Technology Stack TCO (Total Cost of Ownership) Calculator

ANA›Life Services Authority›National Calculator Authority›Technology Stack TCO (Total Cost of Ownership) Calculator

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Technology Stack TCO (Total Cost of Ownership) Calculator

Calculate the complete Total Cost of Ownership for your technology stack over a defined period, including all direct and indirect costs such as licensing, infrastructure, personnel, maintenance, training, and downtime losses.

### 📅 Time Horizon

Analysis Period (Years)

### 💰 Initial / One-Time Costs

Upfront License / Purchase Cost ($)

Implementation & Integration Cost ($)

Hardware / Equipment Purchase ($)

Data Migration & Setup Cost ($)

### 🔄 Annual Recurring Costs

Annual Subscription / License Fees ($/yr)

Annual Infrastructure / Hosting / Cloud ($/yr)

Annual Maintenance & Support Contracts ($/yr)

Annual Security & Compliance Costs ($/yr)

### 👥 Personnel Costs

Number of IT/Dev Staff Supporting This Stack

Average Annual Fully-Loaded Salary per Staff ($/yr)

% of Their Time Dedicated to This Stack (%)

Annual Training & Certification Costs ($/yr)

### ⚠️ Risk & Downtime Costs

Expected Annual Downtime Hours (hrs/yr)

Cost of Downtime per Hour ($/hr)

Annual Incident Response & Recovery Costs ($/yr)

### 📈 Growth & Inflation

Annual Cost Escalation Rate (%/yr)

Discount Rate for NPV Calculation (%/yr)

Calculate TCO

### 📊 TCO Analysis Results

#### One-Time Costs

Upfront Licenses & Purchase Implementation & Integration Hardware & Equipment Data Migration & Setup Total One-Time Costs

#### Recurring Costs Over Years

Subscriptions & Licenses Infrastructure & Hosting Maintenance & Support Security & Compliance Personnel (Allocated) Training & Certification Downtime Losses Incident Response Total Recurring Costs

#### Summary

Nominal TCO (Undiscounted) Net Present Value (NPV) of TCO Average Annual TCO Average Monthly TCO

#### Cost Breakdown by Category (%)

function tec_fmt(n) { return '$' + n.toFixed(2).replace(/\B(?=(\d{3})+(?!\d))/g, ','); } function tec_pct(n) { return n.toFixed(1) + '%'; }

function tec_calc() { // --- Read inputs --- var years = parseFloat(document.getElementById('tec_years').value); var license_up = parseFloat(document.getElementById('tec_license_upfront').value) || 0; var impl = parseFloat(document.getElementById('tec_implementation').value) || 0; var hardware = parseFloat(document.getElementById('tec_hardware').value) || 0; var migration = parseFloat(document.getElementById('tec_migration').value) || 0; var license_ann = parseFloat(document.getElementById('tec_license_annual').value) || 0; var infra_ann = parseFloat(document.getElementById('tec_infrastructure').value) || 0; var maint_ann = parseFloat(document.getElementById('tec_maintenance').value) || 0; var security_ann = parseFloat(document.getElementById('tec_security').value) || 0; var it_staff = parseFloat(document.getElementById('tec_it_staff').value) || 0; var it_salary = parseFloat(document.getElementById('tec_it_salary').value) || 0; var it_pct = parseFloat(document.getElementById('tec_it_time_pct').value) || 0; var training_ann = parseFloat(document.getElementById('tec_training_annual').value) || 0; var downtime_hrs = parseFloat(document.getElementById('tec_downtime_hrs').value) || 0; var downtime_cost = parseFloat(document.getElementById('tec_downtime_cost').value) || 0; var incident_ann = parseFloat(document.getElementById('tec_incident_annual').value) || 0; var inflation_rate = parseFloat(document.getElementById('tec_inflation_rate').value) || 0; var discount_rate = parseFloat(document.getElementById('tec_discount_rate').value) || 0;

// --- Validation --- var errors = []; if (isNaN(years) || years 20) errors.push("Analysis period must be between 1 and 20 years."); if (it_pct 100) errors.push("Staff time dedication must be between 0% and 100%."); if (inflation_rate 50) errors.push("Inflation rate must be between 0% and 50%."); if (discount_rate 50) errors.push("Discount rate must be between 0% and 50%.");

if (errors.length > 0) { alert("Please fix the following errors:\n\n" + errors.join("\n")); return; }

years = Math.round(years);

// --- One-time costs (Year 0) --- var onetime_total = license_up + impl + hardware + migration;

