Upgrading to fiber becomes obvious when you turn vague benefits into a clear model with inputs you control. Put capex, term, tax credits, monthly savings, and revenue lift in one calculator, then read out payback, NPV, and IRR. If the model works at conservative assumptions, you can sign with confidence.
How fiber creates return
Model all three in a single monthly cash flow. Subtract maintenance and any new cross connect costs. Treat tax credits and one time rebates as capex offsets.
ROI calculator
Enter conservative inputs. Results include payback months, NPV, IRR, and a simple break even bandwidth view.
Break even bandwidth
If you move from a fixed legacy circuit to fiber priced per mile and pair, your cost per Mbps usually falls as you scale. Enter your planned throughput.
Sensitivity: outcome if savings vary
Slide the realized monthly savings as a percent of plan. The model recomputes payback and NPV.
Checklist for a decision memo
- Map savings: which legacy circuits retire and when.
- Confirm one time work: laterals, bores, and handholes.
- Call out O&M and cross connects as separate lines.
- Put outage minutes and avoided costs on one row per site.
- Run the model with conservative revenue lift and verify break even at today’s traffic.
- Document payback trigger: the month cumulative cash turns positive.
A careful ROI model makes the decision clear for finance and operations. Use conservative inputs, include O and M and escalators, and test sensitivity so leadership sees the range of outcomes. Before you commit, verify the timing of legacy disconnects and any one time work, then lock in the acceptance tests that confirm the savings you modeled.
