To audit appliance & household electricity:
Use the Electricity Usage Calculator to tally daily, monthly, and annual kWh across appliances, or the Appliance Wattage Calculator to look up typical device watts.
Household Energy & Cost Planning
Home Energy Calculators
Calculate electricity usage by appliance or whole home, estimate monthly electric bills with standing charges and tiered rates, find appliance running watts, and size home battery storage.
Available home energy calculators
Home Energy💡
Electricity Usage Calculator
Watts • Daily & Monthly kWh
Estimate daily, monthly and annual electricity use from appliance power, schedules, cycles or energy-label values.
Explore Electricity Usage Calculator
Home Energy💵
Energy Bill Calculator
Cost • Tiered Rates • Standing Fee
Estimate an electricity bill from your usage, electricity price and optional fixed or standing charges.
Explore Energy Bill Calculator
Home Energy🏡
Home Battery Size Calculator
kWh • Whole-Home Outage Backup
Estimate home battery capacity from household energy, backup scope and outage duration with transparent planning assumptions.
Explore Home Battery Size Calculator
Home Energy🔌
Appliance Wattage Calculator
Volts • Amps • Surge Power
Estimate running watts from an editable preset or appliance label, then calculate energy use for a selected runtime.
Explore Appliance Wattage Calculator
Home Energy⚙️
Generator Size Calculator
Starting & Running Watts • Outage
Calculate generator running and starting wattage requirements for storm outages and emergency home backup.
Explore Generator Size Calculator
Home Energy🌬️
Air Conditioner Cost Calculator
SEER2 • BTU • Hourly & Monthly Cost
Estimate hourly, monthly, and full-season air conditioning electricity costs for window units, mini-splits, and central AC.
Explore Air Conditioner Cost Calculator
Home Energy🔥
Space Heater Cost Calculator
500W–1500W • Overnight 8h • Cost
Calculate operating costs per hour, per 8-hour night, and per winter month for electric space heaters and radiators.
Explore Space Heater Cost Calculator
Home Energy🔄
Heat Pump Running Cost Calculator
COP vs Gas/Oil/Propane • Annual ROI
Compare annual running costs of an electric heat pump against natural gas, propane, and fuel oil heating systems.
Explore Heat Pump Running Cost Calculator
⚡
Residential Electrical Distribution & Load Hierarchy
Grid utility supply and subpanel distribution across continuous, heavy-cycling, and essential circuits.
🏭SupplyUtility Grid / Solar240V Split-Phase Service
⚡DistributionMain Service Panel100A / 200A Main Breaker
🛡️ProtectionBranch BreakersCircuit Protection & Continuous-Load Considerations
❄️High DrawMajor 240V LoadsHVAC, Water Heater, Range
💡Base DrawGeneral 120V LoadsLighting, Refrigerator, Electronics
Engineering Principle: High-power heating, cooling, water-heating, and charging equipment can contribute substantially to household electricity consumption, depending on equipment efficiency and operating schedule.
Interactive Planning Journey
Recommended Home Energy Engineering Workflow
Follow our 4-step workflow to audit household electrical demand, calculate utility costs, and engineer home backup resilience:
1
🔌Lookup Device Wattages
Step 1 • Power Draw
Estimate continuous and starting surge watts from appliance labels or presets.
Launch Step 1
2
📊Audit Energy Usage (kWh)
Step 2 • Energy Audit
Tally appliance schedules, duty cycles, and monthly household consumption.
Launch Step 2
3
💵Estimate Electricity Bills
Step 3 • Bill Analysis
Calculate monthly electric utility costs with standing charges, tiers, and tax.
Launch Step 3
4
🔋Size Home Battery Backup
Step 4 • Home Storage
Size residential battery capacity for critical essentials or 100% whole-home backup.
Launch Step 4
📜
Engineering Standards & Technical Methodology References
Calculations, electrical losses, and design safety margins adhere to recognized engineering guidelines:
NEC Article 220Branch-Circuit, Feeder, and Service Load Calculations• National Electrical Code (NFPA 70)
Authoritative demand factors and continuous load ratings for residential electrical services.
ANSI / ASHRAE 90.2Energy-Efficient Design of Low-Rise Residential Buildings• ASHRAE
Baseline energy modeling standards for residential appliance loads, HVAC, and thermal envelopes.
ENERGY STAR V8Appliance Energy Efficiency Criteria• U.S. Environmental Protection Agency (EPA)
Standardized duty-cycle consumption benchmarks for residential refrigeration, laundry, and computing.
Which home energy tool should I use?
To estimate electric bills & utility costs:
Use the Energy Bill Calculator to calculate total bills from your energy rate ($/kWh), standing daily charges, and local sales tax.
For storm outages, generators & battery backup:
Use the Generator Size Calculator to calculate running and motor surge watts for portable/standby generators, or the Home Battery Size Calculator to plan whole-home storage.
To calculate AC cooling electricity costs:
Use the Air Conditioner Cost Calculator to estimate hourly, monthly, and seasonal electric bills for window units, mini-splits, and central AC systems.
To analyze winter space heaters vs heat pumps:
Use the Space Heater Cost Calculator to compute electric heater running costs, or the Heat Pump Cost Calculator to compare heat pump operating savings against gas, propane, and fuel oil.
Featured Home Energy Guides & Open Datasets
Explore our empirical reference guides, open benchmark datasets, and peer-reviewed technical whitepapers for residential electricity audits, heat pump thermodynamics, and emergency generator sizing:
📊 Dataset: Central AC & Heat Pump SEER2 Benchmark (PL-DS-AC-04)📊 Dataset: Motor Starting Surge & Inrush Benchmark (PL-DS-GEN-04)🔬 Research: Heat Pump COP Degradation & Aux Heat Kinetics🔬 Research: Motor Inrush Load Stacking & Generator Sizing❄️ Central AC & Heat Pump Cost (SEER2) Guide🔥 Space Heater Electricity Cost & Wattage Guide📊 How Many kWh Does a House Use Per Day Guide⚡ Emergency Generator Sizing & Motor Inrush Guide📊 All Open Benchmark Datasets📚 All Engineering Guides
Transparent household energy accounting
Our home energy models separate continuous running load from peak connected load, accounting for duty cycles, standby power, and seasonal heating/cooling variance. Review our engineering standards, browse the calculators directory, inspect our methodology, or examine sources.