About CalcShed
CalcShed is a free library of construction and trade calculators – concrete, asphalt, electrical, landscaping, and surface tools. I built it to do one thing well: give you accurate material and project estimates with the formula, the assumptions, and the sources shown, so you can check the math instead of trusting a black box.
Who Runs CalcShed
My name is Giorgi Gaprindashvili, and I am the founder and builder of CalcShed. I want to be straight about my role: I am not a contractor, electrician, or engineer. I am the person who designs, builds, and maintains the calculators and the site.
That is exactly why CalcShed works the way it does. Because accuracy cannot rest on my personal say-so, every calculator is built from published industry standards – ASTM and ACI for concrete, the NEC (NFPA 70) for electrical, AASHTO and NRCA references, and manufacturer technical data – and every tool shows the formula and assumptions it uses. You do not have to take my word for anything: you can see the source and the math, and override any default to match your own project, supplier, or local code.
Why I Built It
Most online calculators hand you a number with no explanation – no formula, no assumptions, no source. If the result is wrong, you have no way to know why. I kept hitting that problem and decided to build the opposite: calculators that show their work, run on both metric and imperial units, and let you adjust every assumption to fit your situation.
How I Keep the Calculators Accurate
Every calculator follows the same process: source the formula and default values from published standards, build the tool for both metric and imperial units, test it against independent references and edge cases, and document the assumptions on the page. When a standard changes or a user reports an issue, I update the tool and note when it was last updated. The full process is documented here:
- Editorial Policy – how calculators are developed, reviewed, and updated
- Methodology – formulas, defaults, and how conversions are verified
- Data Sources – the standards, codes, and references behind the numbers
CalcShed produces planning-grade estimates, not engineering calculations. For permit, structural, or load-bearing work, always confirm quantities and specifications with a licensed professional.
Connect
I am glad to hear from you – whether you have found an error, want to suggest a calculator, or just want to connect: