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Power Consumption Calculator

Estimate electricity usage in kilowatt-hours (kWh) and calculate monthly appliance electricity bills instantly.

Know the true running cost of every appliance. Instantly.
Common Home Appliances
Estimated Monthly Bill
360 kWh Units
₹2,880.00Consumes 12 units/day at ₹8/unit for 30 days/month
Daily Running Cost
₹96.0012 kWh/day
Annual Electricity Cost
₹35,040.004,380 kWh (365 days)
Monthly Units
360 kWhAt 8h × 30 days
Daily Units
12 kWh1500W × 8 hours

Electricity fact: 1 Unit = 1 kWh (1,000 watts running for 1 hour). 5-star inverter ACs use ~30% less power.

How power consumption is calculated

All results follow from one relationship: energy = power × time. Cost is then energy × tariff.

Formula
kWh per day = (Watts ÷ 1,000) × hours per daykWh per month = kWh/day × days per monthkWh per year = kWh/day × 365Cost = kWh × rate per unit (₹/kWh)

Example — 1,500W AC, 8 h/day, ₹8 per Unit

Wattage
1,500 W
Usage per day
8 hours
Days per month
30
Tariff
₹8 per kWh
kWh per day
1,500 ÷ 1,000 × 8 = 12 kWh
kWh per month
12 × 30 = 360 kWh
kWh per year
12 × 365 = 4,380 kWh
Cost per day
₹96
Cost per month
₹2,880
Cost per year
₹35,040

Annual cost uses 365 days — not monthly × 12

The annual figure is daily kWh × 365, not monthly kWh × 12. At 30 days per month, monthly × 12 gives 360 days — 5 days short of a full year. For this AC running at ₹8/unit, that 5-day gap equals 5 × 12 × ₹8 = ₹480. The calculator uses 365 to correctly represent a full calendar year, regardless of your days-per-month setting.

Last reviewed August 2026

Why Use the Power Consumption Calculator?

  • Accurately forecast monthly electricity bill contributions for any home appliance
  • Calculates exact kWh units consumed per day, month, and full year (365 days)
  • Quick-fill presets for high-power appliances: Air Conditioners, Geysers, Fans, and TVs
  • Supports custom state electricity board tariffs (₹ per unit/kWh)
  • 100% private in-browser computation with zero tracking or data retention

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Frequently Asked Questions

One unit of electricity equals one kilowatt-hour (kWh) — the energy a 1,000-watt device consumes in one hour. Your electricity bill is charged in units (kWh). A 100W bulb running for 10 hours uses 1 kWh = 1 unit. Enter your tariff as ₹ per kWh.

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