Energy Efficiency Calculator

Calculate consumption and class from electricity and gas bills

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STEP 1. ENTER DATA

Annual consumption - from electricity and gas bills. Area - from apartment documents.

Annual consumption (kWh)

Area (m²)

ENERGY CLASS:

A building's energy class is determined by its annual energy consumption per m². Lower consumption means a higher class (A is best, G is lowest).

Class?? kWh/m²/year

ABCDEFG

A building's energy class is determined by its annual energy consumption per m². Lower consumption means a higher class (A is best, G is lowest).

Where to get the data

Annual consumption (kWh) - from electricity and gas bills for the year. Add meter readings or kWh from invoices. If heating is gas - add gas (convert m³ to kWh using the factor on your bill, usually ~10 kWh/m³).

If you have an energy certificate or passport - it may list specific consumption (kWh/m²/year) directly.

Calculation formula

Specific consumption = Annual consumption (kWh) ÷ Area (m²). Unit: kWh/m²/year. EN 15217 standard.

Class	Consumption (kWh/m²/year)
A	up to 50
B	50 - 90
C	90 - 150
D	150 - 230
E	230 - 330
F	330 - 450
G	over 450