How to calculate your EV break-even point step by step

What is a break-even point and why does it matter?

The break-even point is the moment when the total money you have spent on your EV equals what you would have spent owning a comparable petrol car over the same period. Before that point, the petrol car was technically cheaper. After it, the EV is saving you money every day. Knowing this number helps you decide whether switching makes financial sense for your situation.

Step one: gather your numbers

Before you can calculate anything, you need a set of inputs. Do not guess these if you can avoid it. Accurate numbers give you a meaningful result. Vague estimates give you a vague answer.

• Purchase price of the EV you are considering
• Purchase price of the petrol alternative you are comparing it to
• Your average annual driving distance in kilometers or miles
• Your local petrol price per liter or gallon
• Your electricity rate per kWh, including any off-peak tariffs you plan to use
• The fuel consumption of the petrol car in liters per 100 km
• The energy consumption of the EV in kWh per 100 km
• Estimated annual maintenance costs for each vehicle
• Any government grants or tax incentives that reduce the EV purchase price

Step two: calculate annual running costs for each vehicle

Multiply your annual distance by the per-kilometer fuel cost of each vehicle. For the petrol car, divide your liters per 100 km by 100, then multiply by kilometers driven and by the price per liter. For the EV, do the same using kWh per 100 km and your electricity rate. Add estimated maintenance costs for each. The difference between those two annual totals is your yearly saving.

Step three: account for the price premium

Subtract any incentives, grants, or rebates from the EV purchase price before comparing it to the petrol car. In some markets, these incentives are substantial enough to eliminate the price premium entirely, which means the EV starts saving money from day one.

Step four: divide the premium by the annual saving

Take the remaining price difference between the two vehicles and divide it by your calculated annual saving. The result is your break-even period in years. If that number is less than how long you intend to keep the car, the EV makes financial sense. If it is longer, you may not recoup the extra cost before you sell or trade in.

Using a calculator instead of doing it manually

Manual calculations work, but they require careful attention to get right. A dedicated calculator handles the arithmetic for you and lets you adjust variables instantly to see how sensitive your break-even point is to changes in petrol prices or electricity rates. Our tool at the top of this page is built specifically for this comparison and takes only a couple of minutes to fill in.