- Circumcircle of a triangle
This online calculator determines the radius and area of the circumcircle of a triangle given the three sides

- Clapeyron-Mendeleev equation. The relationship between the number of moles of gas, the temperature, volume and pressure.
Clapeyron-Mendeleev equation. The relationship between the number of moles of gas, the temperature, volume and pressure.

- Combinatorics. Combinations, arrangements and permutations
This calculator calculates number of combinations, arrangements and permutations for given n and m

- Combinatorics. Generator of combinations.
Combinatorics. Generator of combinations of m from n.

- Compass Points
The calculator gives name of compass point by direction angle in degrees.

- Compass, magnetic and true course.
Calculates true, magnetic and compass direction(course, bearing) by given direction, magnetic declination and deviation.

These calculators convert imperial to metric and metric to imperial units of square

- Complex fraction
This online calculator evaluates arithmetic expressions with common or complex fractions.

- Compound interest
This calculator computes compound interest

- Compound interest. Arbitrary payment
Compound interest calculator with the possibilityto set all the parameters of the compound interest formula

- Cone
- Cone development
Calculator of right circular cone / truncated right circular cone development

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

- 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

- 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.

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