About TrueSquare

TrueSquare is a free collection of home improvement and construction calculators for people planning real projects — homeowners, DIYers and anyone who wants to check a quote. We currently publish 17 calculators covering concrete, landscaping, flooring and tile, roofing and carpentry.

How we build calculators

• Documented formulas. Every calculator page shows the exact formula, a worked example and the assumptions behind it.
• Tested code. Calculation logic is separated from the interface and covered by automated tests, including unit conversions, rounding and invalid inputs.
• Exact unit conversions. Imperial–metric conversions use the exact definitions published by NIST (1 in = 25.4 mm, 1 lb = 0.45359237 kg).
• No invented product data. Where a result depends on a product — bag yield, density, coverage per box — you can enter the value from your product, and any typical value we use is labelled as such.
• Estimates, not engineering. We calculate quantities. We do not size structures or replace professional advice or local building codes.

Who is behind the site

TrueSquare is an independent project operated by Izam Montilla Gómez, an individual based in Barcelona, Spain. We do not claim professional engineering or trade credentials. Instead, every formula is documented, sourced and tested so you can check the work yourself.

How the site is funded

The calculators are free. The site is supported by advertising served through Google AdSense, shown in clearly separated spaces and never inside a calculator, and may in future include affiliate links and optional paid templates. Commercial relationships will never change how a calculator works or what it recommends. See our affiliate disclosure and privacy policy.

Found a mistake?

Accuracy matters more to us than anything else. If you think a result, formula or explanation is wrong, please contact us with the calculator name and the values you entered.