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- About the Roman numerals
Description of Roman numerals. Converter of Roman numbers and decimal numbers

- Conversion between metric units of length and old Russian system of measures units of length
The calculators in this article convert units of length from old Russian system of measures units to metric units and back.

- Degrees-minutes-seconds to decimal degrees conversion and vice versa.
This online calculator converts the value of an angle given in the form of the degrees-minutes-seconds to degrees, expressed in decimal fraction and back from decimal fraction to degrees-minutes-seconds.

- Digital image size in pixels and photo print size
This article is about relation between image size in pixels and photographic print size. First, it recommends photographic print size for given digital image dimensions in pixels. Second, it finds resulting pixels per inch value for printed digital image with known linear and pixel dimensions.

- Energy measurement units
Energy unit converter (joules, kilowatt-hour, kilogram force per meter, horsepower per hour, kilocalories)

- Exotic length units
Converter from exotic length units to meters

- Flag semaphore signals
The calculator converts english phrase to the flag semaphore signal sequence.

- Morse Code
Morse Code translator

- Morse code. Mutator
Transforms text into Morse code and than changes dots and dashes into specified symbols

- Old Russian money
Converts old Russian monetary units into more common rubles and kopecks. Created by user's request.

- Plane angles measurement systems
- Pounds to Kilogramms convertion and vice versa
This online calculator can be used for convertion of kilogramms to pouns, ounces and grains as they are used in USA or UK.

- Power to the People
Power units converter.

- Relative humidity to absolute humidity and vise versa calculators
First calculator converts relative humidity to absolute humidity for given temperature and barometric pressure. Second calculator converts absolute humidity to relative humidity for given temperature and barometric pressure

- Shoe size comparison
- Telecommunications traffic, Erlang
The calculator gives telecom traffic in Erlang for given time span and total call duration.

- Temperature scales
Conversion between different temperature scales

- URL-encoded string decoder
This converter decodes URL-encoded string (percent-encoded characters). It converts reserved characters as well as UTF-8 characters