Select Size. 4x8 in 6x12 in 8x8 in 8x16 in 12x12 in 12x24 in 16x16 in 16x24 in 24x24 in. Width ft in. Lenght ft in. Calculate. *Note: The Calculated amount is the exact square footage. Travertine is a natural stone and during installation there might be breakage and waste. Recommended extra amount will be 10%.