Tool index
Online engineering calculators
Practical browser-side tools with deterministic formulas, copyable outputs, related calculators, and how-to guides for long-tail engineering searches.
Modbus CRC Calculator
Calculate CRC-16/Modbus from ASCII or hex bytes and append the RTU low-byte/high-byte checksum to a request frame.
I2C Pull-Up Resistor Calculator
Find the safe I2C pull-up resistor window from NXP timing formulas and choose a standard E12 value.
H.265 Bitrate Calculator
Estimate H.265/HEVC file size from bitrate and duration, or calculate the target video bitrate for a desired file size.
Streaming Bandwidth Calculator
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.
Display Bandwidth Calculator
Calculate display bandwidth for resolution, refresh rate, color depth, blanking, lanes, and link encoding overhead.
STM32 Timer Calculator
Find STM32 timer prescaler and auto-reload values for a target frequency, including APB prescaler timer clock behavior.