GadgetFusions Engineering Lab
Free Interactive Hardware Calculators & Spec Analyzers
Skip misleading box numbers. Calculate real-world battery watt-hours and TSA flight legality, projector throw distances, USB-C fast-charge bottlenecks, and display Retina PPI instantly in your browser.
1. Power Bank Real mAh, Charge Count & TSA 100Wh Flight Calculator
Open Power Bank Calculator →Convert mAh to watt-hours (Wh), account for 5V/9V/20V boost conversion loss, and check exact charges for iPhone, Galaxy, Steam Deck, or MacBook.
2. Projector Throw Distance, Screen Diagonal & ANSI Lumen Calculator
Open Projector Calculator →Compute exact wall distance for 80"–150" 16:9 screens and minimum ANSI lumens required for dark bedrooms vs. sunlit living rooms.
3. USB-C Charger, Cable E-Marker & Fast-Charge Bottleneck Checker
Open USB-C Bottleneck Checker →Find out why a 100W GaN charger drops to 27W or 60W—diagnose brick, E-marker cable, and USB-PD / PPS device limits instantly.
4. Monitor, Laptop & AR Glasses PPI + Retina Distance Calculator
Open Display PPI Calculator →Compare pixel density (PPI), dot pitch, and ideal ergonomic eye distance across 1080p, 1440p, 4K, and 5K displays.