About this site

About ConverterMaster

Free unit converters, everyday calculators, electrical and electronics tools, and file utilities. Fast, simple pages with no sign-up.

Tools run: in your browser • Last Updated: October 14, 2026

1. Who is behind this site

ConverterMaster is built and run by AS Electronic, a trusted electrical and electronics repair center.

I have studied both electrical and electronic fields, giving me a strong foundation in both theory and practice. I spent 10 years working as a senior technician at a private company, gaining invaluable hands-on experience across a wide range of equipment. Following that, I established my own shop, AS Electronic, which I have successfully run up to the present day, specializing in repairing and servicing diverse electrical and electronic devices.

Why ConverterMaster?

While servicing various equipment over the years, I constantly found myself needing different electrical calculators, unit converters, and various computer-based tools. Searching for each of these necessary tools required a huge amount of effort and time on the internet. Because of this, I wanted to create a single, reliable hub where all these utilities are brought together in one convenient place for myself and fellow engineers, technicians, and hobbyists. That is why this site was created as ConverterMaster.

ElectroLab and EL Tronic

I also run a YouTube channel called EL Tronic, where I post electronics repair tutorials and guides. Some of those videos are on this site in the ElectroLab section. The channel is here: EL Tronic on YouTube.

2. What this site is

ConverterMaster is a free collection of online tools: unit converters, everyday and health calculators, electrical and electronics calculators with repair and sizing guides, and a set of file utilities for images, PDFs and text. It is an independent project paid for by advertising, which is why some pages show ads.

The aim is simple: open a page, get an answer, and leave. No account, no sign-up and no paywall. I want these tools to be useful to people all over the world, so the site has a built-in language selector that can translate the pages into many languages.

3. How the tools work

Conversions and calculations run in your browser using standard formulas and published unit definitions. Where a unit has an exact definition, the exact value is used, for example:

  • Length: 1 international inch is exactly 0.0254 m.
  • Mass: 1 avoirdupois pound is exactly 0.45359237 kg.
  • Energy: 1 International Table calorie is exactly 4.1868 J; 1 thermochemical calorie is 4.184 J.
  • Power: 1 mechanical horsepower is about 745.69987 W.

Browsers use 64-bit floating-point numbers, so results are shown with sensible rounding to avoid artefacts such as 0.1 + 0.2 = 0.30000000000000004. For very large or very small values, a result may differ from a specialised scientific package in the last few digits.

4. Electrical calculators

The ElectroLab calculators (voltage drop, cable size, motor and transformer sizing, solar and battery sizing and similar) use common textbook formulas and, where relevant, widely published code tables such as NEC Table 310.16 or IEC cable tables. They are meant for quick estimates, learning and double-checking your own work.

Wiring rules and ratings differ by country and change between code editions. Always check the result against the code in force where you work, and have installation work done or approved by a qualified electrician or engineer.

5. Limits & corrections

The tools are provided as is, for general information only. Health calculators (BMI, BMR, body fat, pregnancy due date and so on) give general estimates and are not medical advice. Financial calculators are illustrations, not financial advice. See the disclaimer for details.

If you spot a wrong result, a missing unit or a typo, please tell us through the Contact page or email [email protected]. Corrections are checked and fixed as soon as we can.

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