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 refreshed annually against two public data sets:

• Remodeling Magazine's Cost vs. Value Report (published each spring since 1988) — national + 150-city medians across 23 common project scopes.
• HomeAdvisor's True Cost Guide — broader coverage of informal remodels and room-by-room scopes, based on user-reported job tickets.

When these sources disagree (and they sometimes do), we publish the mid-point and link out to both. Regional multipliers come from the Cost vs. Value regional roll-ups, normalised so the U.S. national average = 1.00.

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.