What is Petrol vs Diesel Cost Calculator?
Petrol vs Diesel Cost Calculator helps you compare petrol and diesel fuel costs and a fuel-only purchase-cost payback.
The main result is annual diesel fuel saving, with a breakdown of petrol annual fuel cost, diesel annual fuel cost and fuel-only payback. The formula, example and assumptions below explain how to interpret it.
How to use Petrol vs Diesel Cost Calculator
Use the example to get familiar with the form, then enter your own figures. Any rates in the example are illustrative. Check the field labels and units before calculating.
- Gather annual driving distance (km), petrol mileage (km/litre), petrol price per litre (₹), diesel mileage (km/litre), diesel price per litre (₹) and extra upfront cost of diesel (₹). Use values from the same situation or reporting period.
- Replace the example annual driving distance with your own value, then complete the other fields. Check the displayed units.
- Select Calculate and read annual diesel fuel saving with its result breakdown. Change one input and calculate again to compare a second scenario. Reset restores the original example.
- Enter annual driving distance in km, at least 0. Decimals are accepted.
- Enter petrol mileage in km/litre, at least 0.001. Decimals are accepted.
- Enter petrol price per litre in ₹, at least 0. Decimals are accepted.
- Enter diesel mileage in km/litre, at least 0.001. Decimals are accepted.
- Enter diesel price per litre in ₹, at least 0. Decimals are accepted.
- Enter extra upfront cost of diesel in ₹, at least 0. Decimals are accepted.
Petrol vs Diesel Cost Calculator: a worked example
With the inputs below, the result is ₹32,500 (annual diesel fuel saving). Follow the example, then replace these illustrative values with your own.
| Input or output | Example value |
|---|---|
| Annual driving distance (km) | 15,000 km |
| Petrol mileage (km/litre) | 15 km/litre |
| Petrol price per litre (₹) | ₹100 |
| Diesel mileage (km/litre) | 20 km/litre |
| Diesel price per litre (₹) | ₹90 |
| Extra upfront cost of diesel (₹) | ₹1,50,000 |
| Annual diesel fuel saving | ₹32,500 |
| Petrol annual fuel cost | ₹1,00,000 |
| Diesel annual fuel cost | ₹67,500 |
| Fuel-only payback | 4.615385 years |
Understanding the Petrol vs Diesel Cost result
Read annual diesel fuel saving alongside petrol annual fuel cost, diesel annual fuel cost and fuel-only payback. These describe different parts of the same calculation.
Displayed results use a readable number of decimal places. When checking a result by hand, keep extra precision until the last step. To compare scenarios, change one input at a time and keep the others fixed.
- Example Petrol annual fuel cost: ₹1,00,000
- Example Diesel annual fuel cost: ₹67,500
- Example Fuel-only payback: 4.615385 years
Petrol vs Diesel Cost Calculator: assumptions and common mistakes
A useful estimate starts with the right inputs. Check the following assumptions and limits before applying the result to your situation.
- Use mileage from comparable driving conditions. A fuel-only comparison excludes financing, maintenance and resale unless those amounts are specifically entered.
For wider guidance, visit Bureau of Energy Efficiency. The formula and scope of this specific tool are stated on this page.
