Loan, Mortgage, Savings and Investment Calculators

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Repayments and total cost

The loan and mortgage calculators use the standard amortisation formula: a fixed monthly payment that covers the interest due and reduces the balance, with the split between the two shifting towards capital as the loan runs. Both show the monthly figure, the total repaid and the total interest, because the monthly figure on its own hides how much a longer term costs. Extending a mortgage from 25 to 35 years lowers each payment and raises the total interest by a startling amount, and seeing both numbers side by side is the point.

Compounding

Compound interest depends on frequency as much as rate. Five percent compounded monthly is worth more than five percent compounded annually, and the calculator lets you set the frequency explicitly rather than assuming one. It also accepts a regular contribution, so it works for a savings plan as well as a lump sum, and shows the balance year by year so you can see where growth starts to outpace deposits.

Savings goals and returns

The savings goal calculator runs the compounding formula backwards: given a target, a starting balance, a rate and a deadline, it solves for the weekly, fortnightly or monthly contribution that lands on the target, and shows how the figure falls as the term stretches. The ROI calculator uses one definition, net gain divided by cost, and turns it into an annualised rate when you enter the years held so that returns over different periods can be compared. For a business rather than an investment, the break-even calculator in the business section shows the sales needed to cover fixed costs at a given margin.

Salary conversions

Salary-to-hourly divides an annual figure by the hours you actually work — the working week and weeks per year are inputs, not assumptions, because a 35-hour week with six weeks' holiday and a 40-hour week with four give very different hourly rates from the same salary. The pro-rata calculator does the reverse for part-time roles: given a full-time salary and the fraction of hours worked, it shows the annual, monthly and weekly equivalents.

Currency

The currency converter uses daily reference rates fetched once by the site and cached, so the conversion happens on your device without your figures being sent anywhere. The rate and its date are shown alongside the result; for a large transfer, expect the rate your bank offers to differ by its margin.

Estimates, not quotes

These tools use published formulas and stated assumptions. A lender adds fees, applies its own rounding, and may price differently by loan-to-value; a payroll department applies tax and pension deductions. Use the calculators to understand a quote and to compare options, not as a replacement for the figure on the paperwork.