CalcMyProject is a free set of material calculators for DIY and construction projects. No account, no paywall, no limits, and no data collected beyond standard anonymous analytics.
What we do
We answer one question well: how much material do I need to buy? Every calculator takes the measurements you can actually take with a tape measure and returns quantities in the units suppliers actually sell — bags, sheets, rolls, bundles, cubic yards, tons, pallets.
Each calculator sits alongside the reference material that makes the number usable: the formula it used, the coverage and yield figures behind it, the standard dimensions for that kind of work, the sequence of steps the job involves, and the mistakes that most often force a re-do.
How our numbers are built
Formulas come from published industry conventions and standard material yields, not from proprietary models. Every assumption we make — bag yields, coverage rates, waste allowances, rounding behaviour — is documented in full on the how we calculate page, along with the standards bodies each convention traces back to.
We publish that page for a specific reason: a calculator you cannot audit is a calculator you should not trust. If our figures differ from another source, you should be able to see exactly where and decide for yourself which is right for your job.
What this site is not
These are planning estimates, not engineering advice. They will not size a beam, verify a load path, or confirm that your project meets code where you live. Anything structural, and anything an inspector will sign off on, needs a qualified engineer or licensed contractor.
How we make money
Right now, we don't. There are no ads, no affiliate links, no sponsored placements, and nothing on this site earns a commission. Where we suggest a tool, it is a suggestion — not a paid placement, and not a link we profit from.
If that changes, we will say so plainly on this page and label any paid or affiliate link clearly at the point you see it, rather than burying the disclosure in a policy document.
Privacy
We use Google Analytics to understand which calculators get used and where people get stuck. We do not ask for your name, email, or any project details, and there is nothing to sign up for. The full detail is in our privacy policy.
Found an error?
Please tell us. A wrong coverage figure or a bad formula is the worst thing that can happen on a site like this, and we would much rather hear about it than not. When reporting, include the page and the specific number you think is wrong — and if you have a manufacturer figure or a standard that contradicts ours, that is exactly the kind of correction we act on fastest.
Using our calculators elsewhere
You are welcome to link to any calculator or reference any figure with attribution. Please don't scrape and republish the pages wholesale — see our terms of use.