Autogas (LPG) Calculator



Autogas calculator gives you the data prediction for saving money with LPG.


Annual Mileage: km


Consumption: L/100km


Conversion Cost:


Cost of Petrol: €/L


Cost of LPG: €/L

Annual Petrol Cost:

2044.80 €

Monthly Petrol Cost:

170.40 €

Annual LPG Cost:

1399.68 €

Monthly LPG Cost:

119.14 €

Annual Service Cost:

30.00 €

Monthly Service Cost:

2.50 €

Savings per 5 Years:

1475.60 €

Monthly Savings:

24.59 €

Return of investment:

31.21 months





The graph shows the cost of Petrol and LPG through a period of five years. The return of investment i.e. the cost of installation of gas system is recovered in 31.21 months - where the lines cross each other. At the end of 5 year period the difference between using gasoline and LPG without unforeseen complications is around 1475.60 € .

Also check these articles:

Hidden costs of LPG conversion

What to consider before LPG conversion





The use of LPG also reduces greenhouse gas emissions. The following graphs show the difference in the quantity of emissions between petrol and LPG used in five year span.


Quantity of CO2 in five year span
Quantity of CO in five year span


Gasoline: 3680.00 kg
LPG: 2880.00 kg

Difference: 800.00 kg


Gasoline: 16.00 kg
LPG: 12.23 kg

Difference: 3.77 kg

Quantity of HC in five year span


Gasoline: 2.58 kg
LPG: 2.04 kg

Difference: 0.54 kg




The perfect calculator for calculating the cost unfortunately does not exist, as the costs vary from car to car. LPG autogas consumption compared to Petrol and the speed of switching between petrol and gas in the cold and warm engine are only two out of many differences, which can make the consumption vary. Because of this problem we used a 20% increase in consumption, which may occur due to fuel energy density, octane level, etc. Different providers have different service intervals for LPG systems, so we added in the calculation lump sum of 30€ per 20.000km.