A cost of living budget calculator helps you list your household income and regular spending, then shows what may be left for essentials, savings or unexpected costs. Include less frequent expenses such as insurance, school costs, car repairs and Christmas spending by converting them into a monthly amount. Use the results as an estimate rather than a financial decision, and update them when your rent, energy bills or income changes. If your budget is short, check MoneyHelper for free guidance and GOV.UK to see whether you may qualify for benefits or other support.