# EV Versus Petrol Cost Calculator — United Kingdom

> Compare an EV purchase-price difference with energy and maintenance scenarios for equal annual driving. GBP planning view; stated limitations apply.

Page: https://askcalculators.com/uk/ev-vs-petrol/
Definition: https://askcalculators.com/uk/ev-vs-petrol/definition.json
JSON Schema: https://askcalculators.com/uk/ev-vs-petrol/schema.json
Version: 20.16.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/uk/ev-vs-petrol/?unitSystem=metric&annualDistance=20000&evConsumption=18&chargeEfficiency=90&electricityRate=0.2&fuelConsumption=7&fuelPrice=1.6&evPurchase=40000&fuelPurchase=30000&evMaintenance=500&fuelMaintenance=800&years=8

## Inputs
- unitSystem: Measurement system; type=select; optional; default=metric; values=imperial|metric
- annualDistance: Annual driving distance; type=number; required; default=20000; min=0; max=1000000000000
- evConsumption: Vehicle battery consumption; type=number; required; default=18; min=0.01; max=1000000000000
- chargeEfficiency: Wall-to-battery charging efficiency; type=percent; required; default=90; min=0; max=100
- electricityRate: Electricity price per wall kWh; type=money; required; default=0.2; min=0; max=1000000000000
- fuelConsumption: Comparison fuel consumption; type=number; required; default=7; min=0.01; max=1000000000000
- fuelPrice: Fuel price per volume unit; type=money; required; default=1.6; min=0; max=1000000000000
- evPurchase: EV purchase price after confirmed incentives; type=money; required; default=40000; min=0; max=1000000000000
- fuelPurchase: Comparison vehicle purchase price; type=money; required; default=30000; min=0; max=1000000000000
- evMaintenance: Annual EV maintenance assumption; type=money; required; default=500; min=0; max=1000000000000
- fuelMaintenance: Annual comparison maintenance assumption; type=money; required; default=800; min=0; max=1000000000000
- years: Comparison horizon, years; type=number; required; default=8; min=1; max=50

## Outputs
- evEnergyCost: Annual EV energy spending; format=currency
- fuelEnergyCost: Annual comparison fuel spending; format=currency
- extraCapital: Extra EV purchase cost; format=currency
- annualSaving: Annual energy and maintenance saving; format=currency
- payback: Simple purchase-premium payback, years; format=number
- horizonSaving: Energy/maintenance saving less purchase premium; format=currency; primary

## Formula
annual saving = comparison energy + maintenance − EV energy − maintenance.

Inputs are converted to canonical units before evaluating this stated formula.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.

Notice: Illustrative defaults are not local quotes or verified legal rules. Dated reference components and user-entered assumptions are explicitly distinguished. Professional review is pending.