Appliance Wattage Calculator
Estimate electricity costs and energy usage for household appliances. Enter wattage or amps/voltage to see daily, monthly, and yearly totals.
Tip
Look for the wattage printed on the appliance label or multiply volts × amps from the nameplate.
Energy Usage
Daily 2.7 kWh
Monthly 81 kWh
Yearly 972 kWh
Estimated Cost
Monthly $14.58
Yearly $174.96
Carbon Impact
CO₂ Emissions ~405.32 kg/year
Moderate power device. Matching usage hours to your needs can trim monthly costs.
How to Use This Calculator
Gather appliance ratings
Find the wattage label or note the amperage and voltage printed on the appliance.
Enter usage patterns
Estimate average hours used per day and how many days per month the appliance runs.
Review energy, cost, and carbon
Use the results to compare appliances, plan electricity budgets, or justify upgrades.
Formula
Watts = Volts × Amps
Energy (kWh) = (Watts ÷ 1000) × Hours
Cost = Energy × Cost per kWh
Example: 900 W microwave used 0.3 hrs/day → 0.27 kWh/day → 8.1 kWh/month. At $0.18/kWh ≈ $1.46/month.
Example: 7.5 A at 120 V space heater → 900 W. Running 5 hrs/day costs ≈ $24/month at $0.18/kWh.
About the Appliance Wattage Calculator
Understanding electricity consumption empowers you to lower utility bills and shrink your carbon footprint. This calculator turns appliance specs into actionable insights.
When to Use This Calculator
- Budgeting: Estimate monthly costs for new appliances before buying.
- Energy audits: Identify which devices consume the most electricity.
- Solar planning: Compare loads when sizing solar or backup battery systems.
- Eco-conscious living: Track the CO₂ impact of everyday appliances.
Why Use Our Calculator?
- ✅ Flexible inputs: Enter wattage or volts/amps depending on the label available.
- ✅ Usage-aware: Adjust hours and days to match real-world habits.
- ✅ Cost + carbon: Quantify both financial and environmental impacts.
- ✅ Mobile friendly: Check energy costs while shopping in-store.
Common Applications
Homeowners: Justify upgrading to Energy Star appliances.
Renters: Monitor plug-in space heaters or AC units to stay within budget.
Facility managers: Identify high-consumption equipment and schedule maintenance.
Tips for Best Results
- Measure actual use with a watt meter for the most accurate numbers.
- Compare peak vs off-peak electricity rates if your utility offers time-of-use pricing.
- Consider standby power—many electronics draw 1–5 W even when “off.”
- Re-evaluate usage seasonally for appliances like heaters or holiday lighting.
Frequently Asked Questions
What is kWh?
A kilowatt-hour is one kilowatt of power used for one hour. Utility bills are based on total kWh consumed.
Does voltage matter?
Yes. Appliances with higher voltage or amperage draw more power. Multiply volts × amps to find wattage.
How accurate is the CO₂ estimate?
It uses an average emissions factor. Replace it with your utility’s figure for region-specific accuracy.
Can I use this for battery-powered devices?
Yes. Convert the battery’s watt-hour rating to kWh and divide by your charging efficiency to estimate electricity use.