Online Engineering Tools

Free browser-based calculators and utilities for electronics engineers, CNC operators, and automation specialists.

Live

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Curve Fitting & Regression Calculator

Fit polynomial (degree 1–10), exponential, logarithmic, or power-law curves to measured data. Generates Chart.js plot, R² statistics, and ready-to-use C/Arduino/MicroPython code with Horner’s form optimisation. Includes LUT generator for MCUs without FPU. Open Tool →

Coming Soon

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PID Tuner Simulator

Interactive Kp/Ki/Kd sliders with live step-response simulation. Enter plant transfer function parameters and visualise closed-loop response. Tune before connecting hardware. Coming Soon

Coming Soon

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GRBL Settings Calculator

Enter motor steps/rev, microstepping ratio, and lead screw pitch → output $100–$102 (steps/mm) values for GRBL. Also computes max feed rate and acceleration limits. Coming Soon

Coming Soon

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Encoder PPR Calculator

CPR × 4 = PPR (quadrature), maximum RPM for a given timer frequency, linear resolution from PPR + ball screw pitch. Essential for sizing encoder and servo systems. Coming Soon

Coming Soon

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PCB Trace Width Calculator

IPC-2221 compliant: enter current, temperature rise allowance, and copper weight → minimum trace width for internal and external layers. Coming Soon

Coming Soon

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Modbus RTU CRC Calculator

Input a hex Modbus frame → compute and verify CRC16. Paste raw bytes from a logic analyser or serial capture to debug Modbus communication issues instantly. Coming Soon

Coming Soon

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PWM Frequency Calculator

MCU system clock, prescaler, and TOP value → PWM frequency and duty cycle resolution. Covers RP2350, ATmega, STM32, ESP32 prescaler/counter configurations. Coming Soon

Coming Soon

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RS-485 Termination Advisor

Cable length, baud rate, and cable impedance → recommended termination resistor value. Explains when termination is necessary and how to wire it correctly. Coming Soon

Request a tool. If there is a calculation you do regularly and wish it was online, let us know. We add tools based on customer demand.