- 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.

- Dimensiones de pantalla y proporción de aspecto
Esta calculadora en línea encuentra dimensiones de pantalla - altura y ancho, dado el valor diagonal y proporción de aspecto.

- Direct observation error analisys
Calculates error of direct measurements for given measured value series and confidence interval.

- Distance calculator
- Email extractor
This online calculator parses emails from block of text using regular expression

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

This online calculator generates Huffman encoding for given frequency of occurrence of symbols.

"One of the following characters is used to separate data fields: tab, semicolon (;) or comma(,)":

- Geometric progression
This calculator computes n-th term and sum of geometric progression

- GET request string parser
This parser break GET request string to the parameter-value pairs and decodes URL-encoded sequences, if needed

- Hill cipher
This calculator uses Hill cipher to encrypt/decrypt a block of text

- Hip roof calculator
This calculator will help you estimate hip roof parameters, including rafters and roof area

- Hyperbolic functions
Calculation of hyperbolic functions

- Inverse Hyperbolic Functions
Calculation of inverse hyperbolic functions of given argument

- Laminate flooring. The calculation of the number of planks
The calculation of the number of planks requiered

- Level of liquid in the cylindrical tank, AKA Quarter-Tank Problem
This online calculator finds the height above the bottom of a horizontal cylinder (such as a cylindrical gas tank) to which the it must be filled for it to be full at specified percentage (for example, one quarter full amounts)

- Liquid level in the tilted cylinder
Сalculates the level of the liquid in a tilted cylindrical tank with the tank parameters and the liquid volume.

- LL1 grammar analysis. Yet another top-down parser generator.
The calculator checks LL1 grammar correctness, parses a text using the grammar, shows FIRST, FOLLOW and FIRST PLUS sets, parsing tree and gives PLANETCALC parsing code.

- Loan payment example
- Logarithm
This online calculator outputs logarithm of a number to a given base, as well as natural logarithm and common (decadic) logarithm

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