Home › About
About MaterialCalc
MaterialCalc is a small independent site that answers one question: how much material do I need to buy?
Who runs it
MaterialCalc is built and maintained by Jay Hao. It started because most material calculators either bury the answer under ads or ask for an email before showing a number. These are free, need no account, and update as you type.
How the numbers are worked out
Every tool uses a fixed formula, printed on the page. The same code runs in your browser and in the build that produces the worked examples, so the answer box and the tables cannot disagree.
Bag yields come from manufacturer published figures: 0.60 ft³ for an 80 lb bag, 0.45 ft³ for 60 lb and 0.30 ft³ for 40 lb. Coverage rates for paint, mulch, gravel, drywall and tile are typical values from product data, not guarantees. Your product may differ, so check the label.
Cost figures are US averages for budgeting. They exclude tax, delivery outside the quoted rate, permits and labour unless a range is labelled installed. They are a starting point for calling a supplier, not a quote.
What we do not do
- No account, email address or signup is required.
- Measurements you type are not sent to us. The calculators run on your device. The privacy policy explains the one analytics tool the site uses.
- We do not sell calculator inputs or personal information.
Corrections
If a number looks wrong, or a local price is far outside the range shown, tell us and include the page and the figures you entered. Pages are reviewed when formulas, material yields or prices change. Last reviewed: 21 October 2026.