# All online calculators

- Area expression with different units
Calculator expresses the given area through the different units of area measurement.

- Area of a convex quadrilateral. Example of creating a calculator.
This online calculator calculates area of a convex quadrilateral given diagonal values and value of angle between them. Article also describes the process of creating a calculator.

- Area of a quadrilateral
This article lists several calculators for area of a quadrilateral

- Area of a triangle
This is univeral online calculator for the area of a triangle which uses different methods to find the area of a triangle, depending on your knowledge of the triangle.

- Area of an irregular quadrangle with the given sides
Calculates an area of an irregular quadrangle with the given sides

- Area of triangle by coordinates
This calculator determines area of triangle, using its vertex coordinates in cartesian coordinate system

- Arithmetic progression
This online calculator computes last nth term of arithmetic progression and sum of the members

- Atbash cipher
This calculator allows you to encrypt and decrypt text with Atbash method

- Average wage сalculation (for Russia)
The calculator calculates the average wage, according to the decree of the Russian Federation government dated December 24, 2007 "On specifics of calculation of average wages" in edition of Russian Federation Government Resolution dated November 11, 2009.

- Azimuth and solar elevation angle
Calculation of azimuth and solar elevation angle by given the coordinates and time of observation. It's possible to input coordinates manually or by selecting from the directory of cities.

- Baffle Plate Gap Calculator
Use this to determine the baffle plate gap in a tank based on your throat size. Measure bell end depth using something the same width as your baffle plate or enter a zero if there is no belled end. The drawing is looking from the top down.

- Ball radius calculated by volume
- Bank card number validation
The calculator checks a bank card number using Luhn algorithm, it also determines the card issuer according to Issuers handbook.

- Barlow formula
Barlow´s Formula is used to calculate the pipe pressure considering its diameter, wall thickness, and hoop stress (in the pipe material).

- Barometric leveling
- Base 64 encoding and decoding
The calculators encode string to base64 string and decode back to original string. Special characters (+/) , generally produced by base64 algorithm, can be replaced by the data provided in additional parameter.

- Battery discharge time depending on load
This article contains online calculators which can calculate discharge times for specified discharge current using battery capacity, the capacity rating (i.e. 20 hour rating, 100 hour rating etc) and Peukert's exponent.

- Bayes’ theorem
This online calculator calculates posterior probabilities according to Bayes’ theorem.

- Beaufort scale
Conversion between wind speed measurement units including Beaufort numbers, km/h, m/s, mph, fps.

- Bernoulli trials table
This online calculator calculates probability of k success outcomes in n Bernoulli trials with given success event probability for each k from zero to n.