Unit conversions use standard SI conversion factors and 64-bit (IEEE 754) floating-point arithmetic in your browser. Results are rounded for display, so very large or very small values may differ from specialised scientific software in the last digits.

Can I use ConverterMaster completely offline without internet?

Mostly yes. The conversions run in your browser, so once the page has loaded once, most of the site keeps working without a connection. You can also add it to your phone's home screen. Pages you have never opened will still need internet.

Is ConverterMaster free?

Yes. Everything on the site is free and you don't need an account. The site is paid for by ads.

Are my conversion history and favorites stored privately?

Yes. Your recent conversions and favorites are saved only in your own browser, and the numbers you type are not sent to us.

What is the difference between gauge pressure (psig) and absolute pressure (psia)?

Gauge pressure (psig) measures pressure relative to local atmospheric pressure (typically 14.696 psia or 101.325 kPa at sea level), meaning an open pressure gauge reads 0 psig. Absolute pressure (psia) measures pressure relative to a perfect thermodynamic vacuum (0 psia). In thermodynamic gas law calculations (PV=nRT), you must always convert gauge pressure to absolute pressure by adding local ambient atmospheric pressure.

How does the Chronological Age Calculator account for leap years and varying month lengths?

Instead of dividing elapsed days by a rough 365 or approximating months as 30 days, it subtracts the dates the way you would on paper. When it has to borrow days, it uses the real length of the previous month (28 or 29 for February, 30 or 31 for the others). Leap years follow the usual rule: divisible by 4 and not by 100, or divisible by 400.

How do I convert land measurements between Perches, Square Feet, Roods, and Acres?

One linear perch (also called a rod or pole) is 16.5 feet. A square perch is therefore 16.5 × 16.5 = 272.25 sq ft (or approximately 25.2929 square meters). For larger real estate tracts: 40 Perches equal 1 Rood (10,890 sq ft), 4 Roods equal 1 Acre (160 Perches or 43,560 sq ft), and 1 Hectare equals approximately 395.37 Perches (10,000 m²).

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How it calculates

Conversions use standard 64-bit floating-point numbers, rounded for display.

Runs in your browser

Calculations happen on your own device. The numbers you type are not sent to our server.

Works offline

You can install it from your browser menu. After the first visit, the main tools keep working without a connection.

Who makes this site

ConverterMaster is run by AS Electronic, an electrical and electronics repair shop. The tools are free to use and the site is paid for by ads. If you find a wrong result or want a unit added, write to [email protected]. More on the About page.

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