Fleet Electrification ROI Calculator
Fleet electrification lives or dies on two numbers: how much each vehicle saves every year in fuel and maintenance, and how much it costs to make the switch up front. This calculator takes fleet size, annual miles per vehicle, diesel/gas and electric fuel cost per mile, diesel/gas and electric maintenance cost per mile, the EV price premium per vehicle, one-time charging infrastructure cost, and any available per-vehicle incentives, then reports annual fuel and maintenance savings per vehicle, total annual savings per vehicle and for the whole fleet, the total upfront cost premium, and the fleet payback period in years. For the single-vehicle version of this same tradeoff, see our EV vs. ICE Total Cost Calculator.
Total vehicles in the fleet you are evaluating for electrification.
Average miles driven per vehicle per year. Higher-mileage fleets electrify faster.
Diesel fuel typically runs $0.15-0.25/mile for commercial vehicles.
Electric fuel cost typically runs $0.03-0.06/mile with depot/commercial charging rates -- a 60-80% reduction vs. diesel.
Typical diesel/gas maintenance cost per mile (oil changes, brakes, drivetrain, exhaust aftertreatment).
EVs have roughly 20 moving drivetrain parts vs. 2,000+ in a diesel engine, cutting maintenance costs 30-50%.
Light-duty EVs typically cost $10,000-30,000 more upfront than diesel equivalents; medium/heavy-duty trucks run substantially higher.
Depot charging installation (hardware + electrical work) typically runs $5,000-50,000+ per location depending on power requirements.
Federal and state fleet electrification incentives have shifted significantly in recent years -- enter your specific, currently confirmed incentive amount rather than assuming a historical credit.
(diesel/gas $/mile − electric $/mile) × annual miles per vehicle
(diesel/gas maint. $/mile − electric maint. $/mile) × annual miles per vehicle
annual fuel savings + annual maintenance savings
total annual savings per vehicle × number of vehicles
(EV price premium × vehicles) + charging infrastructure − (incentives × vehicles)
Moderate payback -- verify route suitability and charging access
Results update live as you type. For planning and field-check estimates — always verify against applicable standards and equipment ratings.
How we calculate this →Fuel is where fleet electrification really pays off: at $0.20/mile diesel vs. $0.045/mile electric, a single truck driving 25,000 miles a year saves nearly $3,875 annually on fuel alone -- before counting maintenance. But the upfront math matters just as much: a 10-truck fleet facing a $20,000/vehicle price premium plus $100,000 in charging infrastructure needs about 6 years to break even without incentives. Federal and state incentive programs have shifted significantly in recent years, so verify current eligibility carefully before factoring a credit into your payback calculation.
How fleet electrification ROI is calculated
This calculator compares the ongoing per-mile running costs of electric vehicles against the diesel or gas vehicles they replace, then weighs those savings against the one-time cost of making the switch. Six quantities tie the calculation together.
Annual Fuel Cost Savings per Vehicle ($) = (Diesel/Gas Fuel Cost ($/mile) − Electric Fuel Cost ($/mile)) × Annual Miles per Vehicle. At $0.20/mile diesel, $0.045/mile electric, and 25,000 mi/yr, that is (0.20 − 0.045) × 25,000 = $3,875/yr. Annual Maintenance Savings per Vehicle ($) = (Diesel/Gas Maintenance Cost ($/mile) − Electric Maintenance Cost ($/mile)) × Annual Miles per Vehicle; at $0.08 and $0.04/mile, that is (0.08 − 0.04) × 25,000 = $1,000/yr, reflecting EVs' far fewer moving parts and regenerative braking.
Total Annual Savings per Vehicle ($) = Annual Fuel Cost Savings + Annual Maintenance Savings — $4,875 at the defaults. Total Annual Fleet Savings ($) = Total Annual Savings per Vehicle × Number of Vehicles — $4,875 × 10 = $48,750/yr. Total Upfront Cost Premium ($) = (EV Price Premium per Vehicle × Number of Vehicles) + Charging Infrastructure Cost − (Available Incentives per Vehicle × Number of Vehicles); at a $20,000 premium, $100,000 infrastructure, and $0 incentives across 10 vehicles, that is ($20,000 × 10) + $100,000 − $0 = $300,000.
Fleet Payback Period (years) = Total Upfront Cost Premium ÷ Total Annual Fleet Savings — $300,000 ÷ $48,750 ≈ 6.15 years, the point at which cumulative fuel and maintenance savings have repaid the full upfront cost of the switch. The model uses flat per-mile fuel and maintenance costs and excludes residual value differences, financing costs, and electricity demand charges at the depot, all of which can shift real-world payback. Data sources: U.S. Department of Energy (DOE) vehicle fuel cost and maintenance cost studies; commercial fleet electrification case studies; EV charging infrastructure cost benchmarks from industry reports.