Terms of use

This is a planning aid

Baseball Lab calculates pitch limits and rest days from published rules. It is not a compliance guarantee and it is not an official record. The manager is responsible for knowing when a pitcher must be removed, and the league's own scorekeeping is what counts in a protest.

Rules change, and local leagues set stricter limits than the published ones. Check the source and effective date shown beside any number here against your current rulebook.

Not medical advice

The arm-care content reproduces guidelines from Little League and USA Baseball's Pitch Smart. It is not medical advice and it does not replace a doctor. If a young player's arm hurts, that is a conversation with a parent and a professional, not with an app.

Using the service

• Accounts are invite only, and are for coaches and team officials.

• You are responsible for what you put in your roster. Keep it to what the tools need — a first name and a last initial is enough, and jersey numbers alone work.

• Do not share a team code with anyone you would not hand a team sheet to.

• The service is provided as it is, without warranty. It may be unavailable, and data may be lost — keep your league's own records.

The privacy page covers what is stored and what is not.

Little League® is a registered trademark of Little League Baseball, Incorporated. USA Baseball and Pitch Smart are marks of their respective owners. This product is not affiliated with, endorsed by, or sponsored by any of them.