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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