How the maths works.
Formula-first guides that support the main calculators. Read the method, move into the calculator, and keep the important pages in the same topical cluster one or two clicks apart.
Priority clusters: mortgages, savings, compound interest, repayment, overpayment, offset, salary, retirement, and risk.
Mortgage Planning Cluster
Use this hub to move from the core repayment formula into affordability, offset, overpayment, and rent-versus-buy comparisons without leaving the mortgage cluster.
Mortgage RepaymentMonthly payment, total interest, and full cost over any term.Mortgage AffordabilityThe maximum you can borrow based on income, deposit, and stress test.Offset MortgageHow savings reduce mortgage interest and shorten your term.Mortgage OverpaymentInterest saved and years removed by paying extra each month.
Sub-Hubs
Use these short organiser pages when you want the strongest pages in this cluster grouped by job rather than listed in a flat directory.
How Mortgage Repayment Calculations WorkUnderstand the amortisation formula behind monthly mortgage payments.How Mortgage Affordability Is AssessedSee how income multiples, outgoings, and stress tests shape borrowing power.How Offset Mortgages Actually WorkCompare offset savings against standard mortgage interest charges.Mortgage Overpayment: How Much Does It Save?Measure how extra payments reduce lifetime interest and term length.Rent vs Buy: The Key Numbers to CompareKeep tenure and break-even reasoning inside the same housing cluster as repayment and affordability.LISA vs Help to Buy ISA: When the Government Bonus Actually HelpsAdd deposit-bonus and first-time buyer saving rules to the main mortgage decision path.
Savings and Compounding Cluster
This cluster connects savings growth, compounding, savings goals, retirement projections, and emergency-fund planning so users can move from formula to decision path quickly.
Savings GrowthHow compound interest grows your savings with regular contributions.Compound InterestHow compounding frequency affects your effective annual rate.Save for a GoalHow long to reach a target, or what monthly saving hits a deadline.Retirement SavingsProject your pension pot, including employer contributions and inflation.
Sub-Hubs
Use these short organiser pages when you want the strongest pages in this cluster grouped by job rather than listed in a flat directory.
Open the savings calculators hubStart with the main savings category hub for growth, goals, resilience, and recurring-cost trade-offs.Open the savings and compound hubGroup growth, goal, retirement, and emergency-fund pages under one savings path.Open the overpayment and offset hubUse the adjacent mortgage strategy hub when a cash question becomes a borrowing question.
Understanding Compound InterestLearn how frequency and effective annual rate change the outcome.Save for a Goal: Time and Amount BasicsTranslate a target amount and deadline into a monthly savings number.How Retirement Savings Projections WorkSee how recurring contributions and inflation affect long-term projections.Emergency Fund: How Much Is Enough?Set a buffer size that matches expenses and income stability.Subscription Drain: The True Long-Term CostReframe recurring spending as cumulative cost and foregone growth.Retirement Savings: Employer Contributions and Inflation ImpactKeep matched contributions and real-value retirement framing inside the main savings cluster.How to Calculate Your Financial RunwayLink emergency savings and burn-rate logic directly back to the broader savings plan.
Income, Tax, and Borrowing Cluster
These pages work best as a connected cluster: calculate take-home pay, convert salary to freelance pricing, then pressure-test borrowing and repayment assumptions.
Salary Take-HomeNet pay after tax — UK, Germany, USA, France, Netherlands, Australia.Freelance Rate CalculatorWork backwards from desired salary to minimum hourly and day rate.Loan RepaymentMonthly repayments and true APR on any loan or credit agreement.Mortgage AffordabilityThe maximum you can borrow based on income, deposit, and stress test.
Sub-Hubs
Use these short organiser pages when you want the strongest pages in this cluster grouped by job rather than listed in a flat directory.
Open the full calculators directoryReturn to the main calculator directory when the question crosses salary, borrowing, and savings categories.Open the income, tax, and borrowing hubKeep salary, freelance, loan, and affordability pages grouped within one commercial cluster.Open the property, tax, and estate hubUse the adjacent planning hub when income questions turn into tax-aware property or wealth decisions.
