HouseMath is a set of free project calculators built by a working blue-collar operator who got tired of driving back to the store for the second bag of mulch.
Every tool follows one rule: end with a shopping list in the units the store sells — bags, gallons, boxes, rolls, sticks, pallets — with a sensible waste allowance built in and every assumption printed on the page. The coverage rates come from standard industry figures and manufacturer norms; where your product’s label differs, the label wins.
The calculators run entirely in your browser. Nothing you type is sent anywhere or stored by us.
Spotted an error or want a calculator added? Use the contact page — fixes ship fast.