Formula: Watts = Amps × Volts (W = A × V)
Amps to Watts Calculator
Convert Current (Amperes / A) and Voltage (Volts / V) into total electrical power capacity in Watts (W).
Try Common Adapters:
A
V
Total Power Capacity
30 W
2.5 A × 12 V = 30 Watts
Preventing Adapter Overheating
Running an adapter at 100% wattage for hours causes thermal stress. A 24W device on a 30W adapter will run comfortably cool.
Direct Current Efficiency
DC barrel power supplies convert AC with 85–92% efficiency. The output rating (Watts = V × A) represents the clean DC deliverable to your device.
Check complete adapter compatibility
Verify voltage, current headroom, polarity, and connector fit before connecting any power supply.
Run Full Compatibility Checker