How Salary Take-Home Is CalculatedBreak down gross-to-net pay across tax and social contribution systems.Salary Sacrifice: Tax and National Insurance Savings ExplainedSee when pension and benefit salary sacrifice changes take-home outcomes.Freelance Rate: Working Backwards from Desired SalaryConvert target income into billable day-rate requirements.Loan Repayment: True APR ExplainedUnderstand repayment schedules, APR, and total borrowing cost.Student Loan Repayment: Plan 1, Plan 2, and Plan 5 ComparedKeep graduate repayment deductions in the same income-to-borrowing path as salary and loan pages.
Risk and Coverage Cluster
Professional users usually need to move between exposure sizing, limit adequacy, and scenario modelling. This cluster keeps those supporting paths shallow and crawlable.
Business Interruption Sum InsuredCalculate BI sum insured using gross profit, trend uplift, indemnity period, and ICOW.Coverage Gap AnalysisMap policy limits against exposures across property, liability, BI, and cyber lines.Total Cost of Risk (TCOR)Aggregate premiums, retained losses, admin, and risk control costs. Four scenario comparison.Risk Score & Heat MapScore risks by likelihood and impact. 5×5 heat map, editable register.
Sub-Hubs
Use these short organiser pages when you want the strongest pages in this cluster grouped by job rather than listed in a flat directory.
Business Interruption Sum Insured: How It WorksWork through BI sum-insured logic and indemnity-period sizing.Human Life Value: How Income Replacement Maths WorksKeep protection-gap and income-replacement framing attached to the broader coverage cluster.Cyber-Resilient Agency: Protecting Client DataConnect breach exposure to control investment and coverage planning.Cyber Insurance Limits: How Adequacy Is EstimatedKeep cyber-limit adequacy and the supporting exposure logic inside the same protection path.Coverage Gap Analysis: Comparing Limits to Real ExposureCompare policy limits to actual exposures before relying on headline sums insured.Total Cost of Risk: What TCOR Actually MeasuresTie retained losses, premiums, and control spending back to the rest of the risk toolset.Risk Heat Maps: Likelihood, Impact, and Their LimitsSupport register scoring and prioritisation with a clearer explainer on likelihood and impact.Loss Event Probability: Expected Loss and Scenario WeightingKeep expected-loss and scenario-weighting logic close to register and coverage work.Solvency Capital Requirement: Standard Formula BasicsAdd capital framing where retained risk needs to be translated into solvency language.RegTech Essentials: Automating ComplianceModel compliance cost, efficiency, and automation ROI.Private Credit Playbook: Diversifying Beyond EquitiesUse adjacent portfolio-risk content to support deeper professional research.Parametric Insurance: Instant-Payout Weather TriggersAdd trigger-based cover design and basis-risk framing to the professional risk cluster.LTV to CAC: How Customer Economics Are Actually CalculatedRetain one economics explainer where risk work overlaps with acquisition cost and portfolio value models.
Energy and Lifestyle Cluster
TDEE sits outside the money clusters, but the page still benefits from direct links into the explanatory guide and a small surrounding support path.
TDEE & Calorie CalculatorTotal daily energy expenditure, BMR, BMI, and macro targets.Subscription DrainTrue 10-year cost of subscriptions and investment opportunity cost.Lifestyle Inflation TrackerCompare current vs entry-level spending and the 10-year opportunity cost.
Sub-Hubs
Use these short organiser pages when you want the strongest pages in this cluster grouped by job rather than listed in a flat directory.
TDEE and Calorie Needs: How the Calculation WorksUnderstand the BMR and activity formulas behind calorie estimates.Subscription Drain: The True Long-Term CostCompare recurring lifestyle costs with longer-term opportunity cost.Lifestyle Inflation: Real Cost Over TimeKeep small spending upgrades and their long-run savings drag inside the same support cluster.How to Calculate Your Financial RunwayTie resilience, runway, and emergency planning back to recurring-cost decisions.Financial Crisis Simulator: How Long Will Savings Last?Keep the scenario-based runway explainer alongside the broader lifestyle and resilience support pages.
Property, Tax, and Estate Cluster
These pages support housing and wealth-transfer decisions that sit between personal finance calculators and higher-stakes planning topics. The cluster groups property yield, tax, and estate explainers so they are not left as isolated articles.
