Volts to Amps Converter
Determine how many Amperes (A) or Milliamperes (mA) your device pulls when you only know its total wattage and voltage rating, plus calculate recommended power supply headroom.
💡How to Size Your Replacement Power Adapter
If your calculation shows your device needs 2.0 Amps, always choose a power supply rated for 2.0A, 2.5A, 3.0A, or higher. In electrical circuits, Current is PULL, not PUSH — your device will only draw what it requires, and extra amperage headroom ensures the adapter runs cool and lasts for years.
Check complete adapter compatibility
Verify voltage tolerance, current headroom, polarity, and plug dimensions before powering your device.
Run Full Compatibility CheckerRelated Calculators & Checkers
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DC Barrel Connector Finder
Filter DC coaxial barrel plugs by outer/inner diameter (OD/ID) with live cross-section diagram.
DC Polarity Checker & Decrypter
Verify Center Positive (⊕) vs Center Negative (⊖) symbols and avoid instant reverse-polarity blowouts.
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DC Wire Gauge (AWG) Sizer
Calculate wire loop resistance, voltage loss, and safe ampacity for 5V, 12V, and 24V circuits.