Standard Size 42" wide with Fleur Style arms, made in a variety of lengths. To calculate the size you need first consider the distance between dining table legs, then assume each person will need at least 24" or more. In a pinch more people can be crowded in such they do need a full 24", but plan on a minimum of 24" per person. Often the Liffey Bench is used in a hall where seating constraints do not exist.
The Liffey Bench is purposed most often as a "Hall Bench", ie not something people sit on for long periods. In fact it usually has items deposited on it when people enter. Therefore we make it with a flat wood seat. If you want a bench to place around a dining Table see the "Cove Bench". It is made for serious sitting at a table. Or we make Pacific and Kyoto benches with backs which are also made for hours of sitting and dinner parties.