Engineering Calculators for Industrial Automation
This page brings together 15+ industrial automation calculators – all free, real‑time, and built for engineers. Whether you’re sizing a base resistor for an NPN transistor, scaling a 4‑20mA sensor signal, or calculating Modbus CRC‑16 checksums, you’ll find the tool you need. Each calculator is based on industry‑standard formulas (Ohm’s Law, voltage divider, pump power, etc.) and has been tested against real hardware. Use the tabs below to switch between Electronics, Industrial/Mech, and Networking tools.
👇 Click a category below to switch between tool sets.
Electronics Toolbox
Ohm’s Law, LED Resistor, Voltage Divider, NPN Base, E24 Finder, DC Power.
Ohm’s Law Calculator
Enter any two values to calculate the third (V = I × R).
LED Series Resistor Calculator
Calculate the required resistance and power rating for your LED circuit.
New to Ohm’s Law?
Read the Hardware Tutorial →Voltage Divider Calculator
Scale industrial signals (e.g. 24V) down to safe MCU levels (3.3V/5V).
Standard Resistor Finder
Find the nearest standard E24 (5%) resistor for your calculated value.
NPN Base Resistor Calculator
New to Ohm’s Law?
Read the Hardware Tutorial →DC Power Calculator
Calculate Power (Watts), Voltage, or Current for DC systems.