Two-Factor Authentication Adoption ROI Calculator

ANA›Life Services Authority›National Calculator Authority›Two-Factor Authentication Adoption ROI Calculator

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Two-Factor Authentication Adoption ROI Calculator

Estimate the financial return on investment of deploying Two-Factor Authentication (2FA) by comparing implementation costs against the risk reduction value from prevented account compromises.

Number of Users / Employees

Annual Probability of Account Compromise Without 2FA (%)

Average Cost per Compromised Account (USD)

Risk Reduction from 2FA (%)

One-Time Implementation Cost (USD)

Annual 2FA License / Service Cost per User (USD)

Total Training & Onboarding Cost (USD)

Analysis Period (Years)

Calculate ROI

function twoCalc() { var errors = [];

var numUsers = parseFloat(document.getElementById('two-num-users').value); var breachProb = parseFloat(document.getElementById('two-breach-prob').value); var costPerBreach = parseFloat(document.getElementById('two-cost-per-breach').value); var riskReduction = parseFloat(document.getElementById('two-risk-reduction').value); var implCost = parseFloat(document.getElementById('two-impl-cost').value); var annualCostUser = parseFloat(document.getElementById('two-annual-cost-per-user').value); var trainingCost = parseFloat(document.getElementById('two-training-cost').value); var years = parseFloat(document.getElementById('two-years').value);

if (isNaN(numUsers) || numUsers 100) errors.push("Annual breach probability must be between 0.01% and 100%."); if (isNaN(costPerBreach) || costPerBreach 100) errors.push("Risk reduction must be between 1% and 100%."); if (isNaN(implCost) || implCost 20) errors.push("Analysis period must be between 1 and 20 years.");

var resultDiv = document.getElementById('two-result');

if (errors.length > 0) { resultDiv.style.display = 'block'; resultDiv.innerHTML = 'Please fix the following:' + errors.map(function(e){ return ''; }).join('') + ''; return; }

// ── Core Calculations ──────────────────────────────────────────────────────

// Annual Expected Loss WITHOUT 2FA // AEL_without = N × P_breach × C_breach var annualLossWithout = numUsers * (breachProb / 100) * costPerBreach;

// Annual Expected Loss WITH 2FA // AEL_with = AEL_without × (1 - RiskReduction%) var annualLossWith = annualLossWithout * (1 - riskReduction / 100);

// Annual Risk Savings (Annualised Loss Expectancy reduction) // ARS = AEL_without - AEL_with var annualRiskSavings = annualLossWithout - annualLossWith;

// Total Annual 2FA Operating Cost // TAOC = N × AnnualCostPerUser var totalAnnualOpCost = numUsers * annualCostUser;

// Total One-Time Costs // TOC = ImplCost + TrainingCost var totalOneTimeCost = implCost + trainingCost;

// Total Cost of 2FA over analysis period // TotalCost = TOC + (TAOC × Years) var totalCost = totalOneTimeCost + (totalAnnualOpCost * years);

// Total Risk Savings over analysis period // TotalSavings = ARS × Years var totalSavings = annualRiskSavings * years;

// Net Benefit // NetBenefit = TotalSavings - TotalCost var netBenefit = totalSavings - totalCost;

// ROI (%) // ROI = (NetBenefit / TotalCost) × 100 var roi = totalCost > 0 ? (netBenefit / totalCost) * 100 : Infinity;

// Payback Period (months) // Monthly net benefit = (ARS - TAOC) / 12 // Payback = TOC / (monthly net benefit) [only meaningful if monthly net > 0] var monthlyNetBenefit = (annualRiskSavings - totalAnnualOpCost) / 12; var paybackMonths = (monthlyNetBenefit > 0) ? (totalOneTimeCost / monthlyNetBenefit) : null;

// Cost per user per year (total) var costPerUserPerYear = totalCost / (numUsers * years);

// ── Format helpers ───────────────────────────────────────────────────────── function fmt(n) { if (!isFinite(n)) return "∞"; return n.toLocaleString('en-US', {minimumFractionDigits: 2, maximumFractionDigits: 2}); } function fmtInt(n) { return Math.round(n).toLocaleString('en-US'); }

var roiLabel = isFinite(roi) ? fmt(roi) + "%" : "∞ (zero cost scenario)"; var roiClass = netBenefit >= 0 ? "calc-positive" : "calc-negative"; var paybackStr = paybackMonths !== null ? (paybackMonths ' + 'MetricValue' + 'Annual Expected Loss Without 2FA$' + fmt(annualLossWithout) + '' + 'Annual Expected Loss With 2FA$' + fmt(annualLossWith) + '' + 'Annual Risk Savings (ALE Reduction)$' + fmt(annualRiskSavings) + '' + 'Total Annual Operating Cost (2FA)$' + fmt(totalAnnualOpCost) + '' + 'One-Time Costs (Impl. + Training)$' + fmt(totalOneTimeCost) + '' + 'Total 2FA Cost (' + years + ' yrs)$' + fmt(totalCost) + '' + 'Total Risk Savings (' + years + ' yrs)$' + fmt(totalSavings) + '' + 'Net Benefit (' + years + ' yrs)$' + fmt(netBenefit) + '' + 'ROI' + roiLabel + '' + 'Payback Period' + paybackStr + '' + 'Effective Cost per User per Year$' + fmt(costPerUserPerYear) + '' + '' +

'Interpretation: ' +
(netBenefit >= 0
? 'The 2FA investment is financially justified. For every $1 spent, you recover $' + fmt(1 + netBenefit / totalCost) + ' in risk-adjusted value.'
'The 2FA investment does not recover its cost under these assumptions. Consider negotiating lower per-user licensing or targeting higher-risk user segments first.' ) + '

'; }

#### Formulas Used

Annual Expected Loss (AEL) without 2FA: AELwithout = N × Pbreach × Cbreach

Annual Expected Loss with 2FA: AELwith = AELwithout × (1 − RiskReduction)

Annual Risk Savings (ALE Reduction): ARS = AELwithout − AELwith

Total 2FA Cost over T years: TotalCost = (ImplCost + TrainingCost) + (N × AnnualCostPerUser × T)

Total Risk Savings over T years: TotalSavings = ARS × T

Net Benefit: NetBenefit = TotalSavings − TotalCost

ROI: ROI (%) = (NetBenefit / TotalCost) × 100

Payback Period: PaybackMonths = OneTimeCosts / ((ARS − AnnualOpCost) / 12)

#### Assumptions & References

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References

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