About CovertItAll

Why this site exists

Hi, I'm Rick Oosterling. I built CovertItAll because I was tired of conversion sites that bury a simple answer under walls of generic text. When you need to convert a measurement, you're usually in the middle of doing something else: cooking a recipe, planning a 3D print, or checking if furniture fits.

You just want the number, and maybe a quick tip on how to use it correctly. That's exactly what this site does.

I run a 3D printer, drive an electric car, and regularly do calculations for real projects. That's how I knew which tools were missing. The site now covers electronics, EV charging, solar panels, 3D printing, and all the everyday unit conversions I kept searching for.

My background

I'm based in the Netherlands and work on practical hobby and maker projects in my spare time. Over the years that has meant designing and printing 3D parts with tight tolerances, wiring 12V systems for a camper van, sizing solar panels for off-grid use, and figuring out EV charging costs across different countries.

Each of those projects required fast, reliable unit conversions at some point. Wire gauge in American vs metric, filament in grams vs meters, solar output in Wh vs kWh, battery capacity in Ah vs mAh. I built the tools I needed and put them online.

The electronics section started because I kept needing Ohm's Law for LED circuits and voltage dividers. The 3D printing cluster grew out of calculating nozzle flow rates and comparing filament materials. The EV and solar sections came from my own charging and off-grid calculations. None of these were built to fill a content calendar. They were built because I needed them.

Who it's for

This site is for anyone doing practical work: hobbyists, students, makers, people following recipes, electricians checking wire gauge, engineers doing quick sanity checks, or anyone who needs a fast and accurate answer without the fluff.

I keep the pages lightweight so they load instantly, and only add explanations when they actually help you avoid common mistakes. A kg to lbs converter does not need a history lesson. But a voltage drop calculator should tell you what happens if the wire is too thin.

What's on this site

CovertItAll has over 200 converters and calculators across everyday categories: length, weight, temperature, speed, volume, data storage, pressure, and more. Each converter shows results the instant you type. No submit button, no page reload. Most converters can also be dropped into another site as a widget; see the embed tools page for the snippet and the full list.

Beyond standard unit conversions, the site has a dedicated 3D printing cluster: filament cost, volumetric flow, print time estimation, nozzle size comparison, and material guides for PLA, PETG, ABS and ASA. Electronics converters cover Ohm's Law, watts, amps, farads, and frequency. The EV and solar sections handle charging time, range cost, battery sizing, panel output, and off-grid planning. Specialty calculators handle fuel trip costs, pizza size comparison, salary-to-hourly, and more.

The blog covers practical topics: unit mistakes that break real projects, how to read electrical values, filament spool calculations, shoe size conversion gaps, and more. It is written from experience, not from keyword lists.

All content on this site follows a consistent approach to accuracy and AI assistance. The editorial standards page explains how pages are built, what sources are used, and how corrections are handled.

No fluff, just answers

There are no accounts to create, no apps to download, and no unnecessary clutter. Pick your tool, get your conversion, and get back to your project.

If you spot an error or have a tool request, use the contact page. I read every message.