Why did my actual brick usage exceed the calculator’s estimate on site?

Common reasons include more breakage than typical, additional cutting for non-standard openings or curved features, mortar joints thicker than assumed, or simply a mason's working style that uses more material than the calculator's baseline. Compare your as-built wall dimensions against what was entered into the calculator, since a discrepancy in actual wall length or height is often the real explanation rather than the calculator itself being inaccurate.