Electrical Engineering
Power Consumption Calculator
⚡ P = V × I
Calculate power consumption, energy usage, and cost for electrical devices.
Device Details
Device / Appliance
Select a device or choose Custom for manual entry
Voltage (V)
V
Supply voltage (230V typical, 120V US)
Current (I)
A
Current draw in amperes
Power (P)
W
Power consumption in watts (calculated from V×I)
Usage & Cost
Usage Hours per Day
h/day
Active usage hours per day
Standby Power
W
Power consumed when in standby mode
Electricity Rate
$
/kWh
Cost per kilowatt-hour (kWh)
Days Used per Month
days
Number of days the device is used per month
Power
0W
Monthly Energy
0 kWh
including standby
Active Power
0 W
Daily Energy
0 kWh
Monthly Cost
$0
Standby Cost
$0
📊 Detailed Breakdown
| Parameter | Value | Unit |
|---|
How the formula works
P = V × I | Energy (kWh) = Power (kW) × Time (h) | Cost = Energy × Rate
- Power (W) = Voltage (V) × Current (A)
- Active Energy (kWh) = (Power × Hours) / 1000
- Standby Energy (kWh) = (Standby Power × (24 − Hours) × Days) / 1000
- Total Energy = Active Energy + Standby Energy
- Monthly Cost = Total Energy × Electricity Rate
- Standby Cost = Standby Energy × Electricity Rate
- Power factor not included (assumes unity for simplicity)
- Typical standby power: TV (5W), Computer (3W), Charger (1W)