- Acceleration of gravity
Acceleration of gravity calculation on the surface of a planet. It's possible to calculate the acceleration above the surface by setting the sea level. But it won't be possible under thesurface - this is a wrong formula.

- Age
Calculate your age with minute precision

- Altitude of a triangle
This online calculator computes the length of a altitude of a triangle, given the lengths of edges of a triangle.

- Altitude Pressure
This calculator uses barometric formula to find out the pressure at the given altitude

- Angle bisector of a triangle
This online calculator computes length of angle bisector given the lengths of triangle edges

- Angular size, linear size and distance
These calculators computes value of angular size or linear size or distance from the other two's

- Angular velocity and linear velocity
This online calculator converts angular velocity to linear velocity for given radius

- Apparent temperature
This online calculator computes apparent temperature, taking into consideration wind speed and relative air humidity. It uses Australian Bureau of Meteorology formula

- Area de la Sombra de un Objeto
El área de la sombra se refiere a la de un objeto cuadrado o rectangular.

- 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.

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.

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

- 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

- 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.

- 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.

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