About the Creator

Hi, I'm Luis Gonzalez.

I'm a web developer who enjoys turning complex construction math into simple, easy-to-use tools. I built Hammer Calculator so homeowners, DIYers, and contractors can get accurate material estimates without digging through spreadsheets or paying for an app.

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The Story

Why I built Hammer Calculator

It started with a simple frustration. Every time I needed to figure out how many bags of concrete to buy or how much lumber a deck frame required, I'd end up on a site cluttered with pop-ups or one that wanted me to download an app for a single calculation.

So I built my own. What began as a concrete calculator grew into a full library of over 200 tools spanning concrete, framing, roofing, plumbing, electrical, landscaping, and more. Each one is designed to give you a clear answer in seconds — no sign-ups, no paywalls, no clutter.

Every calculator includes the formulas and methodology behind the numbers. I believe that understanding how an estimate works helps you make better decisions on the job site. If you want to see the math, it's always there.

What You Can Do Here

Tools built for real projects

200+ Free Calculators

Get a quick, accurate estimate for any construction or home improvement project — concrete, roofing, flooring, painting, decks, fencing, plumbing, electrical, HVAC, landscaping, and more.

Learn How the Math Works

Every tool includes the formulas, methodology, and reference tables behind the calculation. No black boxes — understand the numbers so you can adjust for your specific project.

Built for Everyone

Whether you're a first-time homeowner buying materials for a weekend project or a general contractor putting together a client bid, these tools are designed to save you time and reduce waste.

A note on accuracy

All results are estimates based on standard industry formulas and material specifications. Real-world variables — site conditions, local building codes, material availability, and labor practices — can affect final quantities and costs. Always confirm estimates with a licensed professional before purchasing materials or beginning work.