// --- Annual base costs (Year 1 values) --- var personnel_ann_base = it_staff * it_salary * (it_pct / 100); var downtime_ann_base = downtime_hrs * downtime_cost;

// Annual recurring base (Year 1): // C_recurring_base = license_ann + infra_ann + maint_ann + security_ann // + personnel_ann_base + training_ann + downtime_ann_base + incident_ann var recurring_base = license_ann + infra_ann + maint_ann + security_ann + personnel_ann_base + training_ann + downtime_ann_base + incident_ann;

// --- Escalated recurring costs with NPV --- // For year t (1..N): // Nominal cost_t = recurring_base * (1 + g)^(t-1) [g = inflation rate] // Discounted cost_t = cost_t / (1 + r)^t [r = discount rate] // // Sum of nominal recurring = recurring_base * SUM_{t=1}^{N} (1+g)^(t-1) // = recurring_base * [(1+g)^N - 1] / g if g != 0 // = recurring_base * N if g == 0 // // NPV of recurring = recurring_base * SUM_{t=1}^{N} (1+g)^(t-1) / (1+r)^t // = (recurring_base / (1+r)) * SUM_{t=0}^{N-1} [(1+g)/(1+r)]^t // = (recurring_base / (1+r)) * [(x^N - 1)/(x - 1)] where x = (1+g)/(1+r), x != 1 // = recurring_base * N / (1+r) if x == 1

var g = inflation_rate / 100; var r = discount_rate / 100;

var nominal_recurring_total = 0; var npv_recurring_total = 0;

// Per-category nominal totals (for breakdown) var cat_license_total = 0; var cat_infra_total = 0; var cat_maint_total = 0; var cat_security_total = 0; var cat_personnel_total = 0; var cat_training_total = 0; var cat_downtime_total = 0; var cat_incident_total = 0;

var yearly_rows = [];

for (var t = 1; t 0 ? (cat.value / nominal_tco * 100) : 0; breakdown_html += '' + '' + '' + cat.label + '' + '' + tec_fmt(cat.value) + ' (' + tec_pct(pct) + ')' + '' + '' + '' + ''; }); document.getElementById('tec_r_breakdown').innerHTML = breakdown_html;

// --- Year-by-year table --- var tbl = '#### Year-by-Year Cost Projection ' + '' + '' + 'Year' + 'Licenses' + 'Infra' + 'Maint' + 'Security' + 'Personnel' + 'Training' + 'Downtime' + 'Incident' + 'Annual Total' + 'Cumulative' + '';

// Year 0 row (one-time) tbl += '' + '0 (Setup)' + '' + tec_fmt(license_up) + '' + '' + tec_fmt(hardware) + '' + '' + tec_fmt(maint_ann > 0 ? 0 : 0) + '' + '$0.00' + '' + tec_fmt(impl) + '' + '' + tec_fmt(migration) + '' + '$0.00' + '$0.00' + '' + tec_fmt(onetime_total) + '' + '' + tec_fmt(onetime_total) + '' + '';

yearly_rows.forEach(function(row, idx) { var bg = idx % 2 === 0 ? '#f9f9f9' : '#fff'; tbl += '' + '' + row.year + '' + '' + tec_fmt(row.license) + '' + '' + tec_fmt(row.infra) + '' + '' + tec_fmt(row.maint) + '' + '' + tec_fmt(row.security) + '' + '' + tec_fmt(row.personnel) + '' + '' + tec_fmt(row.training) + '' + '' + tec_fmt(row.downtime) + '' + '' + tec_fmt(row.incident) + '' + '' + tec_fmt(row.total) + '' + '' + tec_fmt(row.cumulative) + '' + ''; });

tbl += ''; document.getElementById('tec_r_yearly_table').innerHTML = tbl;

document.getElementById('tec_result').style.display = 'block'; }

#### Formulas Used

Total Cost of Ownership (Nominal):

TCO = C_onetime + Σ(t=1 to N) [ C_recurring_base × (1 + g)^(t−1) ]

Where:

Personnel Cost (Allocated):

Personnel_ann = Number_of_Staff × Avg_Salary × (Time_Dedication% / 100)

Downtime Cost:

Downtime_ann = Downtime_Hours_per_Year × Cost_per_Hour

Net Present Value (NPV) of TCO:

NPV_TCO = C_onetime + Σ(t=1 to N) [ C_recurring_base × (1+g)^(t−1) / (1+r)^t ]

Where r = discount rate (opportunity cost of capital).

Average Annual TCO:

Annual_Avg = Nominal_TCO / N

#### Assumptions & References

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References

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