Electricity
Volt Watt Amp Calculator
Use two known values to calculate the missing one.
Last updated: April 2026
Enter any two values to calculate the third.
Why this is valuable
Basic power math gets searched constantly because people need to compare adapters, appliances, LED loads, batteries and workshop electronics. Most visitors are not looking for theory. They want the number.
This version keeps it intentionally simple. It is useful for quick checks, but it is not a replacement for full AC power-factor calculations or local electrical code.
Typical use cases
- adapter checks
- device power draw
- LED and hobby electronics
- battery planning