Response from LEGO SHOP
November 26, 2017
Jordan, Consumer ServicesOur measurements are always a little funny when it comes to actual measurements as we have historically measured everything in stud length. So this baseplate is a 24 studs by 24 studs (minus one stud in each rounded corner). It is approximately a 15 inch square but we would never recommend building your table then buying this baseplate to fit in it. We would recommend buying the baseplate first so that you can verify how it works prior to building or buying the table. I hope that makes sense.