Embedded engineering calculators
Enter the values from a frame, board, panel, or encode plan. Get deterministic results with formula notes, test vectors, and links to the adjacent checks engineers usually need next.
CRC and bus calculations that firmware engineers search for when debugging real device traffic. Browse embedded protocol tools.
Calculate CRC-16/Modbus from ASCII or hex bytes and append the RTU low-byte/high-byte checksum to a request frame.
Find the safe I2C pull-up resistor window from NXP timing formulas and choose a standard E12 value.
Calculate CAN bus bit timing from controller clock, prescaler, propagation segment, phase segments, SJW, and target bitrate.
Calculate Wi-Fi PHY data rate from MCS, channel width, spatial streams, and guard interval, then estimate MAC goodput from airtime overhead.
Find STM32 timer prescaler and auto-reload values for a target frequency, including APB prescaler timer clock behavior.
Bandwidth and bitrate pages that bridge embedded display work, streaming math, and file-size planning. Browse video and display tools.
Estimate H.265/HEVC file size from bitrate and duration, or calculate the target video bitrate for a desired file size.
Calculate live stream, RTSP, IP camera, and NVR pull bandwidth from main stream bitrate, sub stream bitrate, stream count, concurrent pulls, duration, and network overhead.
Estimate camera and CCTV storage from camera count, bitrate, audio, recording schedule, motion duty cycle, retention days, and capacity overhead.
Calculate display bandwidth for resolution, refresh rate, color depth, blanking, lanes, and link encoding overhead.
Start with the engineering value you need: validate a Modbus frame, size an I2C pull-up, estimate a Wi-Fi link or HEVC file, check display bandwidth, or derive STM32 timer registers.
Each tool page includes formula notes, related calculators, and authoritative references so you can verify the browser result against a data sheet, capture, firmware test, or bench measurement.