About Renomath

Renomath is a planning-calculator site for home renovation projects. It exists because the two questions every homeowner asks at the start of a remodel — "is this even feasible?" and "is that bid fair?" — have ballpark-correct answers that don't require a pricey consultation. A good spreadsheet, honestly-sourced per-square-foot numbers, and a regional multiplier will get you 80% of the way there. That's what these calculators are.

What we do

• Free, no-login calculators for kitchen, bath, basement, addition, and whole-home remodels.
• Transparent math — every calculator shows its formula and cites its sources inline.
• No contractor-lead forms, no affiliate referrals, no phone tree.

Who runs it

Renomath is operated by a small editorial + engineering team that has been through their own remodels (first-hand: one gut kitchen, two bathroom redos, one basement finish, and a roof replacement across the team as of 2026). We're not licensed general contractors, and nothing on this site is a bid, a contract, or legal advice. The calculators are planning tools.

How we keep the numbers honest

Our per-square-foot baselines are benchmarked annually across multiple published cost guides:

• HomeGuide, Bob Vila, and This Old House cost guides — independently published national cost ranges across common remodel project scopes.

When these sources disagree (and they sometimes do), we publish the mid-point, with the full per-project justification documented in our methodology. Location multipliers are derived from BLS OEWS May 2025 construction wages, normalised so the U.S. national average = 1.00. Full derivation lives at our editorial policy. Remodeling Magazine's Cost vs. Value Report is an industry reference we benchmark against, not a data source for our figures.

What we're not

• We're not a marketplace. We do not connect you with contractors.
• We're not a lender or a broker. We do not recommend financing products.
• We're not a replacement for a GC walk-through. A licensed contractor in your ZIP code will always beat a calculator for binding numbers.

Corrections + feedback

If you spot a number that looks wrong, a scope that's missing, or a broken link, email us at [email protected]. We read everything, and we update the data tables in place — the Editorial Policy page documents how.