- Cylindrical tank volume
Cylindrical tank volume

- Density of oil
Recalculation of density of oil for different temperature and pressure values. Formulas are taken from Russia's GOST R 8.610-2004. "State system for ensuring the uniformity of measurements. Density of oil. The tables for recalculation" standard

- Derivative
It finds one variable function derivative. Step by step differentiation solution is also provided.

- Determining air humidity with psychrometric method
- 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.

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
- Double exponential smoothing
Description and example of the double exponential smoothing

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

- Exponential smoothing
Exponential smoothing theory

Exponential Moving Average calculation by candles

- 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

- Histogram
Histogram generation according to input data. The number of groups is determined by the Sturgess formula, other formulas or set manually

- Histogram group number
Sturges formula and other methods of determining the number of groups in histogram generation

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

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