Audit electricity, fuels, demand, and operating hours confidently. Model retrofit savings and payback fast today. Turn building data into practical actions that reduce waste.
Annual electricity = Monthly electricity × 12
Annual gas energy = Monthly gas × 12 × 29.3001
Annual diesel energy = Monthly diesel × 12 × 10.72
Weighted electric reduction = Σ(end-use share × reduction)
Annual utility cost = Energy charges + demand charges
EUI = Annual site energy ÷ building area
Simple payback = Net investment ÷ total annual savings
ROI = Total annual savings ÷ net investment × 100
This tool blends electricity, gas, and diesel into one site-energy view, then compares baseline and projected performance after selected efficiency measures.
| Measure | Scope | Baseline Use | Reduction | Estimated Savings | Comment |
|---|---|---|---|---|---|
| LED Lighting Retrofit | Office and warehouse | 126,000 kWh/year | 22% | $4,620/year | Improves lighting efficacy and lowers cooling load. |
| HVAC Controls Upgrade | Packaged units and chillers | 176,400 kWh/year | 16% | $3,952/year | Better scheduling and setpoints reduce peaks. |
| Compressed Air Leak Repair | Production area | 50,400 kWh/year | 10% | $706/year | Targets avoidable runtime and unnecessary cycling. |
| Boiler Tune-Up | Process hot water | 7,200 therms/year | 12% | $950/year | Raises combustion efficiency and trims losses. |
It estimates annual site energy, utility cost, EUI, emissions, savings, payback, and ROI. It combines electricity, gas, and diesel, then applies projected improvement percentages to model post-upgrade performance.
End-use shares distribute electric consumption across lighting, HVAC, equipment, and other loads. That lets the calculator apply different retrofit savings to each category instead of using one blanket assumption.
The calculator automatically normalizes them. This keeps the model usable while preserving your proportions. A note appears in the results so you know the shares were adjusted before calculations.
Yes. Annual electricity cost includes energy charges and a demand charge based on peak kilowatts. This is helpful for projects that reduce peak demand, not just total kWh.
Yes. Enter your own electricity, gas, and diesel factors. That makes the emission result more representative of your grid mix, fuel quality, and reporting framework.
No. Simple payback is useful for screening, but final decisions should also consider lifecycle cost, downtime risk, maintenance impact, reliability, and financing structure.
Electricity is entered in kWh, gas in therms, diesel in liters, area in square meters, and demand in kW. Outputs include kWh, EUI, currency, and tonnes of CO₂e.
No. It is a planning and screening tool. A full audit still needs measured profiles, equipment inventories, field observations, and verified operating conditions.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.