Binary / Decimal IPv4 Subnet Calculator A fast, client-side IPv4 subnet calculator for network engineers and students. Enter an IP in binary (32 bits) or dotted-decimal (e.g., 192.168.0.1) and a mask as CIDR prefix (0–32), binary mask, or dotted mask (e.g., 255.255.255.0). The tool converts binary to dotted IP, validates contiguous masks, and returns subnet…
When sitting too close to a monitor, individual pixels may become visible, reducing the sharpness of the image. This calculator helps you find the minimum distance at which your display will appear perfectly smooth to the human eye. By entering your screen size and resolution, you can estimate the so-called “retina” viewing distance — the…
Your password is the first line of defense against hackers — but how strong is it really? With our Password Security Calculator, you can quickly check the strength of any password and see how long it would take to crack using different types of computers, from a standard office PC to a gaming rig, a…
Body Mass Index (BMI) Calculator Welcome to our free Body Mass Index (BMI) Calculator — a quick and easy way to estimate whether your weight is within a healthy range for your height. BMI is a useful indicator of body fat levels and can help identify potential health risks associated with being underweight, overweight, or…
Our free online color code converter is a simple tool that lets you convert a color from one format to another.. In web development and digital design, the three most common formats are HEX, RGB, and HSL. While all three represent the same color, they are written differently and are used in different contexts. For…
An ugly balun (air-core coaxial choke) is a simple and effective way to suppress common-mode currents on the feedline of your HF antenna. It consists of several turns of coax wound tightly on a non-conductive form such as a PVC pipe or even a soda can. This calculator helps you quickly design your own ugly…
Introduction to the Binary–Decimal–Hex Converter Working with different number systems is an essential skill in computer science, electronics, and programming. While humans typically use the decimal system (base 10) in everyday life, computers rely on binary (base 2), and many engineers prefer hexadecimal (base 16) for a more compact representation of data. Switching between these…
Antenna design made simple Planning and cutting antenna wires often raises the same questions: how long should the dipole arms be?, what if I use insulated wire?, or how much do I need to trim if the resonance is off? This calculator helps you estimate the correct lengths for common amateur-radio antennas (dipoles, verticals, EFHW,…
This calculator helps you estimate coaxial cable loss at your chosen frequency and length. By entering frequency, cable type, and length (in meters or feet), you can see how many decibels are lost and what percentage of transmitter power actually reaches the antenna. If you also provide transmitter power in watts, the tool will calculate…
Ever wondered how far away a server really is when you see a ping time? This tool converts network latency (in milliseconds) into an estimated straight-line distance based on the speed of signal propagation. By considering the transmission medium (fiber, copper, or air), path detours, and jitter, it offers a realistic approximation of how far…
