LEARN THE NUMBERS

Calculator guides

Clear formulas, worked examples and practical explanations for everyday calculations.

How to calculate loan paymentsMonthly payment formula with interest and term.Read guide How compound interest worksUnderstand long-term growth and compounding.Read guide How to calculate percentages and discountsPercentage, change and discount formulas.Read guide How to calculate fuel costEstimate fuel use and total trip cost.Read guide How to calculate VATAdd or remove VAT correctly.Read guide

Use the guides with confidence

Each guide explains the inputs, formula and units behind a calculator before showing a worked example. Start with the explanation when you need to check a result, compare two methods or understand why changing one input changes the total. The examples use fixed figures for clarity; replace them with current values from your own document, provider or local market.

Estimates and current information

Rates, taxes, prices and official rules can change after publication. Calculator results are planning aids rather than binding quotations or professional advice. For decisions involving money, tax or legal obligations, confirm the current figure with the responsible institution or a qualified professional.