All seventeen calculators
- Mortgage CalculatorMonthly payment + full amortization schedule.
- Mortgage AffordabilityHow much can you borrow? Income multiple + stress test.
- Rental Yield CalculatorGross, net, and cash-on-cash returns for buy-to-let.
- Loan CalculatorPersonal, auto, or student loan payments and total interest.
- Compound Interest CalculatorFuture value of savings with monthly contributions.
- Retirement CalculatorProject your 401(k) / SIPP / IRA nest egg and safe income.
- Retirement DrawdownHow long will your pot last, or what's a safe withdrawal?
- ISA vs PensionUK tax-wrapper comparison after marginal-rate decisions.
- Net Worth TrackerAssets minus liabilities. Snapshots saved locally — no signup.
- Salary / Take-Home CalculatorNet pay after tax — Gibraltar, UK, Spain, US.
- CAGR / Investment ReturnCompound annual growth rate from start and end values.
- Debt Payoff (Snowball & Avalanche)Multi-debt payoff plan with strategy comparison.
- Savings Goal CalculatorSolve for monthly contribution, time, or final amount.
- Emergency Fund CalculatorHow much cash to stash for the unexpected, and how to get there.
- Tax Bracket CalculatorMarginal vs effective rate, per-band breakdown, bonus impact.
- Currency Converter20 major currencies, ECB reference rates, no hidden spreads.
- Inflation CalculatorFuture purchasing power + historical UK CPI value (1950 onward).
Why MoneyMath
Most online finance calculators are designed to capture leads for banks and brokers. MoneyMath isn't. There's no form to fill, no email to submit, no “get matched with a lender” button. You enter numbers, you see the answer, you read the explanation, you leave.
Every calculator on this site is built around three principles:
- Math you can audit. The formula is on the page. So is a worked example with real numbers.
- No advice, just arithmetic. We don't tell you what to do. We tell you what a number means.
- Fast and shareable. No JavaScript bloat. No popups. URLs you can bookmark.
Educational only — not financial advice
MoneyMath results are mathematical estimates. Real-world quotes from a bank, lender, or broker will differ — they include fees, insurance, tax treatments, and credit-based pricing that a general-purpose calculator can't know about. Always confirm with a qualified professional before acting on a number you see here.