01
Use real-world efficiency
Dashboard or telematics efficiency is more useful than a brochure figure because temperature, payload, speed and route type all change consumption.
Free Fleet EV Calculator
EV Charging Cost Calculator for Company Fleets
Turn vehicle mileage, real-world efficiency and your home, depot and public charging mix into an annual fleet budget. Built for practical planning, from the first EV to multi-country fleets.
No email gateEvery assumption is editableHome, depot and public charging
[01]
Your Charging Model
Fleet Inputs
Build your annual charging budget
Start with the pre-filled 25-vehicle example, then replace each assumption with your own fleet data.
Fleet and energy use
Where vehicles charge
Enter home and depot shares. Public charging is calculated as the remainder, so the mix always totals 100%.
Public charging shareCalculated automatically
Electricity rates and fees
[02]
Transparent Methodology
An EV charging cost calculator that shows its working.
The model separates energy the vehicles use from energy bought at the meter, then prices each charging location independently. It does not hide the charging mix inside one optimistic tariff.
Annual charging cost formula
Battery energyCharging efficiencyWeighted tariffAnnual energy cost
Miles-based units: battery energy = annual fleet miles ÷ miles per kWh.
Metric units: battery energy = annual fleet kilometres ÷ 100 × kWh per 100 kilometres.
Meter energy = battery energy ÷ (1 − charging-loss rate). Annual cost then adds home, depot and public energy at their respective rates, plus any other fees entered.
02
Price the mix, not an average
A cheap depot tariff cannot describe a fleet that relies heavily on rapid public charging. The calculator prices every location separately before producing a weighted rate.
03
Include charging losses
Vehicles receive less energy than the charger draws. The model treats the loss percentage as energy that leaves the meter but does not reach the battery.
04
Keep other fees visible
Subscriptions, idle fees, parking charges and platform fees sit outside the per-kWh tariff. Add them as one fleet-wide monthly figure instead of burying them in the energy rate.
Methodology reviewed July 2026.
[03]
From Estimate to Budget
How to calculate EV charging cost for a growing fleet
A useful charging budget starts with operational data, not a national average. Four steps make the estimate defensible for finance and practical for fleet operations.
- 01
Measure annual distance
Use route plans, odometer history or telematics to estimate annual mileage for the EVs that will actually be in service.
- 02
Use observed efficiency
Take a representative winter and summer average where possible. Vans with payloads usually consume more than passenger cars on the same route.
- 03
Map the charging mix
Estimate what share can happen at home or the depot and what must happen on public networks during working routes.
- 04
Collect complete rates
Use the rate your business really pays or reimburses. Add subscriptions, idle fees and parking charges separately so they remain auditable.
Manage the Real Sessions
A budget is useful. Session-level charging data is better.
Rally Charge brings public charging, company-car charging and home-charging reimbursement into one platform across 20+ European countries, with consolidated payments, CPO comparisons, idle-fee visibility and per-vehicle analytics.
[04]
Questions
EV Charging Cost Calculator FAQs
Estimate annual energy use from fleet distance and real-world EV efficiency, adjust for charging losses, then multiply the energy charged at home, the depot and public networks by each location's tariff. Add subscriptions, idle fees and other non-energy charges to get the full annual budget.
The answer depends on the vehicle's efficiency and your business electricity tariff. In metric units, divide annual kilometres by 100 and multiply by kWh per 100 kilometres. Adjust for charging losses, then multiply the meter energy by the depot tariff.
Loss varies with the vehicle, charger, temperature, battery conditioning and charging power. Ten percent is a practical planning assumption, but use measured meter-to-vehicle data where available. The calculator lets you change the percentage.
Use one consistent basis across every rate. If your finance team budgets net of recoverable VAT, enter net rates and net fees. If you are modelling cash paid including VAT, enter gross figures throughout. VAT recovery rules vary by market and use case.
The prices can differ substantially. A fleet with a low depot tariff but frequent rapid public charging will have a much higher weighted cost than the depot rate alone suggests. Separate inputs make that exposure visible.
Yes. The pre-filled example uses 25 EVs, but every input is editable. The same formula works from a few company cars to regional van operations and large mixed fleets; use averages that reflect the electric vehicles in scope.
Rally Charge supports public charging, company-car charging and home-charging reimbursement across 20+ European countries. Drivers can use Rally Tag, WhatsApp or SMS, while fleet and finance teams get consolidated payments, session-level costs and per-vehicle analytics.