Collatz Sequence Calculator
Collatz Sequence with stated conventions, validation and a worked example.
Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- An exploratory sequence tool, not a proof of the Collatz conjecture. Start at most 100 digits; bounded to 10,000 steps.
Example Calculation
- Positive starting integer: 6
- Maximum steps: 1000
6→3→10→5→16→8→4→2→1 takes 8 steps.
Frequently asked questions
How do I use this calculator?
Enter positive starting integer, maximum steps. The result updates automatically. Use Reset to restore the example values.
What method does it use?
Even n → n/2; odd n → 3n+1; stop at 1 or the step limit.. An exploratory sequence tool, not a proof of the Collatz conjecture. Start at most 100 digits; bounded to 10,000 steps.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.