Electricity consumption calculator.
Convert appliance watts and operating hours into daily or monthly kWh and an energy-charge estimate.
Electricity consumption inputs
Tariffs can include slabs, fixed charges, taxes and demand charges that this estimate excludes. Trust level: engineering estimate; verify site and equipment assumptions before purchase or installation.
View detailed breakdown
| Assumption | Value |
|---|---|
| Average appliance power while operating | 100 W |
| Flat energy rate | 8 per kWh |
Method: kWh = watts × quantity × hours × days ÷ 1,000
Inputs used: 100 × 1 × 8 × 30 ÷ 1,000 = 24 kWh
Assumptions: Average appliance power while operating Flat energy rate
Scope and warnings: Tariffs can include slabs, fixed charges, taxes and demand charges that this estimate excludes.
How this electricity consumption calculator works
Energy equals power multiplied by operating time. The tool converts watts to kilowatts, multiplies by appliance count, hours per day and days, then applies the tariff you enter. It keeps energy and money separate.
A worked example
A 100 W appliance running 8 hours daily for 30 days uses 24 kWh. At ₹8 per kWh, the variable energy charge is ₹192 before fixed charges, slabs, duties or taxes.
Why can the bill differ from this estimate?
Real bills may use slab tariffs, fixed charges, taxes, demand charges and meter periods. Appliance power can also cycle. Enter measured average watts when available and compare the result with a recent bill.
Calculations run on your device. Review your results before exporting or sharing them.
Measure time as carefully as power
For appliances that cycle, use average measured power or reduce the equivalent running hours. Build separate calculations for materially different appliances, then add their kWh rather than averaging incompatible wattages.
The cost result applies one flat energy rate. Reconcile it with a bill by keeping fixed charges and taxes outside the model, and use the solar sizing tool only after estimating representative daily demand.
Published by ToolMitra — methods and editorial approach.