Rent vs BuyLong-term financial outcome of renting against buying.Mortgage RepaymentMonthly payment, total interest, and full cost over any term.Salary Take-HomeNet pay after tax — UK, Germany, USA, France, Netherlands, Australia.Retirement SavingsProject your pension pot, including employer contributions and inflation.
Sub-Hubs
Use these short organiser pages when you want the strongest pages in this cluster grouped by job rather than listed in a flat directory.
Rent vs Buy: The Key Numbers to CompareKeep the tenure decision explainer inside the same housing, property, and wealth-transfer cluster.Buy-to-Let Yield: Gross, Net, and Cash-on-Cash ReturnKeep property-return definitions close to the broader housing and savings cluster.Capital Gains Tax: How the Calculation Works (2025/26)Tie disposal and gain mechanics back to the main tax-aware calculator paths.Inheritance Tax: Nil-Rate Band, Taper Relief, and How It Is CalculatedKeep estate tax and gifting rules within reach of retirement and long-term wealth pages.LISA vs Help to Buy ISA: When the Government Bonus Actually HelpsSupport first-time buyer and deposit-planning journeys with a clear savings-rule explainer.Pension Drawdown: Sustainable Withdrawal Rates ExplainedConnect estate and transfer questions to the retirement-income decisions that often follow.
Markets, Investing, and Cross-Border Money Cluster
This cluster holds the more specialised investing, FX, and market-context explainers that support compound-growth and tax journeys without diluting the core calculator pages.
Compound InterestHow compounding frequency affects your effective annual rate.Savings GrowthHow compound interest grows your savings with regular contributions.Retirement SavingsProject your pension pot, including employer contributions and inflation.Salary Take-HomeNet pay after tax — UK, Germany, USA, France, Netherlands, Australia.
Sub-Hubs
Use these short organiser pages when you want the strongest pages in this cluster grouped by job rather than listed in a flat directory.
Currency Exchange: The Real Cost of FX Fees and SpreadKeep cross-border payment costs close to savings and return comparisons.Dividend Yield vs Growth Investing: Total Return ComparisonConnect income versus growth framing back to the main compounding cluster.Market Forecasts: Impact of Rate Cuts and GeopoliticsProvide market-context support for users comparing scenarios rather than looking for predictions.Tax-Loss Harvesting Strategies for Volatile MarketsKeep after-tax portfolio mechanics attached to the broader tax and investing pathway.Private Credit Playbook: Diversifying Beyond EquitiesAdd one higher-yield professional investing explainer to the same long-term return cluster.Capital Gains Tax: How the Calculation Works (2025/26)Keep disposal and after-tax proceeds close to the investing and return-comparison path.
Advisory Strategy and Automation Cluster
These guides support the professional side of the site where workflow automation, client analytics, and advisory economics matter more than a single calculator output. The cluster keeps those pages discoverable without forcing them into the risk register bucket.
LTV & CAC CalculatorCustomer Lifetime Value, CAC ratio, and payback period. DCF-based LTV with scenario modelling.Loss Event Probability ModelerExpected annual loss from risk events using triangular distributions.Cyber Risk ExposureEstimate breach costs, risk score, and recommended cover limit based on security controls.Total Cost of Risk (TCOR)Aggregate premiums, retained losses, admin, and risk control costs. Four scenario comparison.
Sub-Hubs
Use these short organiser pages when you want the strongest pages in this cluster grouped by job rather than listed in a flat directory.
The Agentic Advisor: AI-Driven Digital Co-WorkersConnect AI workflow delegation to measurable advisory-unit economics.Automation Audit: Tasks to Delegate to AI in 2026Map operational tasks into automation candidates and payback logic.Beyond Chatbots: Predictive Analytics for Portfolio ReviewsKeep model-driven portfolio review thinking inside the professional strategy cluster.Digital Client Experience: Phygital Engagement PlatformsTie service-delivery economics and adoption risk back to the adjacent commercial tools.Inheritance Pivot: Onboarding Heirs as ClientsKeep client-transition and conversion economics grouped with advisory growth explainers.Multi-Generational Bridge: Retaining Assets Across GenerationsSupport longer-horizon retention and wealth-transfer economics within the same strategy cluster.
Core Guides
16 guides
These are the evergreen explainer pages most closely tied to the main calculator hubs and the highest-intent finance topics.
