Free online tools for IoT engineers and electronics developers — calculate, convert, simulate, debug
Online parallel resistor calculator with multi-resistor support, current analysis, and reverse calculation
Online LC resonant frequency calculator with L/C to frequency and frequency to L/C modes
Comprehensive online unit converter supporting length, temperature, weight, voltage, current, power, frequency, data storage, angle, and pressure
Online binary/octal/decimal/hexadecimal converter with RGB color conversion and quick presets
Free online Body Mass Index calculator with WHO/Asian/Chinese standards, metric and imperial units
Online CRC checksum calculator supporting CRC-8/16/32/Modbus/CCITT/DNP and custom polynomials
Online OLED display pixel-level simulator with adjustable PPI, font size, and light theme
Online MD5/SHA-1/SHA-256 hash calculator with text, hex input and file upload support