Length and width in inches — square inches with square feet alongside, for panels, vents, prints and cut lists.
Square inches are the unit of louvers, filters, speaker grilles and the print area on labels — anything sized in inches that needs to fit in a hole sized in inches. The calculator converts to square feet too, because ventilation specs often flip between the two mid-document.
Yes — every calculator on this site is free, runs entirely in your browser, and requires no signup.
The formulas are the standard ones used in the trade, accurate to fractions of an inch or pound; add a small waste margin to every order.
Slabs and pads: cubic yards and bag counts in seconds.
Open →Cubic yards and tonnage for driveways, paths and bases.
Open →Cubic yards and 2-cu-ft bag counts for any bed size.
Open →Cubic yards and tons for bedding, play sand and fill.
Open →Cubic yards and tons for lawns, beds and leveling.
Open →Total bag count for any fence run, split per hole.
Open →Missing a feature or found something off? Tell us — user suggestions decide what we build next.