Free Online Tools for Electronics Engineers & Makers.

Fast, accurate, and industry-standard calculators for PCB design, circuit analysis, and IoT development.

Engineering Lab

30 Advanced Calculation Tools for Next-Gen Hardware Design

01 Fundamentals

Ohm’s Law

Instant Voltage, Current, and Resistance solver.

Voltage Divider

Step-down resistor network calculations.

LED Resistor

Protect LEDs with precise series resistors.

Parallel Resistance

Equivalent resistance for complex networks.

Zener Regulator

Shunt regulation and voltage clamping.

Inductor Color

Decode axial inductor values and tolerance.

Energy Storage

Joules stored in capacitors and inductors.

02 PCB & Signal Integrity

Trace Width

Current capacity vs temperature (IPC-2221).

Microstrip Z0

Surface layer characteristic impedance.

Stripline Z0

Impedance for internal multilayer traces.

Differential Pair

High-speed USB/HDMI/PCIe coupling.

Skin Depth

HF current penetration in conductors.

RF Unit Conv

dBm to Watts, Vpp and Vrms converter.

03 Antenna Design

1/4 Wave Monopole

Exact length for whip and IoT antennas.

1/2 Wave Dipole

Classical wire antenna dimensions.

Inverted-V

Sloping dipole antenna wire length.

PCB Patch

Integrated microstrip antenna solver.

04 Power Electronics

Buck Inductor

Minimum inductance for DC-DC switchers.

Battery Life

Duty-cycle based runtime estimation.

Thermal Solver

Heatsink and Tj requirements.

Toroid Winding

Ferrite core turns and inductance.

Voltage Drop

Power loss in long DC cable runs.

LM78XX/79XX

Linear regulator capacitor sizing.

Analog Power→

Transformer

Turns ratio, voltage and current.

05 Analog & Signals

RC Filter

Passive filter cutoff frequency.

555 Timer

Astable PWM and Frequency calculator.

Op-Amp Gain

Resistor values for gain control.

RLC Impedance

AC vector analysis and phase shift.

LC Resonance

Tank circuit tuning frequency.

Clock Divider

Logic-based frequency division.

Coder’s Handbook | Master Edition

Coder’s Handbook

Complete Reference for Hardware, Embedded & Web.

Core Development

Embedded Logic

Pointers, memory management, and low-level system design.

uint8_t *ptr = &buffer[0];

Hardware I/O

Rapid prototyping for AVR and ARM microcontrollers.

attachInterrupt(digitalPinToInterrupt(2), iso, RISING);

Data & Scripting

From MicroPython machine API to server-side automation.

[x for x in data if x > 10]

Web Interfaces

Responsive dashboards and real-time WebSocket monitoring.

ws.onmessage = (e) => update(e.data);

Linux Systems

Terminal Core

Commands for system monitoring and networking.

grep -r “error” /var/log/syslog

Hardware Hubs

IoT connectivity

Wi-Fi, Bluetooth, and Deep Sleep power management.

esp_wifi_set_mode(WIFI_MODE_STA);

INTERFACES

37 Interface high and low

INTERFACES LOW AND HIGH SPEED

Universal Asynchronous Receiver-Transmitter. Basic point-to-point serial communication.

Baud: 115.2 kbps

Inter-Integrated Circuit. 2-wire bus for connecting multiple sensors and peripherals.

Serial Peripheral Interface. High-speed synchronous data link for fast IC communication.

Mode: Full-Duplex

Unique bus providing power and data over a single wire. Used for IDs and temperature.

Feature: Parasitic Power

High Speed

PCIe 5.0

Standard for connecting high-speed components like GPUs and NVMe SSDs to CPU.

BW: 32 GT/s per lane

High Speed

USB4

Unified connectivity standard for data, video, and high-wattage power delivery.

Speed: 80 Gbps

High Speed

400G Eth

Massive throughput networking for backbone infrastructures and data centers.

Media: Fiber Optic

High Speed

HDMI 2.1

Audio/Video interface supporting 8K resolution, VRR, and Dynamic HDR metadata.