Advanced and Professional Guides
12 guides
These pages support the professional tool clusters and adjacent strategic searches without breaking the formula-first site style.
Current-Year Money Questions
12 guides
These guides answer narrower tax, salary, retirement, and property questions that often sit one step before calculator use.
Trust and Standards
Supporting documents that explain formula choices, source freshness, editorial boundaries, and review standards.
Search-Specific Explainers
Narrow pages built for specific calculator-intent queries. These extensions reinforce the formula-first position and link directly into the relevant tools.
36 extensions
Mortgage Payment Examples: How Rate, Term, and Principal Change the NumberWorked mortgage examples for common loan sizes, rates, and terms. Formula-first explanations only, with direct links back to the repayment calculator.Mortgage Repayment CalculatorMortgage Rate vs Term: Which Changes the Cost More?A formula-first guide to the two biggest mortgage levers: interest rate and loan term. Shows why the payment and the lifetime cost can move in different directions.Mortgage Repayment CalculatorCompound Interest by Frequency: Annual, Quarterly, Monthly, and DailyHow compounding frequency changes the final balance, why EAR differs from the headline rate, and when the difference is material enough to care about.Compound Interest CalculatorSimple vs Compound Interest: Same Rate, Very Different OutcomeA practical guide to the difference between linear and compounding growth, including where each model appears in real savings, loans, and projections.Compound Interest CalculatorLoan APR vs Interest Rate: Why the Sticker Rate Can MisleadExplains the difference between the stated loan rate and the effective annual cost once repayment structure and fees are included.Loan Repayment CalculatorRetirement Pot Targets: Working Backwards from Monthly IncomeA formula-first guide to converting a target monthly retirement income into an approximate portfolio size, contribution path, and time requirement.Retirement Savings CalculatorSalary Bonus Take-Home: Why a Bonus Never Lands as the Headline NumberA guide to the mechanics behind bonus taxation and why gross bonus figures translate into lower net cash across different tax systems.Salary Take-Home CalculatorOffset vs Overpayment: Two Ways to Cut Mortgage InterestCompares the maths of offset savings and regular overpayments, focusing on interest saved, flexibility, and term reduction rather than product marketing.Offset Mortgage CalculatorSavings Goal Deadline Maths: What Monthly Number Actually Hits the Target?Shows how target amount, current savings, return assumption, and deadline interact when users search for the monthly saving needed to hit a goal.Save for a Goal CalculatorSubscription Opportunity Cost: What a Small Monthly Spend Turns Into Over TimeA formula-first extension for recurring-cost searches, showing how modest subscriptions scale into larger multi-year totals and foregone investment value.Subscription Drain CalculatorFreelance Day Rate from Salary: Translating Employed Income into Contract PricingA formula-first guide to converting salaried compensation into a freelance or contractor day rate once utilisation, taxes, and overheads are made explicit.Freelance Rate CalculatorSavings Growth: How Regular Contributions Compound Over TimeA formula-first explainer for savings growth projections, covering starting balances, monthly additions, rates, and the split between contributions and earned interest.Savings Growth CalculatorHuman Life Value: How Income Replacement Maths WorksExplains how human life value models convert future earnings, obligations, and discount rates into a present-value insurance benchmark.Human Life Value CalculatorTotal Cost of Risk: What TCOR Actually MeasuresA formula-first guide to total cost of risk, showing how premiums, retained losses, administration, and control spend combine into a single risk-cost view.Total Cost of Risk CalculatorRisk Heat Maps: Likelihood, Impact, and Their LimitsExplains how 5x5 risk heat maps are built, what the scoring means, and why the visual should support rather than replace underlying probability thinking.Risk Heat Map CalculatorSolvency Capital Requirement: Standard Formula BasicsA plain-language explainer of how standard-formula SCR thinking combines risk modules, diversification, and capital charges into a solvency benchmark.SCR EstimatorCoverage Gap Analysis: Comparing Limits to Real ExposureShows how coverage-gap analysis compares policy limits, sublimits, and retained losses against the