Pick the room, enter a few measurements and get the rug size that fits, plus the closest standard size to buy.
Ideal rug size
Largest that fits
Best standard size
Your options
Rules used: about 18 in (46 cm) of bare floor between the rug and the walls where the room allows, and never less than about 12 in (30 cm) in a living room or bedroom; dining rugs extend 24 to 36 in (61 to 91 cm) past each side of the table so pulled-out chairs stay on the rug; bedroom rugs extend at least 24 in (61 cm) past the sides of the bed; runners stop about 5 in (13 cm) from the walls and ends. Standard sizes vary by shop. Results are planning estimates.