CalcWize is a treasury of 25 calculators spanning money and finance (budgets, loans, mortgage affordability, compound interest, retirement, tax, ROI, debt payoff, car buying, and more), currency and unit conversions, and everyday maths (percentages, age and dates, sales tax, BMI, calories, and a scientific calculator) — all built around one stubborn principle: your numbers stay yours. Every input you type lives only in your browser. There is no database to leak, no account to hack, no cookie to track you across other sites. You can browse them all by category.
What it's for
CalcWize helps you frame everyday financial and practical questions before you take them to a professional. Could I afford this house? How much would extra repayments save me? Am I on track for retirement? The calculators give you a starting point — a clear set of numbers you can take to a financial advisor, accountant, or mortgage broker for a real conversation.
What it's not for
CalcWize is not financial advice. The calculators use simplified assumptions, illustrative tax brackets, and indicative FX rates. They are designed to spark conversation, not replace it. For any consequential decision — buying a home, planning retirement, restructuring debt — speak with a qualified professional.
How the numbers are worked out
Every calculator uses standard, checkable formulas — the same amortisation, compound interest, and tax-bracket maths a professional would recognise — and each one shows its method and a last-reviewed date. The methodology page sets out the formulas, our review process, the sources we rely on, and the limits of what an estimate can tell you. For the ideas behind the tools, the guides explain them in plain English.
Bring your own AI
Every calculator has an optional AI Analysis panel. To use it, you bring your own API key from Anthropic (Claude), Google (Gemini), or OpenAI. CalcWize doesn't have a server-side AI key — that means we never burn your money, and your prompts go directly from your browser, through our routing endpoint, to the provider you chose. We don't store the prompt or the response.
Gemini has a generous free tier with no credit card required and is the recommended starting point.
Privacy
See the Privacy Policy for the full breakdown of what stays on your device and what doesn't.
Contact
Found a bug, have a feature request, or want to say hello?
hello@calcwize.app