Editorial Standards
This page explains how we build the calculators, where our figures come from, and how we keep the content accurate. We publish these standards so readers can judge the site for themselves.
How we build the calculators
Each tool uses standard geometric formulas, such as length times width times thickness for a slab, or pi times the radius squared times the height for a round column. All inputs are converted to a common unit before the math runs, and results are shown in cubic yards and cubic meters, with bag counts based on published bag yields.
Where our figures come from
We rely on recognized, named sources rather than guesswork:
- Manufacturer data sheets, such as the Quikrete Concrete Mix sheet, for bag yields, water and strength
- The American Concrete Institute and ASTM for mix, strength and material standards
- The Portland Cement Association for curing and concrete basics
- Building code references, such as the International Residential Code, for footing and frost guidance
Where a figure can change, such as material prices, we describe it as a range and point you to a current local quote.
Review and updates
We review the calculators and the content on a regular schedule and after any change to a standard or a product figure. Each page carries a last reviewed date so you can see how current it is.
Accuracy and corrections
We aim to be factual and clear. If you find an error in a formula, a figure or a reference, tell us through the Contact page and we will check it and correct it. We note significant corrections on the affected page.
Our limits
Our tools give estimates for planning, not professional engineering advice. For structural work, confirm with a licensed professional and your local building department. See the Disclaimer.
Authorship
Content is written and maintained by named people with real construction or engineering experience. We do not publish anonymous technical content, and we do not claim credentials we do not hold. Learn more on our About page.