A standard loveseat is about 51 inches long, not less than 40, and not more than 60. However, there have been changes in arm-to-arm length over the years due to evolving lifestyle needs. Below are the size variations to expect; • Designed for one: 51 inches  • Small ones: 52 inches  • Medium-size: 58 inches  • Full size: up to 64 inches  • Loveseat couches: up to 71 inches