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- 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.

- 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

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

- Hyperbolic functions
Calculation of hyperbolic functions

- Imperial to Metric and Metric to Imperial measures of length converter
- 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

- Math equation simplification
Simplifies math equation with single variable (x). In eqation you may also use integer and fractional numerical constants arithmetic operations, trigonometric and hyperbolic functions.

- Math operations on degrees
This online calculator supports simple mathematical operations, addition/subtraction/multiplication/division, on degrees

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