TripSwap

E-Bike vs Car Cost and Payback Calculator

It only beats the car on the trips it genuinely takes over.

E-bike price ($)

Expected life (years)

Maintenance ($/yr)

Insurance ($/yr)

Electricity per charge ($)

Miles per charge

Car trips per week

Average trip (miles)

Trips an e-bike suits (%)

Days weather rules it out (%)

Car cost per mile ($)

Parking per trip ($)

Annual theft risk (%)

Payback

3.5 years

Only the car's variable costs are saved — fuel, wear and parking. Insurance, tax and depreciation carry on unless the car itself goes, which is why an e-bike that replaces a second car pays back far faster than one that just sits alongside the first.

Net saving per year: $629
Cost per trip: $2.38 vs $3.51 by car
Saving over its life: $2,200

What you entered

E-bike price ($): 2200Expected life (years): 7Maintenance ($/yr): 180Insurance ($/yr): 120Electricity per charge ($): 0.14Miles per charge: 38Car trips per week: 9Average trip (miles): 4.2Trips an e-bike suits (%): 70Days weather rules it out (%): 15Car cost per mile ($): 0.24Parking per trip ($): 2.5Annual theft risk (%): 2

1
Car trips the e-bike really replaces
9 trips/wk × 52 × 70% suitable × (1 − 15% weather)= 278 trips (1,170 miles)
2
Car costs those trips avoid
1,170 mi × $0.24 + 278 × $2.50 parking= $976.84 a year
3
Cost of running the e-bike
$180 maintenance + $120 insurance + $4.31 charging + $44 theft risk at 2%= $348.31 a year
4
Net saving a year
$976.84 − $348.31= $628.53
5
Payback on the purchase
$2,200 ÷ $628.53 a year= 3.5 years, against a 7-year life
6
Cost per trip, each way of travelling
e-bike incl. depreciation vs car variable cost= $2.38 vs $3.51

Result

Payback: 3.5 years

Replacing 70% of your car trips — 278 a year after allowing for weather — saves $977 in fuel, wear and parking against $348 to run the bike. That is $629 a year net, paying back the $2,200 purchase in 3.5 years and saving $2,200 over a 7-year life. Per trip it costs $2.38 against $3.51 by car.

E-bike payback at different shares of car trips replaced

A 2,200 dollar e-bike with a 7-year life, run against 9 car trips a week averaging 4.2 miles, with 15 percent of days lost to weather. Running costs are 180 a year maintenance, 120 insurance, charging at 14 cents per 38-mile charge and a 2 percent annual theft risk; the car side saves 24 cents a mile plus 2.50 parking per trip. Only the share of trips an e-bike suits changes down the rows.

Trips an e-bike suits (%)	Car trips replaced per year	Net saving per year	Payback (years)	Saving over a 7-year life
30%	119	$73	30.2	-$1,690
40%	159	$212	10.4	-$718
50%	199	$351	6.3	$255
60%	239	$490	4.5	$1,227
70%	278	$629	3.5	$2,200
80%	318	$767	2.9	$3,172
90%	358	$906	2.4	$4,145
100%	398	$1,045	2.1	$5,117

The replacement rate is the input the whole answer turns on, and it is the easiest one to overstate. Below about 47 percent this bike never pays back inside its 7-year life, and the negative figures in the last column are losses, not savings. Only the car's variable costs are counted here: insurance, road tax and depreciation carry on whether the car moves or not, so the arithmetic changes completely if the bike lets a household drop a second car. The theft line is an expected cost (price x annual risk), which is real spending averaged over many years rather than a bill you receive. Illustrative figures only. Put in your own prices, trip pattern and local weather before deciding.

An e-bike versus car calculator works out whether an electric bike pays for itself against the car journeys it actually replaces, and how long that takes. The comparison usually goes wrong at the first step, because it is tempting to compare the e-bike against the total cost of running a car. That is only the right comparison if buying the bike lets you get rid of the car. If the car stays on the drive, its insurance, tax and depreciation continue regardless, and the e-bike is competing only against the variable costs - fuel, wear, and parking - of the specific trips it takes over.

Two factors decide the answer, and neither is the price of the bike. The first is the share of your trips an e-bike can genuinely handle: short local journeys with little to carry are ideal, the school run with two children and a week of shopping is not. The second is weather. In most climates a meaningful share of days are wet, icy or dark enough that the bike stays in the shed, and a model that ignores this overstates the saving by exactly that fraction. Multiplying trips by both figures gives the number the whole calculation rests on.

Running costs are small but not zero. Electricity is close to negligible - a few dollars a year at typical range and tariffs. Maintenance is real, since e-bikes wear brakes, tyres and chains faster than ordinary bicycles because of the extra weight and speed. Insurance is worth carrying on a machine costing thousands, and theft risk deserves an explicit expected-cost line rather than optimism: a percentage chance of losing the bike each year is a genuine annual cost whether or not it happens in any particular year.

The output is a payback period compared against the bike's realistic life, plus a cost per trip for each mode. Payback inside the life means the purchase is financially sound as well as pleasant; payback beyond it means you are buying the bike for other reasons, which is a perfectly good decision as long as it is made knowingly. The figure that moves the result most is the replacement rate, so it is worth being honest about how many trips you would really make on a bike rather than how many you would like to.

Only variable car costs are saved

Insurance, road tax and depreciation continue whether the car moves or not, so an e-bike bought alongside a car competes only against fuel, wear and parking on the trips it replaces. The arithmetic changes completely if the bike lets a household drop a second car, because the fixed costs then disappear too - which is where the large savings actually are.

Weather and trip suitability decide the payback

The replacement rate is the input the whole result turns on, and it is the easiest to overstate. Count the trips you would genuinely make on a bike in the weather you actually get, not the ones that are theoretically possible. A model assuming every short journey converts will show a payback roughly twice as fast as reality delivers.

Frequently asked questions

A 2,200 dollar e-bike replacing 70 percent of 9 weekly car trips - does it pay back?

Yes, in 3.5 years against a 7-year life. After allowing for 15 percent of days lost to weather it replaces 278 trips and 1,170 miles a year, saving 977 dollars in fuel, wear and parking against 348 to run the bike - a net 629 a year, and 2,200 dollars saved over its life.

What does each trip cost by bike versus car?

2.38 dollars by e-bike including depreciation, against 3.51 by car. The e-bike figure includes the purchase spread over seven years, maintenance, insurance, charging and theft risk, so it is a fair comparison rather than an energy-cost-only one - electricity alone is about 4 dollars a year.

Should theft risk really be a line item?

Yes. A two percent annual chance of losing a 2,200 dollar bike is an expected cost of 44 dollars a year, more than ten times the electricity. It is a real cost whether or not it happens to you in a given year, and in a high-theft area at ten percent it becomes one of the largest running costs.

What if it lets us sell a car?

Then the answer changes entirely, because insurance, tax and depreciation stop as well as fuel and parking - typically several thousand dollars a year rather than several hundred. This calculator is deliberately conservative and models the bike alongside a car you keep. If a car genuinely goes, add its fixed costs to the saving.

How does this compare to the cost per mile calculator?

The cost per mile calculator gives the running cost of a vehicle you already own. This one compares two ways of making the same journeys and asks whether switching pays back a purchase - which needs the replacement rate, weather, parking and theft risk that a per-mile figure does not capture.