Calculating your annual saving with EV is straightforward once you know the EV vs Petrol Cost formula and what each input means. This guide explains the method in plain language, walks through a manual calculation, and gives worked examples you can follow — then you can do it instantly with the EV vs Petrol Cost Calculator.
What is EV vs Petrol Cost?
The EV vs Petrol Cost calculation tells you your annual saving with EV from a few simple inputs. The figure you are solving for here is the annual saving with EV, expressed in INR.
The EV vs Petrol Cost formula
The core formula is:
Annual saving with EV = Annual distance ÷ Petrol car efficiency × Petrol price - Annual distance ÷ 100 × EV consumption × Electricity rateHere is what each input means:
- Annual distance — a value measured in km. Example: 15,000 km.
- EV consumption — a value measured in kWh/100km. Example: 16 kWh/100km.
- Electricity rate — a money amount. Example: ₹8.
- Petrol car efficiency — a value measured in km/l. Example: 15 km/l.
- Petrol price — a money amount. Example: ₹100.
How to calculate it step by step
- Write down the annual distance (for example, 15,000 km).
- Write down the ev consumption (for example, 16 kWh/100km).
- Write down the electricity rate (for example, ₹8).
- Write down the petrol car efficiency (for example, 15 km/l).
- Write down the petrol price (for example, ₹100).
- Apply the formula above to get your annual saving with EV.
- Double-check the result with the EV vs Petrol Cost Calculator.
Worked examples
Example 1
| Input / Output | Value |
|---|---|
| Annual distance | 15,000 km |
| EV consumption | 16 kWh/100km |
| Electricity rate | ₹8 |
| Petrol car efficiency | 15 km/l |
| Petrol price | ₹100 |
| Annual saving with EV | ₹80,800 |
| EV running cost | ₹19,200 |
| Petrol running cost | ₹1,00,000 |
With annual distance of 15,000 km, ev consumption of 16 kWh/100km, electricity rate of ₹8 and petrol car efficiency of 15 km/l, the annual saving with EV works out to ₹80,800.
Example 2
With annual distance of 30,000 km, ev consumption of 16 kWh/100km, electricity rate of ₹8 and petrol car efficiency of 15 km/l, the annual saving with EV works out to ₹1,61,600.
| Result | Value |
|---|---|
| Annual saving with EV | ₹1,61,600 |
| EV running cost | ₹38,400 |
| Petrol running cost | ₹2,00,000 |
Example 3
With annual distance of 7,500 km, ev consumption of 16 kWh/100km, electricity rate of ₹8 and petrol car efficiency of 15 km/l, the annual saving with EV works out to ₹40,400.
| Result | Value |
|---|---|
| Annual saving with EV | ₹40,400 |
| EV running cost | ₹9,600 |
| Petrol running cost | ₹50,000 |
Tips for an accurate result
- Keep your units consistent — mixing, say, months with years or grams with kilograms is the most common source of error.
- Round only at the very end. Rounding inputs early can shift the final answer noticeably.
- Re-run the numbers whenever an input changes, rather than estimating from an old result.
Prefer not to do the maths by hand? — the EV vs Petrol Cost Calculator does it instantly, for free, with the formula and a worked example built in.
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