BW: 48 Gbps

High Speed

DP 2.1

DisplayPort. Optimized for high refresh rates and daisy-chaining monitors.

Peak: 80 Gbps

High Speed

DDR5

Next-gen RAM interface with on-die ECC and improved power management.

Freq: 6400+ MT/s

High Speed

SATA III

Legacy but stable interface for bulk storage HDD and SATA SSD drives.

Speed: 6 Gbps

High Speed

InfiniBand

Low-latency, high-bandwidth interconnect for AI and supercomputer clusters.

Usage: HPC Clusters

Industrial

CAN FD

Controller Area Network with Flexible Data-rate for automotive and robotics.

Robust: High

Industrial

RS-485

Long-distance differential signaling for noisy industrial environments.

Dist: 1200m

Industrial

EtherCAT

Industrial Ethernet that processes data on-the-fly for real-time control.

Latency: <100µs

Industrial

PROFIBUS

Fieldbus for process and factory automation. Trusted legacy standard.

Phys: RS-485

Industrial

PROFINET

Ethernet-based automation standard compatible with standard IT networks.

Type: Real-Time Eth

Industrial

HART

Bi-directional communication over 4-20mA analog instrumentation loops.

Signal: FSK

Industrial

Modbus TCP

Open, simple protocol for connecting PLC and SCADA over Ethernet.

Port: 502

Industrial

IO-Link

Short-distance digital interface for connecting smart industrial sensors.

Pins: 3-wire

Audio

I2S

Standard for transmitting digital audio between chips on a PCB.

Data: PCM

Audio

S/PDIF

Digital audio interface for consumer electronics (Coax or Toslink).

Mode: Optical

Audio

MIDI

Communication protocol for musical instruments and controllers.

Baud: 31.25 kbps

Audio

AC’97/HDA

Architecture for PC audio integrated on the motherboard.

Codec: Intel Std

Wireless

Wi-Fi 7

Extreme High Throughput (EHT) wireless LAN for 8K and VR.

Freq: 6 GHz

Wireless

Bluetooth 5.3

Short-range mesh and low-energy audio communication.

Feature: LE Audio

Wireless

LoRaWAN

Low-power wide-area network for IoT devices over long distances.

Range: 15 km

Wireless

Zigbee

Energy-efficient mesh networking for smart home ecosystems.

Topology: Mesh

Special

SpaceWire

High-speed satellite links with focus on fault tolerance and EMC.

Agency: NASA/ESA

Special

MIL-1553

Redundant command/response bus for military avionics and tanks.

Safety: Critical

Special

ARINC 429

Unidirectional data bus standard for commercial aircraft avionics.

Logic: Bipolar

Special

JTAG

Standard for testing PCB assemblies and debugging microprocessors.

Interface: 4-wire

Mobile

MIPI CSI/DSI

Mobile Industry Processor Interface for cameras and displays.

Pins: Differential

Special

LVDS

Low-voltage differential signaling for high-speed LCD data.

Voltage: 350mV

Storage

SAS-4

Enterprise-grade storage interface for high-availability servers.

Rate: 22.5 Gbps

Vision

Camera Link

High-speed interface for real-time machine vision cameras.

Class: Industrial

Special

SWIM

Single Wire Interface Module for debugging STM8 controllers.

Pins: 1-wire

ABOUT

Welcome to ENGICALC.IO My name is Roman, and I am a professional Electronics Engineer.

I created this platform to provide my fellow engineers, students, and hobbyists with a suite of fast, reliable, and easy-to-use calculation tools. Every calculator on this site is based on industry standards, such as IPC-2221 for PCB design and fundamental laws of physics.

My Mission: To simplify the hardware design process and reduce the time spent on routine manual calculations. Whether you are designing a complex IoT device on an ESP32 or just learning your first Ohm’s Law circuits, these tools are here to ABOUThelp.

Feel free to contact me if you have suggestions for new tools!

CONTACT

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Torrance, CA 90101
United States

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