Energy and Utility

Calculate the correct air conditioner size and cooling load in BTU/hr for your home. Get instant recommendations for standard AC tonnage based…

Calculate air changes per hour (ACH) and ventilation rates for any room. Enter room dimensions and fan airflow in CFM to get…

Calculate the exact running cost of any appliance per hour, day, or year. Compare energy efficiency, estimate payback periods, and lower your…

Calculate the correct boiler size and BTU input rating for heat-only or combi systems. Get instant recommendations based on your space and…

Calculate the required airflow (CFM) for any room instantly. Enter room dimensions and target air changes per hour (ACH) to determine CFM,…

Calculate your monthly and annual electricity bill with precision. Factor in appliance usage, delivery fees, taxes, and potential solar savings. Try it…

Calculate your exact EV charging costs for home, Level 2, or public chargers. Compare charging vs. gas savings and estimate your total…

Calculate required fire flow in GPM using the NFA fireground formula. Estimate water needs, supply points, ISO figures, and export downloadable PDF…

Find the right furnace size for your home in BTUs. Enter square footage, climate zone, and insulation to avoid buying a furnace…

Free online Gallons Per Minute (GPM) Calculator. Perform a timed fill test to determine water flow rate, tank fill times, and household…

Calculate your backup generator's fuel use and total run time with our free Standby Generator Fuel Consumption & Load Calculator. Input your…

Use our free Heat Loss Calculator to estimate your home's design heat loss in BTU/hr. Input floor area, temperatures, and insulation to…

Calculate how much you can save by switching to a heat pump. Compare heating fuels, factor in tax credits, and estimate payback…

Compare operating costs between heat pumps and gas or oil furnaces with our free calculator. Estimate annual energy expenses, savings, and payback…

Calculate your ideal insulation target and estimated energy savings with our free Home Insulation R-Value Target Calculator. Input your location, current R-values,…

How much will upgrading to LED lights save you? Use our free calculator to compare wattage, estimate payback time, and calculate long-term…

Free online Liters per Minute Calculator. Perform a timed fill test to determine LPM flow rate, tank fill times, and household fixture…

Calculate solar battery storage costs and savings. Factor in the federal tax credit, calculate backup time during power outages, and estimate your…

Calculate solar payback period, federal tax credit savings, and long-term ROI with this easy solar savings calculator.

Calculate your solar panel savings, payback period, and 25-year ROI after federal tax credits. Get your free personalized solar breakdown in seconds!

Free online Tank Volume Calculator. Easily determine full capacity and liquid fill volume in gallons, liters, or cubic feet with printable PDF…

Find the right window AC size in BTUs for any room. Enter room size, sun exposure, and occupants to pick a unit…