I have 15 BR's and an 8' by 8' coop, run is in process and is 10' by 20', not sure what you mean by coop/run is 8' by 16'? My run is in addition to, the 8' by 8' coop....my coop is 32 square feet, and my run is 200 square feet. So total square feet is 232 feet.
I live up in the northern part of the US, so the birds will be confined about 3 months of the year to the 8' by 8' coop...I doubt they want to go out in 4 feet of snow...our snow starts here, around Decemeber, and by March is in a pretty good melt...soooo for 9 months out of the year, they will have 232 square feet and approximately 3 months, or less lately, 32 square feet. This is my laying coop. We have other buildings going up, after this project, for other reasons and a back up, two 9' by 12' stalls in our stable that have never been used...so will be used for quarantined new birds, or I need to separate for other resaons..processing, say...ect.
That help any?
Oh, and I raise the BR's because they take the confinement and cold well and are a dual purpose bird, failry good egg layer and good meat, and other reasons...