Standard hot tub dimensions are as follows: Small Hot Tubs: 5'4” – 7” (Length) x 5'4” – 6'8” (Width) x 29” – 35” (Height) Medium Hot Tubs: 6'6” – 7'9” (Length) x 6'4” – 7'9” (Width) x 33” – 38.5” (Height) Large: 7' – 9” (Length) x 7' – 9'2” (Width) x 36” – 38” (Height)