Description: Compare annual energy costs for EV versus gas vehicle. Use this EV vs Gas Cost Calculator to estimate how much you could save (or spend more) each year by driving an electric vehicle instead of a gasoline-powered car.
What this EV vs Gas Cost Calculator calculator does
This EV vs Gas Cost Calculator provides a straightforward comparison of annual fuel and electricity costs for two vehicle types: an electric vehicle (EV) and a gas vehicle. It calculates the difference between the yearly cost to operate a gasoline car and the yearly cost to power an EV using these inputs:
- Annual miles — how many miles you drive per year
- EV kWh per mile — the EV’s energy consumption in kilowatt-hours per mile
- Electricity rate ($/kWh) — your cost of electricity
- Gas vehicle MPG — the gasoline vehicle’s fuel economy in miles per gallon
- Gas price ($/gal) — the local price you pay for gasoline
The calculator returns a single key result labeled Annual Savings, which is the estimated annual cost difference: how much money you save per year by driving the EV instead of the gas vehicle. Positive values mean the EV is cheaper; negative values mean the gas vehicle is cheaper under the provided assumptions.
How to use the EV vs Gas Cost Calculator calculator
Using the EV vs Gas Cost Calculator is simple and requires only five inputs. To get a meaningful result, follow these steps:
- Enter your Annual miles — your typical driving distance per year. Use odometer records or insurance statements if unsure.
- Enter EV kWh per mile — find the rated kWh/mi for the EV model (often listed in vehicle specs or EPA ratings). Typical values range from 0.20 to 0.40 kWh/mi depending on vehicle size and driving conditions.
- Enter Electricity rate ($/kWh) — use your utility bill’s delivered rate (including taxes/fees if you want a fully loaded cost). Overnight charging rates or time-of-use pricing can affect this number.
- Enter Gas vehicle MPG — use the EPA combined MPG rating or your own tracked average.
- Enter Gas price ($/gal) — use the current regional average or the price you usually pay at the pump.
After entering values, the calculator computes Annual Savings immediately. If you leave the gas MPG at zero or invalid, the calculator returns zero to avoid division errors. For best results, try a few scenarios: city vs highway MPG, high vs low electricity rate, and different annual mileages to see how savings scale.
How the EV vs Gas Cost Calculator formula works
The core calculation compares two annual cost estimates: annual gasoline cost and annual EV electricity cost. The formula used by the calculator is shown exactly as implemented:
gas_mpg > 0 ? (annual_miles / gas_mpg * gas_price) - (annual_miles * ev_kwh_per_mile * electricity_rate) : 0
Breakdown of the formula:
- Annual gasoline cost = (annual_miles / gas_mpg) * gas_price. This is the number of gallons needed per year (miles ÷ mpg) multiplied by the $/gallon price.
- Annual EV electricity cost = annual_miles * ev_kwh_per_mile * electricity_rate. This multiplies miles by energy per mile by $ per kWh to get total electricity dollars per year.
- Annual Savings = Annual gasoline cost − Annual EV electricity cost. If gas_mpg is not greater than zero, the formula returns 0 to avoid division by zero or invalid inputs.
Example calculation (illustrative):
- Annual miles = 12,000
- EV kWh per mile = 0.30 kWh/mi
- Electricity rate = $0.15/kWh
- Gas vehicle MPG = 30 MPG
- Gas price = $3.50/gal
Annual gasoline cost = (12,000 / 30) * 3.50 = 400 * 3.50 = $1,400
Annual EV electricity cost = 12,000 * 0.30 * 0.15 = 3,600 * 0.15 = $540
Annual Savings = $1,400 − $540 = $860 per year in favor of the EV.
Use cases for the EV vs Gas Cost Calculator
This calculator is useful for a range of audiences and decisions:
- Car shoppers comparing total operating cost differences between EVs and gas cars before purchase.
- Fleet managers estimating yearly operating savings when considering electrification of company vehicles.
- Commuters deciding whether switching to an EV will yield cost savings given their commute distance and local energy prices.
- Policy analysts or researchers building simple cost comparisons across regions with different fuel and electricity rates.
- Homeowners evaluating whether investing in home charging or solar panels will improve the economics of an EV.
Because it focuses strictly on energy/fuel costs, this tool is best used as a component in broader purchase or fleet decisions. Combine its results with maintenance, depreciation, incentives, and insurance estimates for a complete total cost of ownership (TCO) analysis.
Other factors to consider when calculating x
When calculating the difference in annual running costs between an EV and a gas vehicle (what we’ve referred to as x), keep these important factors in mind:
- Charging efficiency and losses: EVs experience some energy loss during charging (typically 5–15%). If you want more precision, increase the effective EV kWh/mi to account for charging losses.
- Time-of-use electricity pricing: Many utilities offer lower overnight rates. If you charge mostly at night, use the off-peak electricity rate rather than the average rate.
- Home solar or workplace charging: If you have solar generation or free workplace chargers, your effective electricity cost can be much lower—or close to zero—for a portion of your charging needs.
- Maintenance and repair costs: EVs typically have lower routine maintenance (no oil changes, fewer moving parts), which adds to lifetime savings beyond the energy comparison.
- Depreciation and resale value: Different vehicles depreciate at different rates, which affects the overall cost of ownership.
- Incentives and tax credits: Rebates, federal and state incentives, and lower registration fees can change the economics substantially in favor of EVs.
- Driving habits and climate: Aggressive driving, extreme temperatures (which affect battery efficiency and HVAC use), and hilly terrain all influence the EV kWh/mi and gas MPG inputs.
- Fuel price volatility: Gasoline prices can swing widely, meaning projections should be stress-tested with high and low fuel price scenarios.
Use the EV vs Gas Cost Calculator as a fast, transparent starting point, then refine inputs and include the above considerations for a fuller financial picture.
FAQ
Q: What does a positive Annual Savings number mean?
A positive Annual Savings means the EV costs less to power for the year than the gas vehicle costs to fuel. A negative number indicates the gas vehicle is cheaper for the given inputs.
Q: What should I enter for EV kWh per mile if I don’t know it?
If you don’t have a specific number, use a typical range: small EVs ~0.20–0.25 kWh/mi, midsize ~0.25–0.30 kWh/mi, large SUVs ~0.30–0.40 kWh/mi. For a conservative estimate, use a slightly higher kWh/mi.
Q: Why does the calculator return zero if gas MPG is zero?
The formula guards against division by zero by returning 0 when gas_mpg is not greater than zero. Provide a realistic MPG value to get a proper comparison.
Q: Does this calculator include maintenance and other ownership costs?
No. This calculator compares only annual energy/fuel costs. For a full comparison, add estimates for maintenance, insurance, depreciation, incentives, and taxes.
Q: Can I use different electricity rates for home and public charging?
Yes. For best accuracy, estimate the percentage of charging done at each rate and compute a weighted average electricity rate to use in the calculator.