- Conversion from decimal numeral system
This calculator converts given decimal value to other positional numeral system

- Conversion of decimal number to other notations
This calculator converts decimal number to binary, hexadecimal and octal notations

- Conversion of fractional numbers between numeral systems
This online calculator helps to convert fractional number in one numeral system to fractional number in other numeral system.

- Conversion of pounds into inches
Conversion of old pounds artillery caliber into more modern inches and millimeters

- Convert moles to grams and grams to moles.
This online calculator converts to moles given grams and converts to grams given moles

This calculator converts number from one numeral system to another, given both system's bases

- Converting degrees to radians
Converts radians to degrees, minutes and seconds

- Coulomb's law
This online calculator calculates unknown (whether force, charge or distance) using known values using Coulomb's law scalar formula. It can be used to solve physics problems.

- Count the number of words
The calculator counts word number in a given text. It can be used for rough calculation of translation cost. Can be used for word number calculation in software resources.

- Counting pipes from the end face
The approach to the calculation of the number of nested circles of smaller radius at a known length of the describing circle of a larger radius. Created by user request

- Course angle and the distance between the two points on loxodrome (rhumb line).
Calculation of a distance on loxodrome (rhumb line) and course angle (azimuth) between two points with a given geographical coordinates.

- Course angles and distance between the two point on the orthodrome(great circle)
Calculates the distance between two point of the Earth specified geodesic (geographical) coordinates along the shortest path - the great circle (orthodrome). Calculates the initial and final course angles and azimuth at intermediate points between the two given.

Adds and subtracts a specified time interval to the specified date

- Cramer's Rule
This online calculator solves system of linear equations using Cramer's rule and shows detailed steps of the solution

- Cryptarithmetic puzzle solver
This calculator is a solver of cryptarithmetic puzzles. Cryptarithmetic puzzle is a number puzzle in which a group of arithmetical operations has some or all of its digits replaced by letters or symbols, and where the original digits must be found. In such a puzzle, each letter represents a unique digit.

- Cuba World Development Indicators 2016 - in memory of Fidel Castro
This calculator provides access to 752 world development indicators for Cuba imported from World Bank data at 2016. In memory of Fidel Castro.

- Cube
- Cubic equation
Solution of cubic equation using Vieta's formulae. Created by user request

- Cylinder
- Cylindrical tank volume
Cylindrical tank volume

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