exposure they are meant to absorb.Coverage Gap Analysis CalculatorLTV to CAC: How Customer Economics Are Actually CalculatedExplains customer lifetime value, acquisition cost, gross-margin adjustment, and payback period so users can read LTV:CAC ratios correctly.LTV & CAC CalculatorLoss Event Probability: Expected Loss and Scenario WeightingA formula-first guide to loss-event probability, expected annual loss, and why severity assumptions matter as much as likelihood assumptions.Loss Event Probability ModelerCyber Insurance Limits: How Adequacy Is EstimatedExplains how cyber-limit estimates combine revenue, records, dependency risk, and control strength to frame whether a limit is thin, adequate, or excessive.Cyber Insurance Limit CalculatorGBP300,000 Mortgage at 5% for 25 Years: Payment ExampleWorked repayment example for a GBP300,000 mortgage at 5% over 25 years, including monthly payment, total interest, and why the early schedule is interest-heavy.Mortgage Repayment CalculatorGBP400,000 Mortgage at 4.5% for 30 Years: Payment ExampleWorked example for a GBP400,000 repayment mortgage at 4.5% over 30 years, designed for users comparing larger loans and longer terms.Mortgage Repayment CalculatorHow Much House Can I Afford on a GBP60,000 Salary?Explains the affordability maths behind a GBP60,000 salary, including income multiples, stress testing, and the role of deposit size in the final home-price range.Mortgage Affordability CalculatorHow Much House Can I Afford on GBP60,000 with a GBP50,000 Deposit?A deposit-specific affordability example showing how a GBP50,000 deposit changes LTV, borrowing range, and monthly repayment options for a GBP60,000 salary.Mortgage Affordability CalculatorGBP40,000 Salary After Tax in the UK: Net Pay ExampleWorked UK take-home example for a GBP40,000 salary, showing how income tax, National Insurance, pension deductions, and pay frequency shape net pay.Salary Take-Home CalculatorGBP60,000 Salary After Tax in Scotland: Net Pay ExampleWorked Scottish take-home example for a GBP60,000 salary, highlighting how Scottish income-tax bands change the net outcome versus the rest of the UK.Salary Take-Home CalculatorEUR70,000 Salary After Tax in Germany: Net Pay ExampleWorked German gross-to-net example for a EUR70,000 salary, showing income tax and social insurance effects on net pay.Salary Take-Home Calculator5% Employee + 5% Employer Pension on an GBP80,000 SalaryWorked pension-contribution example showing how an 80,000 salary with 5% employee and 5% employer contributions compounds over time and affects take-home pay.Retirement Savings CalculatorHow to Build a 6-Month Emergency Fund on GBP2,500 Monthly ExpensesWorked emergency-fund example showing the target balance for 2,500 monthly expenses and how monthly savings rates change the timeline to full coverage.Financial Crisis SimulatorGBP10,000 Invested at 7% for 20 Years: Future Value ExampleWorked future-value example showing what 10,000 growing at 7% for 20 years becomes, and how additional monthly contributions would change the path.Compound Interest CalculatorNet Worth Growth: How Saving, Returns, and Inflation InteractA formula-first explainer for net-worth projections, showing how starting wealth, monthly savings, market returns, and inflation shape long-run outcomes.Savings Growth CalculatorDebt Payoff Strategy: Timeline, Interest, and Extra Payment MathsExplains how debt-payoff timelines react to APR, minimum payments, and extra monthly overpayments, with a focus on arithmetic rather than payoff ideology.Loan Repayment CalculatorEmergency Fund Timeline: How Long to Build the BufferA formula-first explainer for emergency-fund timelines, focused on the saving rate, existing balance, and interest assumptions that determine how fast the target is reached.Financial Crisis SimulatorPension Contribution Scenarios: Comparing Employee and Employer RatesExplains how different employee and employer contribution combinations change pension funding, future pot size, and current pay impact.Retirement Savings CalculatorHow Much House Can I Afford? The Core Maths Behind the QuestionA broader affordability explainer covering salary, debts, deposit, rate, tax, and insurance assumptions that shape home-price limits.Mortgage Affordability CalculatorSide Hustle Profit After Tax: What Actually Reaches YouExplains the arithmetic behind side-hustle profit after expenses and tax, helping users distinguish revenue from usable income.Freelance Rate Calculator
These guides explain how calculations work. They are not financial advice, tax advice, insurance advice, or investment recommendations.