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- 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

- Antilogarithm
Antilogarithm calculator

- 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.

- 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

- 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.

- 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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