Collatz Sequence Calculator (3n+1)
Math ToolsSteps and peak value for the 3n+1 problem
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All history →Collatz Sequence Calculator (3n+1) — at a glance
Follow a number as it falls to 1 under the Collatz rule.
How to use it — step by step
A positive whole number to start from.
Add your text
Paste or type your input into the box. The Sample button fills in an example.
Press Generate Sequence
The result is made instantly inside your browser.
Copy the result
Use the Copy button, or send it to another tool.
Pro tips
Small things that make the result better.
Quick facts
Frequently Asked Questions
What is the Collatz conjecture?+
It says every positive start number eventually reaches 1. It is unproven.
Is there a limit?+
Starting numbers up to a trillion are accepted.
Is my data safe?+
Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.
Is this tool really free?+
Yes — completely free, no signup, no watermark and no usage limit.