Laptop Charger Compatibility Checker
Need a replacement charger for your laptop? Verify whether a spare Dell, HP, Lenovo, Apple, or universal USB-C brick has enough wattage, the correct voltage (19V vs 19.5V), and matching connector smart pins.
Laptop Requirements
Your laptop's factory input specifications
Replacement Charger
The spare power brick you want to test
💡Laptop Power Rules & Engineering Gotchas
19.0V and 19.5V operate across the standard DC rail tolerance (±2.6%). A 19.5V Dell/HP charger will safely power a 19.0V Asus/Acer motherboard provided the connector matches.
Dell and HP laptops use an internal middle needle pin (1-Wire protocol) to identify charger wattage. If using a mismatched or unapproved adapter, the laptop powers on but disables battery charging.
Using a 90W, 100W, or 130W charger on a 65W laptop is fully compatible and safe under normal operating conditions. The laptop's internal buck converter draws only the current it needs, and the charger runs cooler.
Check complete adapter compatibility
Verify voltage tolerance, wattage headroom, polarity, and DC tip dimensions across all your home and office electronics.
Run Full Compatibility CheckerRelated Calculators & Checkers
Mobile Phone Charger Checker
Can you use a 65W/100W laptop charger on your phone? Check iPhone, Galaxy, and Pixel charging speeds.
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.
Voltage Calculator & Drop Analyzer
Calculate voltage discrepancy against standard regulation margins and DC cable loss over distance.
DC Wire Gauge (AWG) Sizer
Calculate wire loop resistance, voltage loss, and safe ampacity for 5V, 12V, and 24V circuits.
Current & Splitter Load Sizer
Size adapters with the 80% continuous duty safety rule and sum multi-device splitter loads.