To audit appliance & household electricity:
Use the Electricity Usage Calculator to tally daily, monthly, and annual kWh across appliances or build a whole-home profile.
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
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 & costs:
Use the Energy Bill Calculator to calculate total bills from your energy rate ($/kWh), standing daily charges, and local sales tax.
For appliance ratings & home backup sizing:
Use the Appliance Wattage Calculator to look up typical device watts, or the Home Battery Size Calculator to plan emergency backup kWh.
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 methodology and sources.