HomeToolDesk is an independent site with free calculators and plain-English guides for home projects, from sizing an air conditioner to choosing the right wire or buying the right amount of paint.

What you’ll find here

Free calculators. Quick tools that turn measurements into answers: how much material to buy, what size equipment you need, and what a project involves. They run in your browser, need no sign-up and don’t store what you type.

Practical guides. Clear explanations of electrical, heating and cooling, and DIY topics, written to help you plan a project and know when to bring in a professional.

How we work

• Our calculators use published formulas and widely used industry guidelines, and each page explains the method.
• We date every page and update it when standards or best practices change.
• Safety comes first. For electrical, gas and structural work, we point out when permits and licensed professionals are required.
• The site is funded by ads, as explained in our Advertising Disclosure. No company pays to be recommended.

Get in touch

Spotted an error or want a new calculator? Email tooldeskai@gmail.com or visit our contact page.