Free tech tools
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Battery Life CalculatorRuntime from mAh, and real power-bank charges.Download Time CalculatorHow long a file takes at your Mbps.Internet Speed Needs CalculatorThe Mbps your household really needs.LED Resistor & Ohm's Law CalculatorRight resistor for LEDs and sensors.Password Strength CheckerPrivate check: entropy and weak patterns.Screen PPI CalculatorPixel density and the distance pixels vanish.Storage Size Converter (GB vs GiB)Why 1 TB shows as 931 GB, and what fits.