Contact us
Corrections are the most valuable mail we get. If a formula is wrong or a figure has drifted, we would rather hear it from you than leave it wrong.
Reach the editorial team at [email protected]. We read everything, and we reply to anything that identifies a genuine error.
What to include
A calculator looks wrong
Tell us which calculator, what you entered, what it returned, and what you expected. Formula errors get fixed first and fastest.
A guide is out of date
Prices drift, product availability changes, and regulations get updated. If something has gone stale, point us at the specific claim.
Something we should cover
If you went looking for a number and could not find it here, that is useful signal. Tell us what you were trying to work out.
What we can't help with
We are not a contractor and we do not provide quotes, site visits, or job referrals. We also cannot advise on what your local code requires, permit thresholds, fence heights, retaining wall engineering, and fertilizer restrictions vary by municipality, and your building department is the only reliable source.
For how our numbers are produced, including which constants are exact and which figures are typical ranges, see how we calculate.