Free Tool

Application Modernization 
ROI Calculator 

Estimate the annual savings, payback period and 3-year ROI of modernizing a legacy system. Move the sliders — the numbers update instantly. No signup.

Your scenario

8
People maintaining or building around it
$180,000
Salary + tax + benefits + overhead
40%
Share of the team's time the legacy system eats
50%
How much of that drag modernization removes
$240,000
What the legacy stack costs to run
25%
Right-sizing, autoscaling, fewer idle resources
$250,000
One-time cost of the project
Estimated annual savings$348,000
8.6 moPayback period
318%3-year ROI
$794,0003-year net gain
  • Maintenance drag today$576,000/yr
  • Engineering time reclaimed$288,000/yr
  • Infrastructure savings$60,000/yr
  • 3-year cumulative savings$1,044,000

Directional estimate based on your inputs — not a quote. The biggest variable is how much maintenance drag the modernization actually removes; we pressure-test that with you before any number goes in a business case.

What actually drives modernization ROI

  • Reclaimed engineering time is usually the biggest lever — far bigger than infra savings. Most legacy drag is people, not servers.
  • Modernization rarely needs a big-bang rewrite. The lower-risk path is incremental — see our guide to the strangler-pattern migration.
  • Infra savings compound when you right-size as you go — the levers in our AWS cost optimization playbook.
  • Payback under ~18 months usually clears a CFO's bar; this tool shows where your scenario lands.

Email me the full breakdown

We'll send your scenario plus a short, engineer-written breakdown. No spam; unsubscribe anytime.

Want a real number for your system?

We'll assess your legacy stack and put a defensible business case behind it. Talk to a senior engineer.

Book a 30-min call