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
Daily Utility Lab · 16 calculators
Electricity, appliance energy & running cost calculators.
Understand how much electricity your home uses, what each appliance costs to run, and where you can save — transparent formulas, local inputs, no sign-up.
New energy tool
Find Out Why Your Electricity Bill Has Increased
Compare two bills side by side to separate extra usage from a longer billing period, a different cost per unit or changed charges — with a printable diagnostic report.
- inputs stay local
- watts × h ÷ 1000 = kWh
- analytics only with consent
New · AI & developer tools
What does your AI stack cost each month?
Compare input, output and total monthly cost across eight 2026 models — GPT-6 Astra, Claude Opus 5, Gemini 3.8 Flash, Qwen3.7 Flash and more — priced in tokens or words.
- Tokens and words, either way round (1 word ≈ 1.33 tokens)
- Cheapest-model badge on every estimate
- Inputs stay in your browser, like every tool here
Featured · Backup power
How long will the power stay on?
Build your outage load with real duty cycles and starting surges, then see backup time — or size the battery bank and inverter for the hours you need. LiFePO4 and lead-acid, Ah or Wh.
- Two modes: runtime from a bank, or full system sizing
- Surge and inverter efficiency included in every estimate
- Free, private, and instant in your browser
Popular energy tools
Start with an appliance, an air conditioner, or the figures on your electricity bill.
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
Battery Backup Time & Inverter Size Calculator
Estimate battery runtime or size a battery bank and inverter for household appliances.
- Duty-cycle & surge aware
- LiFePO4, AGM/gel & flooded
Learn about electricity.
Use the guides to understand the units, assumptions and household choices behind each estimate.
How Many Watts Does a Refrigerator Use? Typical Consumption Explained
Running vs start-up watts, typical daily kWh by fridge size, and the factors that quietly raise a fridge's running cost month to month.
Read guide10 Practical Ways to Reduce Your Home Electricity Bill
The biggest savings come from heating, cooling, water heating and standby loads — not from unplugging phone chargers. Ten practical, low-effort changes.
Read guideInverter vs Non-Inverter AC: Which Saves More on Electricity Bills?
A straight comparison of running costs, purchase prices and payback periods — with a framework you can apply to your own household.
Read guidekWh vs kW: What's the Difference and Why It Matters
kW is power, kWh is energy. Understand both units and never misread a bill or a device label again.
Read guidePrivacy tools
A smaller set of local tools for removing hidden metadata and checking images before sharing.
Metadata & privacy
File Metadata Sanitizer
Remove hidden EXIF, GPS, camera and author metadata from files in your browser.
- Photos, GIFs and PDFs
- No file upload
Metadata & privacy
Screenshot Privacy Checker
Scan screenshot text for sensitive information and redact it before sharing.
- 12 privacy categories
- Risk classification
Useful numbers.
Visible reasoning.
Every energy estimate states its units, formula, assumptions and limits so you can check the result against your own bill.
How the lab worksTurn appliance power and runtime into kWh before applying your tariff.
See hourly, daily, monthly and yearly estimates in the same calculation.
Test efficient appliances, off-peak schedules, solar and backup-power choices.