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Solar, EV & Home Energy Calculators & Converters
Solar, EV & Home Energy Calculators & Converters
Home energy audit, appliance cost, HVAC load, insulation, and generator sizing calculators for homeowners working to understand and lower their energy costs.
Who This Is For
A utility bill is a lump. These six calculators split it into the questions a homeowner, an auditor, or a student can actually act on: how the whole house compares with a benchmark, what a single appliance costs to run, how much heating and cooling the building needs, what insulation is doing, what size generator covers a chosen set of loads, and what an outage actually costs in food, lodging, and lost work. EnterPlanet LLC built the set so those questions stay on separate pages with visible formulas. Home-energy benchmarks follow ENERGY STAR figures already named on the About page. Read the full guide ↓
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The Home Energy Audit Calculator turns floor area, climate, and fuel into an intensity number you can compare with typical homes, plus a rough split of where energy goes. It is a screening tool, not a blower-door test. The Appliance Energy Cost Calculator is the next step down: wattage, hours, duty cycle, and your rate, including the difference between nameplate watts and running at a fraction of capacity. Run the audit first so you know whether the expensive line on the bill is HVAC, water heating, or a garage freezer. Then price the appliance.
The HVAC Load Calculator estimates heating and cooling load from floor area, climate zone, and construction. It is not a full Manual J. It is a first pass so you do not buy a five-ton unit for a tight house or a two-ton unit for a leaky one. The Insulation R-Value Calculator stacks layers and climate-zone targets so you can see why adding a layer to an already insulated wall returns less than sealing and insulating an empty attic. Load and R-value belong together: a load calculation that assumes R-38 when the attic is R-11 will undersize the problem and oversize the equipment.
The Generator Sizing Calculator separates running watts from starting watts. Motors — well pumps, air conditioners, refrigerators — need a starting surge that a machine sized only on running watts cannot supply. Fuel runtime is optional and stays behind a form drawer because it is extra input, not teaching. The Power Outage Cost Calculator estimates spoiled food, lodging, generator fuel, and lost remote-work time so you can tell whether a portable generator, a standby generator, or a battery backup is even in the right cost neighborhood. Size first, then cost. Buying a generator from a round number on a box, then discovering starting watts later, is the usual miss.
If you have a bill in hand, start with Energy Audit, then Appliance Cost or HVAC Load depending on what the audit points at. If you are remodeling, start with R-Value and HVAC Load. If you are preparing for storms, start with Generator Size and Outage Cost. None of these pages is a permit, a Manual J, or a load letter for a utility. They are the math before you call the person who writes those documents. Use the related-tool links on each page so insulation, load, and backup stay one design instead of three shopping trips.
ENERGY STAR figures on this site are screening benchmarks, not a certified home rating. An audit calculator will not find a duct leak. An R-value stack will not replace a blower door. A generator sized here still needs a transfer switch and an electrician who will stand behind the install. If a default or a formula looks wrong, use Contact. EnterPlanet LLC would rather correct the page than leave the teaching shut.