Insulation Calculator

Estimate how many insulation packs, rolls, or boards to buy for a wall, attic, floor, or ceiling job. Enter area directly or use a quick length x width helper, subtract openings, add waste, and see the rounded-up purchase count plus leftover coverage.

How It Works

Formula

Ag={Addirect area entryLWlength x width helperA_g = \begin{cases} A_d & \text{direct area entry} \\ L \cdot W & \text{length x width helper} \end{cases}

An=AgAoA_n = A_g - A_o

Aa=An(1+w100)A_a = A_n \cdot \left(1 + \frac{w}{100}\right)

N=AaApN = \left\lceil \frac{A_a}{A_p} \right\rceil

Ab=NApA_b = N \cdot A_p

Al=AbAaA_l = A_b - A_a

Frequently Asked Questions

Related Calculators

All calculators

Ready to Calculate?

Free calculators.