Numbers that match the paperwork
Most free finance calculators round corners — they ignore the difference between a low monthly payment and a low total cost, or they show savings growth without the contributions that actually build it. These tools use the same amortisation and compounding formulas your bank uses: the loan and mortgage calculators solve for the exact instalment that clears the balance over the term and surface the total interest you pay, while the compound interest calculator layers regular contributions on top of compounding so you see both what you put in and what the growth adds.
How the calculators work together
Borrowing and saving are two sides of the same coin. Use the loan calculator to size a personal or car loan and see its true interest cost, the mortgage calculator to estimate the full PITI payment on a home, and the compound interest calculator to project what the money you are not spending on interest could grow into instead. Comparing the total interest on a loan against the future value of an investment is one of the clearest ways to decide whether to borrow, pay cash, or invest — each page links to the others so you can move between the questions quickly.
Estimates, not financial advice
Interest rates, lender fees, property taxes and tax treatment vary by bank, lender and country, and real investment returns fluctuate year to year. These calculators apply standard formulas to the figures you enter to give a clean planning baseline; they do not predict markets or replace a professional. Always confirm exact terms with your lender and consult a qualified adviser before borrowing or investing.