Electricity & energy
Appliance Power Consumption Calculator
Estimate appliance energy use and running costs from wattage, usage and your tariff.
- 27 appliance presets
- Daily to yearly cost
Electricity & Energy Tools
Every home energy question starts with watts and ends with a bill. These free browser calculators cover the full chain: from measuring individual appliance consumption, through estimating AC running costs and total electrical load, to understanding your electricity bill, scheduling appliances around time-of-use rates, sizing battery backup systems and evaluating solar payback.
All calculations run locally in your browser. No uploads, no accounts, no sign-ups.
Available tools (9)
Electricity & energy
Home Electricity Usage Calculator
Add multiple appliances to estimate household electricity use, monthly cost, and your biggest energy users.
- Multiple appliance tracking
- Monthly cost & kWh breakdown
Electricity & energy
AC Running Cost Calculator
Estimate air-conditioner running costs from BTU rating, efficiency, usage and electricity rate.
- BTU + EER/SEER inputs
- Hourly to yearly cost
Electricity & energy
Electricity Bill Calculator
Estimate a bill from meter readings or kWh, tariff, fixed charges and tax.
- Meter readings or kWh
- Itemised bill breakdown
Electricity & energy
Time-of-Use Electricity Cost & Appliance Scheduler
Map peak and off-peak rates, schedule appliances, and find cheaper hours to use electricity.
- Peak and off-peak rates
- 18 appliance presets
Electricity & energy
Household Electrical Load Compatibility Checker
Total appliance wattage and check amperage, circuit capacity and breaker sizing.
- 120V & 230V systems
- 80% load rule
Electricity & energy
Battery Backup Time & Inverter Size Calculator
Estimate battery runtime or size a battery bank and inverter for household appliances.
- 20 appliance presets
- Lead-acid and lithium
Electricity & energy
Solar Savings & Payback Calculator
Estimate solar production, electricity savings and the break-even payback period.
- Annual production and savings
- Payback and lifetime view
Electricity & energy
EV Home Charging Cost Calculator
Calculate the true cost to charge your electric car at home — per session, monthly, and annual impact on your electricity bill.
- 20 EV battery presets
- Level 1, 2 and 3 charging
How these tools connect
Start with measurement: the Appliance Power Consumption Calculator turns wattage and usage hours into kWh and cost for a single device. To see the full picture across your household, the Home Electricity Usage Calculator combines multiple appliances and shows which ones contribute most to your bill. For air conditioning specifically, the AC Running Cost Calculator derives power from BTU/h and EER or SEER efficiency, then gives hourly, daily, monthly and seasonal estimates.
Total your load: the Household Electrical Load Compatibility Checker adds up all your appliances and checks whether your circuits and breakers can handle the combined draw.
Understand your bill: the Electricity Bill Calculator turns meter readings or kWh into an itemised bill with tariff, fixed charges and tax. The Time-of-Use Electricity Cost & Appliance Scheduler maps peak, standard and off-peak rates to your appliance schedule and shows the cheapest time to run each one.
Plan ahead: the Solar Savings & Payback Calculator estimates rooftop solar production, annual savings and break-even period. The Battery Backup Time & Inverter Size Calculator estimates how long a battery will power your appliances or helps you size a battery bank and inverter.