Energy Use Intensity (EUI) is measured in kBtu/ft^2/year and is an indicator of the energy efficiency of a building; essentially, the miles per gallon of the building industry.
To convert EUI to energy consumption for the year, a kBtu/year value we simply need to multiply by the area.
For example, if the EUI of a building is 43.56 kBtu/ft^2/year and the building is 37,318 sq. ft., the energy usage would be 1,625,572.08 kBtu/year. Below is what the total EUI will look like in cove.tool's Energy Baseline interface.
To break down the EUI even further to determine how much electricity and gas contribute to the overall EUI, take a look at the following graphic which is also found on the Energy Baseline interface. This graphic breaks down the EUI per end use.
In order to determine the energy use of electricity and gas, you would sum up the end uses that consume electricity and multiply by the square footage to determine the energy used. For example, assuming the project depicted above uses gas for heating and hot water, we would sum up the EUI of the remaining utilities (cooling, lighting, equipment, fans, and pumps) to get 30.93 kBtu/ft^2/year. We would then multiply that value by 37,318 sq. ft. to determine the contribution to the overall energy consumption that electricity has; 1,154,245.74 kBtu/year. We could then easily determine the contribution of gas through the same methodology or by simply subtracting the electrical energy consumption contribution from the overall energy consumption.