Estimate kWh and cost from watts, hours per day, days, and average price per kWh at roughly constant power.
Good fits
Heaters and desktops near rated wattage. Fridges and A/C cycle on/off—use realistic run hours.
Tiered tariffs
Single average rate only—not a utility bill replica.
Energy units
Energy converter for kWh vs joules.
Related
Frequently asked questions
How is electricity cost estimated?
kWh ≈ watts × hours/day ÷ 1000 × days, then × price per kWh at constant power.
1500 W for 3 h/day—kWh?
1500 × 3 ÷ 1000 = 4.5 kWh/day. Multiply by days and rate for cost.
Tiered rates?
Not modeled—use an average ¢/kWh or split tiers manually.
Energy unit converter?
See the energy converter for kWh vs joules; this page targets bill estimates.
Watts vs kilowatts?
Enter watts; 1.2 kW → 1200 W.
A/C all night?
Use realistic compressor run hours, not rated W × all night.
What does 30 days mean?
A 30-day window at the same daily pattern—align with your billing cycle.
Can I save my inputs?
Yes. Copy link below the form keeps your current inputs so you can share the scenario or save it for later.