
- On the Cartesian product tool, every ordered pair from the two sets is generated automatically.
- Use List Unique to remove duplicates, or Sort & Reverse to reorder a list.
- Optionally format the output with quotes, new lines, or comma separation.
- Use the sample “Try it!” links to load worked examples.
All calculation runs in your browser. Your list data is not uploaded to our servers to compute results. Preferences such as theme and last inputs may be stored locally on your device.
Design principles
- Fast and focused — one job, done without accounts or installers.
- Clear explanations — short descriptions and Venn-style diagrams for each operation.
- Accessible — light and dark themes, keyboard-friendly controls, and readable layout.
- Private by default — processing stays on-device whenever possible.
Contact
Questions, feedback, or partnership inquiries are welcome on our Contact Us page.
See also our Terms of Use and Privacy Policy.