About the size of calibration plate

Hello every one!
I want to measure a object by camera.
The object size to be measured is 11 meters by 10 meters ,what size of calibration plate need to be chosen?
Thanks!

The calibration plate is too big ,can I use a smaller calibration plate by taking more photos of the calibration plate?The camera coverage is 12mx10m.Thanks!

the size of the calibration plate doesn’t matter. why do you think it does?