About ProjectKit

Why this exists

Most home projects stall in the same place: you know what you want to build, but you have no idea what to buy or what it will cost. A calculator gives you a volume. It does not tell you that concrete is sold by the quarter yard, that flooring comes in whole boxes, or that the form stakes and the expansion joint are the things you will forget.

ProjectKit starts from the project rather than the equation. You describe what you are building, and it works out quantities with a waste allowance, rounds them to what you can actually purchase, prices them, builds a shopping list, and lays out the order of operations. Then it hands you a document you can print or take to the store.

How the numbers are produced

Every number comes from plain, tested arithmetic in the application — not from a language model. The calculations are unit-tested, including the packaging and rounding rules, and each result page shows the exact formulas used alongside the planning assumptions applied.

Where the answer depends on a convention rather than a measurement — a waste percentage, a bag yield, a coverage rate — that assumption is shown to you and can be changed. Prices are national ballpark planning figures you can overwrite with your own; they are not live retail prices and ProjectKit does not claim they are.

AI is used in one place only: reading your plain-English description and proposing which planner to open and which measurements you mentioned. It never calculates anything, and you see and can correct every value before it is used.

What ProjectKit is not

• It is not structural engineering. Spans, footings, loads, and code compliance are outside what a material estimator can responsibly answer.
• It is not a quote. Material costs vary by region, supplier, season, and grade.
• It is not a substitute for your local building department. Permits and code requirements differ everywhere.
• It is not a contractor marketplace, and it does not sell your details to one.

ProjectKit is in beta

The site works and the estimates are tested, but the planning assumptions behind them — coverage rates, waste allowances, package sizes — are still being checked against real projects and real receipts. Where we found one wrong, we fixed it and wrote down where the corrected figure came from.

So treat the numbers as a well-researched starting point rather than a final answer, and do what you would do anyway: check the critical ones against the product you actually buy. If something looks off, the “Does this estimate look wrong?” link under every result is the fastest way to tell us, and it is read.

Privacy in one paragraph

There are no accounts. Your projects are saved in your own browser, not on a server. See the privacy policy for the full picture.

Get in touch

Found a calculation that looks wrong, or a project we should add? Tell us — calculation correctness is the thing we care about most.