MoneyMaths.
MoneyMaths · Practical guide

Practical money guides

Worked examples that help you use the calculators and understand the trade-offs.

Start with the question you are trying to answer. Each guide explains a calculation, shows a worked example and links to a tool for your own numbers. Examples are hypothetical; product terms and personal circumstances can differ.

Why Your Monthly Budget Breaks: Plan for Irregular Bills

Build a monthly budget that includes annual bills, uneven income and a realistic savings amount, with a complete worked example.

How to Calculate an Emergency Fund Target You Can Explain

Estimate emergency savings from essential expenses and a chosen time period, then work out the monthly deposit needed to build it.

Your Savings Grew—But Can They Buy More?

Understand the difference between a rising savings balance and purchasing power, with exact inflation-adjusted examples.

Why an Investment Calculator Is a Scenario, Not a Forecast

Learn what constant-return projections include, what they omit and how to compare assumptions without mistaking them for promises.

A smaller loan payment can cost you more

Compare the monthly commitment, total interest and fees before choosing a loan.

Monthly Extra Payments vs a Lump Sum: Worked Example

Compare extra loan payments using a $100,000 loan at 6%. See payoff months, interest saved and why the timing and total amounts matter.

Net Worth vs Available Cash: Why Both Numbers Matter

Calculate assets minus debts, then distinguish long-term wealth from the money available to pay near-term bills.

Salary to Hourly Pay: Paid Leave, Unpaid Weeks and Take-Home Pay

Compare salary and hourly pay consistently, including paid leave, working weeks and the limits of a gross-pay conversion.

How to Save $10,000 in a Year: Monthly Savings Examples

Work out the monthly saving needed for $10,000, starting from zero or existing savings. Compare a one-year deadline with 18 or 24 months.

Change the deadline, change the monthly saving

Use a target date and a realistic monthly contribution to build a savings plan.

Why making a payment may not reduce your debt

Understand interest coverage, a fixed repayment budget and the difference between payoff methods.

Read our editorial and corrections policy.