Math for any
project.
Fast, dead-simple calculators for what you actually buy and install — pro or DIY. No signup, no popups, works on a 4G phone with one bar.
Material calculators for any project around the house — concrete bags or yards for slabs, drywall sheets for a remodel, paint gallons by room, mulch and gravel by the yard, sod pallets, deck stain, fence posts, tile, and roofing shingles. Get the right amount the first time so you're not making a second trip to Home Depot.
Pro-grade calculators for the trades — voltage drop to NEC spec, board feet for lumber orders, BTU sizing for HVAC, brick counts with mortar bag estimates, and pipe water capacity. Built for contractors, electricians, framers, and anyone bidding a job.
Quick money math — mortgage monthly payment with full amortization summary, restaurant tips with bill split. More finance calculators coming.
What is ProjectCalc?
ProjectCalc is a free collection of 20calculators for construction, home improvement, and DIY projects. Whether you're a contractor sizing a job or a homeowner figuring out how much paint to buy, every calculator gives you the answer in one click — with the math shown so you can double-check.
No signup, no popups, no email capture, no AI chatbot interrupting you. Just calculators that work, on any phone, on any connection. The calculators run entirely in your browser — your inputs never leave the page.
Built for both pros and homeowners
Every calculator gives you the headline answer (sheets, bundles, gallons, yards, BTUs) plus the supporting math so you can sanity-check the result. Technical inputs include plain-English tooltips for things like roof pitch, wire gauge (AWG), and R-value — useful if it's your first time spec'ing the job, ignored if you already know.
Common questions per calculator answer the things people actually search for: how much things cost, how to measure correctly, what to buy at Home Depot vs the lumber yard, and the rules of thumb pros use.