QuantoObra is a set of material calculators and a quote maker for painters, concrete crews, tilers, drywallers, flooring installers and serious DIYers. We built it because most online calculators are slow, buried in ads, hide their formulas — or quietly send your data somewhere.
Our principles
- Accurate: formulas based on manufacturer coverage charts and the rules of thumb used on real job sites. Every calculator shows its working.
- Local: product sizes, units, currency and terms match how materials are sold where you work.
- Private: calculations run in your browser. No ads and no tracking cookies.
- Fast: loads in a blink, works offline and is designed for a phone in one hand.
- Honest: the free version is complete. Pro adds tools for people who estimate every day.
Found a mistake?
If a result doesn't match your experience on site, we want to know. Email support@quantoobra.com with the inputs you used.
Results are estimates. Always confirm quantities with your supplier and follow local building codes.