ForHosting KIT · Travel & geography

EV vs gas break-even calculator

Compare a 30 MPG gas car with an EV using 30 kWh per 100 miles: enter both prices and energy rates, and see how many miles, and at 12,000 miles a year how many years, cheaper energy needs to repay the price gap. Free in your browser.

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Worked example

If you enter

Ev price: 45,000
Gas price: 32,000
Gas mpg: 30
Gas price per gallon: 3.5
Ev kwh per 100mi: 30
Electricity price: 0.14

You get

Price premium: 13,000
Gas cost per mile: 0.1166666667
Ev cost per mile: 0.042
Savings per mile: 0.0746666667

Shoppers comparing an electric vehicle with a gasoline twin often fixate on sticker price and miss the quieter question that actually decides the deal: how many miles until cheaper energy pays back the premium. This EV versus gas break-even calculator takes both purchase prices, the gas car’s MPG and fuel price per gallon, the EV’s kilowatt-hours per 100 miles, and the electricity rate, then returns the break-even mileage where cumulative savings equal the price gap. Optional annual miles convert that figure into years so a commute plan becomes a payback timeline.

How break-even miles are defined and computed

Break-even miles answer a single comparison: if the electric car costs more up front, at what distance do lower energy costs erase that difference. The calculator first forms the purchase-price premium as EV price minus gas price. When the premium is zero or negative the electric car is already cheaper or equal to buy, so break-even miles are reported as zero and no fuel arithmetic is required to justify the purchase on price alone.

When the premium is positive the tool computes cost per mile for each powertrain: gasoline cost per mile is gallons price divided by MPG; EV cost per mile is kilowatt-hours per 100 miles divided by 100, then multiplied by the electricity price per kilowatt-hour. Savings per mile is gas cost per mile minus EV cost per mile. Break-even miles equal the premium divided by savings per mile whenever savings are strictly positive.

If energy costs are equal or the EV is more expensive per mile at the rates you entered, fuel alone never recovers the premium and the response flags that outcome instead of inventing an infinite horizon. Optional annual miles divide break-even miles by yearly distance to produce break-even years for household planning.

All quantities stay in miles and US gallons for the gas side so the SEO landing for an EV versus gas break-even calculator matches the units shoppers type into search boxes in the United States and other MPG markets; currency is a label only and never converts prices behind the scenes.

Who relies on break-even mileage

Dealer configurators and comparison sites need a deterministic oracle that turns sticker prices and local energy rates into a single mileage figure shoppers understand without opening a multi-tab spreadsheet. Fleet managers evaluating electrification scenarios batch many vehicle pairs and electricity tariffs and require byte-stable results for audit trails. Lending and insurance sandboxes can attach break-even miles or years to a quote packet so the customer sees when operating savings catch the down payment gap.

Keep requests small, pin the rounded break-even fields in tests, and you get reproducible payback miles for marketing, ops, and edge workers without standing up a custom cost model of your own.

What you can do with it

Car shopping and dealer demos

Enter EV and gas stickers plus local fuel and electricity rates to show shoppers how many miles until energy savings cover the premium.

Fleet electrification scenarios

Batch vehicle pairs and tariffs to get stable break-even miles and optional years for procurement and audit reports.

FAQ

How do you calculate EV vs gas break-even miles?

Subtract gas purchase price from EV purchase price to get the premium. Compute gas cost per mile as gallon price ÷ MPG and EV cost per mile as (kWh per 100 mi ÷ 100) × electricity price. Break-even miles = premium ÷ (gas cost per mile − EV cost per mile) when savings are positive.

What if the EV costs more per mile to drive?

At those rates fuel savings never offset the premium; adjust efficiency or energy prices and try again.

What if the electric car is cheaper to buy?

Then there is no premium to recover, so break-even miles are reported as zero. When the EV costs the same or less up front, you do not need any fuel savings to justify it on price alone.

How do I turn break-even miles into years?

Add the miles you drive in a year, such as 12,000. The calculator divides the break-even mileage by that yearly distance, so your commute plan becomes a payback timeline in years.

Does it include rebates, incentives or resale value?

No. It compares only the purchase prices and the energy cost of each mile. If local rebates, incentives or a different resale value apply, adjust the prices yourself and read the result alongside those figures.

Related tools

For developers — API access

Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.

API endpoint

POSThttps://api.kit.forhosting.com/travel/ev-break-even-miles

Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.

