Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Roof Shingle Estimator (with Pitch)

Estimate the shingle bundles needed for a roof using the building footprint and the roof pitch. Enter the footprint length and width, choose the pitch to set the slope multiplier, add a waste allowance, and pick the shingle type to get the bundle count.

Footprint Length (ft)

Footprint Width (ft)

Roof Pitch

Waste Allowance (%)

Shingle Type

Construction

Concrete Slab Bag Calculator

Find out how many bags of pre-mixed concrete you need to pour a slab. Enter the slab length, width, and thickness, pick your bag size, and add a waste allowance to get the exact bag count for footings, patios, shed bases, and walkways.

Slab Length (ft)

Slab Width (ft)

Slab Thickness (in)

Bag Size

Waste Allowance (%)

Key differences

	Roof Shingle Estimator (with Pitch)	Concrete Slab Bag Calculator
Category	Construction	Construction
Inputs required	5	5
Result	Shingle Bundles Needed (bundles)	Bags of Concrete Needed (bags)
What it does	Estimate the shingle bundles needed for a roof using the building footprint and the roof pitch. Enter the footprint length and width, choose the pitch to set the slope multiplier, add a waste allowance, and pick the shingle type to get the bundle count.	Find out how many bags of pre-mixed concrete you need to pour a slab. Enter the slab length, width, and thickness, pick your bag size, and add a waste allowance to get the exact bag count for footings, patios, shed bases, and walkways.