Code-compliant building materials and equipment will typically have a lower initial cost, however, the lifetime energy savings of the high-efficiency equipment will often justify the upfront cost premium and result in a more cost-effective solution. Energy Savings Calculations for Commercial Building Energy Efficiency Upgrades assists energy professionals, contractors, building owners and managers in developing energy savings estimates that can facilitate a quick assessment of the potential energy savings that might be realized when replacing code-compliant building components with the highest efficiency equipment. It also provides algorithms to estimate greenhouse gas emission reductions that may be achieved by building energy efficiency upgrades and the impact these upgrades can have on building electrification-decarbonization projects.