Free vehicle replacement timing optimizer
Fleet Keep vs Replace Calculator
Model the rising cost of keeping an aging vehicle against the capital, financing and residual economics of replacing it — then find the lowest-cost replacement year instead of guessing from mileage or age alone.
Simple replacement optimizer
Replacement FrontierPrice the cost of waiting another year
Current vehicle
Keep-cost escalation
Replacement vehicle
Decision economics
Replacement timing logicEach candidate year keeps the current vehicle until that year, sells it at its modeled market value, purchases the replacement, then carries the new vehicle through the remaining horizon. Purchase price is included once; financing adds only interest cost, avoiding principal double-counting. The optimizer discounts future costs and residual proceeds to today.
Replacement Frontier
Lowest NPV is the economic optimumNPV cost by replacement year
| Strategy | Old vehicle years kept | Old resale at replacement | Old maintenance + downtime | Replacement acquisition | Financing interest | End-horizon residual | NPV lifecycle cost | Delta vs optimum |
|---|
Cost Crossover
How the aging vehicle catches the replacement
Maintenance Escalation × Downtime Cost
Optimal replacement year sensitivity
Advanced fleet replacement queue
Capital QueuePrioritize six vehicle groups by economic urgency
Shared replacement assumptions
Replacement vehicle economics
Annual immediate-replacement budget
Six fleet groups
Fleet logicEach group is optimized independently across the shared horizon. The queue ranks groups by NPV savings versus keeping through the horizon, while the capital-budget view shows how much of the replace-now opportunity can be funded immediately.
Fleet Replacement Queue
Rank vehicle groups by economic urgency
| Rank | Group | Units | Age | Optimal replacement | Keep NPV | Optimal NPV | NPV savings | Current annual keep cost | Current value / unit | Signal |
|---|
Capital Queue
What the annual replacement budget can fund now
Replacement Timing Distribution
Fleet units by optimal replacement year
| Timing | Groups | Units | Estimated net capital | Share of fleet |
|---|
Scope
Replacement timing is an economic estimate, not a maintenance mandate
The model assumes user-entered maintenance, downtime, operating-cost and resale trends continue as specified. Actual replacement decisions can also depend on safety, emissions rules, warranty, parts availability, reliability requirements, financing covenants, tax treatment, lead times and fleet standardization. Financing is modeled as purchase cost plus amortizing-loan interest; principal is not counted twice.