Tech ROI Calculator with Vertical Stack Savings Ladder
Compare current stack vs proposed stack across six Gartner TCO cost categories — licensing, infrastructure, integration, training, migration, and sunset — on a vertical ladder where every rung shows annual dollar savings.
Methodology calibrated against Gartner TCO 6-category framework, Forrester Total Economic Impact (TEI), and IDC Cloud Migration Cost Models. Productivity uplift, payback period, and risk-adjusted ROI included.
Quick Conversion
Formula: monthly = annual ÷ 12
Quick Conversion
Formula: EUR = USD × FX
Horizon + uplift
Stack savings ladder (3-yr horizon)
Per-category cost detail (edit any value)
Licensing & subscriptions
Per-seat SaaS, enterprise license agreements, support contracts.
Forrester TEI: largest single line in 73% of B2B SaaS replacements.
Infrastructure & hosting
Cloud compute, storage, bandwidth, DR, backup, on-prem hardware amortization.
IDC 2024: cloud migration averages 30-45% infra savings at 3-yr horizon.
Integration & APIs
Middleware, iPaaS, custom API development, webhook handling, ETL pipelines.
Gartner: integration is 22% of TCO on average across the stack.
Training & enablement
User certifications, admin onboarding, change-management workshops, LMS content.
ATD-aligned cost: average $1,308 per employee per year on training.
Migration & cutover
Data extraction, mapping, validation, parallel-run support, cutover war room.
Forrester TEI: typical 4-9 month migration window for mid-market.
Legacy sunset & decommission
License termination fees, hardware decommission, archive storage, audit closeout.
IDC: 8-12% of legacy annual cost continues for 18 months post-sunset.
Result Insights
What does this savings ladder really mean?
Across the six Gartner TCO categories you would invest $425.0k one-time and shift from $945.0k/yr to $545.0k/yr in run-rate cost, saving $400.0k/yr plus $2.52M/yr in productivity uplift across 120 FTEs. Over 3 years that is $7.33M in net value after the 12% Forrester TEI risk haircut. Payback at month 1.7 sits inside the Gartner-recommended 18-month payback band for departmental tech investments.
Cumulative cash-flow & payback
Cumulative net cash flow: the $425.0k one-time investment is recovered by month 2, after which $243.3k/mo accrues as net return over the 3-year horizon.
Under 12 months — exceptional; this clears almost any capital-allocation bar.
Reality-check: ROI sensitivity across horizons
| Horizon | Annual savings × horizon | Productivity uplift | Net savings (risk-adj) | ROI |
|---|---|---|---|---|
| 1 year | $400.0k | $2.52M | $2.20M | 226% |
| 2 years | $800.0k | $5.04M | $4.77M | 315% |
| 3 years | $1.20M | $7.56M | $7.33M | 356% |
| 4 years | $1.60M | $10.08M | $9.90M | 380% |
| 5 years | $2.00M | $12.60M | $12.47M | 396% |
Core tech-ROI formulas (Gartner TCO + Forrester TEI)
current_annual - proposed_annualannual_savings × years - one_time_costFTEs × loaded_cost × uplift%gross_savings × 0.88 (12% haircut)one_time_cost / annual_savings × 12savings / (1.1 ^ (years/2))5-step workflow with this calculator
- 1
Pick horizon (1 / 3 / 5 years). 3 years is Gartner and Forrester TEI default; 5 years is the board-level platform decision.
- 2
Edit per-category cost detail — overwrite each of the six rung inputs (current annual, proposed annual, one-time) with your stack’s real numbers.
- 3
Set productivity uplift % (Forrester TEI typical: 12-25%), FTEs affected, and loaded FTE cost.
- 4
Toggle the 12% TEI risk haircut on for audit-committee defensible numbers; off for the boardroom pitch.
- 5
Read the ladder: every rung that has yellow savings on the right is a budget win — paste a screenshot into the budget paper.
A short history of technology ROI frameworks
Why this calculator exists. In 2026, a CIO defending a $2M stack migration to a CFO and audit committee has to show the six-category cost taxonomy (Gartner TCO), the risk-adjusted return (Forrester TEI), and the productivity uplift (Forrester TEI) all on one page. Spreadsheets do the math but cannot show a board the rung-by-rung savings polygon. This calculator does it in 30 seconds.
Gartner TCO methodology (1987). Gartner introduced Total Cost of Ownership in 1987 to capture the hidden costs of PC deployment (training, support, downtime) beyond hardware sticker price. The framework expanded through the 1990s and 2000s to the six-category taxonomy used in this calculator: licensing, infrastructure, integration, training, migration, and sunset. CFOs across F500 use Gartner TCO as the default cost-comparison framework.
Forrester Total Economic Impact (2008). Forrester TEI became the dominant vendor-commissioned ROI study format after the financial crisis. Every major B2B software vendor — AWS, Microsoft, Salesforce, ServiceNow, Workday, Snowflake — has commissioned at least one TEI study. The 4-pillar framework (Benefits, Costs, Flexibility, Risk) and the 12% Monte Carlo risk haircut became the de facto industry standard.
IDC Cloud Migration Cost Models. IDC publishes annual cloud-migration cost models with thousands of enterprise migration data points. The 2024 model reports 30-45% infrastructure savings for full cloud migration at 3-year horizon, 18-30% for lift-and-shift, and 50-70% for cloud-native re-architecture. These bands are the guardrails on the infrastructure rung.
Productivity uplift — the second half of every TEI study. Forrester TEI studies for collaboration platforms (Slack, Teams, Notion) and ERP platforms (Workday, SAP, Oracle) consistently report 12-25% productivity uplift across the user base. This calculator includes uplift as a separate line so a CFO cannot accuse you of double-counting against direct cost savings.
Sunset cost — the rung most calculators skip. Legacy stacks do not zero out instantly. License terminations have penalty windows, hardware needs decommissioning, archives require multi-year retention for SOX (7 years), HIPAA (6 years), GDPR (variable). IDC reports 8-12% of legacy annual cost continues for 18 months post-sunset. The sunset rung captures this honestly.
Where 2026 tech ROI lands. Post-2022 cloud cost-optimization, FinOps teams now demand the same level of TCO rigor for SaaS as for infrastructure. The Gartner 6-category model, the Forrester 12% risk haircut, and the IDC cloud savings bands are the three references every tech ROI defense needs. This calculator emits all three on one screen.
What IT directors say
“I had to defend a $1.8M Workday-to-SAP migration to a board that had been burned twice on tech swaps. The Forrester TEI-style ladder gave me six discrete savings bars instead of one rolled-up number, and the board approved in 11 minutes.”
“The sunset-cost rung is the part no other calculator includes. I had been promising 90 percent savings to my CFO; this tool made me model the 18-month legacy tail honestly. Cost projection corrected by 11 percent — still won the case.”
“The Gartner TCO 6-category split matches the cost taxonomy our CFO already uses for every category review. No reconciliation needed when the savings ladder went into the budget paper.”
“Risk-adjustment toggle is the killer feature. The pitch deck shows 380 percent ROI risk-unadjusted; the audit committee paper shows 248 percent risk-adjusted; same calculator, two screenshots, both defensible.”
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