About PennyWise Calcs

PennyWise Calcs provides free personal finance calculators with one difference from most of the internet: we show our work. Every calculator page explains the formula it uses, the assumptions behind the defaults, and the honest limitations of the result.

Our Standards

• Transparent math. The formula for every calculation is printed on the page. If we cannot explain it, we do not publish it.
• Conservative defaults. Where a default assumption is required, we choose realistic mid-range values rather than optimistic ones.
• No data collection. All calculations run locally in your browser. Nothing you type is sent anywhere.
• No fake precision. Financial projections over decades are estimates, not promises. We say so on every page.

What We Are Not

Nothing on this site is financial advice. Calculators are educational tools that show the arithmetic consequences of assumptions you choose. For decisions involving large sums, taxes, or legal obligations, consult a qualified professional who knows your full situation.

Contact

Found a bug or a number that looks wrong? We fix errors fast and credit reports. Reach us at contact@pennywisecalcs.com (placeholder until our mailbox is live).