Okay. I used graph paper figuring a 2.5" cut center and 2" cut strips.

This means the center finishes at 2" and each log finishes at 1.5"

With the center square and 3 rounds of logs, I get a finished block size of 11".

If you did the same with a 2" cut center square, you would get a finished block size of 10.5".

Here's a PDF of a log cabin with a 2" finished center and 1 1/2" finished logs, just as Prism says. I thought it might help to have a visual.

I have seen log cabin quilts that use different width logs, so you could do a little math and figure it out depending on the number of rounds.

10 inch log cabin block measurements
 

LindaOH - Thank you so very much for the PDF print out of the log cabin with the adjustments to make it a 10 inch block. You are very gracious to go out of your way and spend time doing this for me. It is exactly what I needed and I truly appreciate your help on this. Best regards, Rosalie (sarose48)

I was not familiar with this company but, wow!

I went to kits and found one, Kaffe Kats, using his wonderful fabrics. I really want to do this one.

Thank you for posting the link.

sarose48, just to be clear, Linda's PDF is for an 11" finished log cabin block. This is the one that uses 2" strips but has a center square that is cut 2.5" as you requested.

Prism99 - thanks for the heads up. Guess I will need to make one to get the exact measurements of each log going around. Thanks for your help, it is graciously appreciated.

Hi Rosalie - It was no trouble at all! I've sized it down to ten inches and attached it here. Let me know if you want it any other size - it takes about 15 seconds in ElectricQuilt.

10 inch log cabin block measurements
 

Thank you so much for the log sizes. It appears a quilt software is very handy. I normally do not make log cabin blocks but I saw a table runner done in log cabin blocks with a collection from Moda called Blushing Peonies. It is gorgeous. Can't wait to start making it. I have all the fabrics and all I needed was the cutting measurements. You have been a tremendous help. I am deeply grateful for all your time and help with this. I will post a pic once it is done, which may be a while. Again, I appreciate all the help and comments on QB. Great place to get much needed help. Sincerely, Rosalie

Happy to help! I also love log cabins and just finished a huge one for my niece's wedding. Lots of fun picking out the setting. Have fun, Rosalie!