Question: how much bigger is the x5 than the x3?
Answer: The BMW X5 model is almost 9 inches longer, 4 inches taller and 2.25 inches wider than the BMW X3. Due to the bigger size, the X5 offers a slightly bigger cargo space. The X5 offers an optional third row seating, allowing seating for up to 7 seats while the X3 comes with a standard five seats.