I have been asked quite a few times about how the notes work on saxophones, what you see on a tuner, etc.

So here’s a chart. Concert notes in the middle alto (and bari on the left) and tenor (and soprano) on the right. You can also compare alto to tenor on the same row.

If you’re having trouble with transposing, you could save this image on your phone for reference.

Go to https://saxstation.com/downloads to get a larger version, a fingering chart, and some other things. Follow the directions and subscribe to get access if you have not already.