Call it from your stack

curl -X POST https://api.kit.forhosting.com/travel/ev-break-even-miles \
  -H "Authorization: Bearer $KIT_KEY" \
  -H "Content-Type: application/json" \
  -d '{"ev_price":45000,"gas_price":32000,"gas_mpg":30,"gas_price_per_gallon":3.5,"ev_kwh_per_100mi":30,"electricity_price":0.14}'

const res = await fetch("https://api.kit.forhosting.com/travel/ev-break-even-miles", {
  method: "POST",
  headers: {
    "Authorization": `Bearer ${process.env.KIT_KEY}`,
    "Content-Type": "application/json"
  },
  body: JSON.stringify({
    "ev_price": 45000,
    "gas_price": 32000,
    "gas_mpg": 30,
    "gas_price_per_gallon": 3.5,
    "ev_kwh_per_100mi": 30,
    "electricity_price": 0.14
  })
});
const { task_id } = await res.json();

import os, requests

res = requests.post(
    "https://api.kit.forhosting.com/travel/ev-break-even-miles",
    headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
    json={
    "ev_price": 45000,
    "gas_price": 32000,
    "gas_mpg": 30,
    "gas_price_per_gallon": 3.5,
    "ev_kwh_per_100mi": 30,
    "electricity_price": 0.14
},
)
task_id = res.json()["task_id"]

<?php
$res = file_get_contents("https://api.kit.forhosting.com/travel/ev-break-even-miles", false, stream_context_create([
  "http" => [
    "method"  => "POST",
    "header"  => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
    "content" => '{"ev_price":45000,"gas_price":32000,"gas_mpg":30,"gas_price_per_gallon":3.5,"ev_kwh_per_100mi":30,"electricity_price":0.14}',
  ],
]));
$task = json_decode($res, true);

body := bytes.NewBufferString(`{"ev_price":45000,"gas_price":32000,"gas_mpg":30,"gas_price_per_gallon":3.5,"ev_kwh_per_100mi":30,"electricity_price":0.14}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/travel/ev-break-even-miles", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)

Example request

{
  "ev_price": 45000,
  "gas_price": 32000,
  "gas_mpg": 30,
  "gas_price_per_gallon": 3.5,
  "ev_kwh_per_100mi": 30,
  "electricity_price": 0.14
}

Example response

{
  "task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
  "type": "travel.ev_break_even_miles",
  "status": "queued",
  "_links": {
    "result": "/tasks/tsk_…/result"
  }
}

The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.

Pricing

Per request$0.002

Published price — no tokens, no invented credits. A failed task is never charged.

Errors

HTTP	Code	Meaning
`401`	`unauthorized`	Missing or invalid API key.
`402`	`insufficient_balance`	Your balance doesn't cover the task price.
`404`	`unknown_type`	That task type doesn't exist.
`429`	`rate_limited`	Too many requests. Use the webhook instead of polling.

Technical notes

Input contract, response fields, and validation

Optional currency defaults to USD and is echoed for display. Example: a forty-five thousand electric car against a thirty-two thousand gas car, thirty MPG at three dollars fifty per gallon, thirty kWh per 100 miles at fourteen cents per kWh yields a positive premium, positive savings per mile, and a finite break-even mileage you can quote in a product page or loan comparison. POST a JSON body with six required finite numbers: ev_price and gas_price as non-negative purchase amounts in the same currency; gas_mpg as a positive miles-per-gallon figure; gas_price_per_gallon as a non-negative retail fuel price; ev_kwh_per_100mi as positive EV consumption in kilowatt-hours per 100 miles; and electricity_price as a non-negative price per kilowatt-hour. Optional annual_miles, when present and non-negative, enables the years field. Common aliases are accepted so spreadsheet columns named mpg, efficiency, or price_per_kwh map without renaming. Missing fields, non-finite values, zero or negative MPG, and zero or negative EV consumption fail with invalid_input and are not billed. On success the body echoes the normalized inputs, the derived price_premium, gas_cost_per_mile, ev_cost_per_mile, and savings_per_mile, plus break_even_miles when payback is possible, boolean flags for whether the EV is cheaper to buy and whether fuel can pay back the premium, a short formula string, and an explanatory note. Pair the result with your own residual-value or incentive adjustments if local rebates change the true premium; this endpoint models energy cost recovery only.

Integration use cases

Content and comparison widgets

Power an EV vs gas break-even calculator page where the free browser path matches the API for the same pure inputs.

Technical questions

What if the EV is cheaper to buy than the gas car?

Break-even miles is 0. There is no purchase premium to recover from fuel savings, and the response sets ev_cheaper_to_buy to true.

Does annual_miles change the break-even mileage?

No. Annual miles only add break_even_years = break_even_miles ÷ annual_miles when annual miles are positive. The mileage figure itself depends only on prices and efficiencies.

What does the EV break-even calculator cost?

The browser tool is free. API requests use prepaid KIT balance at $0.002 per successful call; invalid input is not billed.

Read the full KIT documentation →

Run — free