About Lending Calculator

Who runs it

The site is built and maintained by Pond Software, an independent studio that publishes free, no-login calculators for everyday financial and household decisions. There is no sales team, no lead-generation funnel, and no lender paying to be recommended. We don't originate loans, broker mortgages, or sell your information to anyone who does — the whole site is just the math and the explanation behind it.

What the site does

Every calculator here starts from the standard amortization formula and shows its work: the monthly principal-and-interest payment, the full month-by-month schedule, and how much interest you actually pay over the life of the loan. From there we branch into the questions borrowers really ask — how much house you can afford, whether extra payments are worth it, when PMI drops off, and how a refinance pencils out once you count closing costs.

The guides exist for the same reason: to turn mortgage vocabulary into numbers. If you've ever wondered what the difference between APR and your interest rate costs you, or wanted every term defined in one place, the mortgage glossary links each definition straight to the tool that puts a number on it.

Our editorial approach

• Math over marketing. Calculators use published formulas — standard amortization, LTV, DTI — not proprietary "scores." When a result depends on an assumption, we tell you the assumption.
• No invented statistics. We don't quote rates, prices, or figures we can't point to. Loan limits and similar reference numbers are taken from the official source and dated.
• Estimates, not advice. Everything here is for information and planning. It isn't financial, tax, or legal advice, and it can't see your full situation the way a licensed professional can. See our terms of use for the full disclaimer.
• Honest about money. The site is free to use. Some pages include Amazon affiliate links to books we think are genuinely useful, disclosed on our affiliate disclosure page. How we handle data is spelled out in the privacy policy.

Get in touch

Found a bug, disagree with a number, or want a calculator we don't have yet? That feedback is how the site gets better — head to the contact page and send it over.