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Fiber Cement Siding Calculator
Estimate boards, waste, and rough cost for fiber cement siding — including HardiePlank-style lap siding.
About fiber cement siding estimates
Fiber cement is durable and fire-resistant, but it's heavier and cuts differently than vinyl or wood, which usually means more waste from breakage and precise cuts. That's why this calculator defaults to a slightly higher 15% waste allowance — you can adjust it if your installer estimates differently.
The most common brand of fiber cement lap siding in the U.S. is HardiePlank, made by James Hardie Building Products. This calculator works for any fiber cement product, HardiePlank included, since the board sizing and installation method are essentially the same across brands.
HomeSidingCalculator.com is not affiliated with, endorsed by, or sponsored by James Hardie Building Products. "HardiePlank" and "Hardie" are trademarks of their respective owner, referenced here only to describe the product category.
Fiber Cement Siding Calculator
Enter your home dimensions to get an instant estimate.
Working with a different material? Use the general Siding Calculator instead.
Fiber Cement & HardiePlank Cost Guide
Straight answers to the questions we hear most about fiber cement pricing.
How much does Hardie plank siding cost per square foot?
Installed, HardiePlank and other fiber cement lap siding typically runs a rough U.S. national average of roughly $9–$14 per square foot, combining material and labor. That works out close to the per-square rates used in this calculator. Your actual price depends heavily on region, home height and complexity, and whether the boards are pre-primed or pre-finished.
What's the difference between "Hardie board" and generic fiber cement?
"Hardie board" and "HardiePlank" are brand names for James Hardie's fiber cement products — they're not a different material category. Generic fiber cement siding from other manufacturers uses the same core material and installs the same way, though board dimensions, warranty terms, and finish options can differ slightly by brand. This calculator's board sizing works for either.
What does labor cost to install Hardie siding?
Labor for fiber cement typically costs more than vinyl because the boards are heavier, need specific blades to cut cleanly, and require more careful fastening. Budget roughly 55–65% of your total project cost toward labor — the "Estimated Labor Cost" figure in this calculator already reflects that split.
Do I need special tools to cut Hardie siding?
Yes — fiber cement is typically cut with a saw fitted with a carbide-tipped blade designed for fiber cement, and cutting it produces fine silica dust, so dust control (a shear, dust-collecting saw, or cutting outdoors with a respirator) is standard practice. This is one reason fiber cement labor costs run higher than vinyl.
Tips for fiber cement projects
Fiber cement boards are heavy and typically require a carbide-tipped blade and dust control when cutting — factor in extra labor time compared to vinyl. Pre-primed and pre-painted boards cost differently; the estimate here reflects a mid-range average. Fasteners and caulking are not included in this estimate.