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

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

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

- 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.

- 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

- 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.

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

- Cylinder

Cylindrical tank volume

- Density of oil
Recalculation of density of oil for different temperature and pressure values. Formulas are taken from Russia's GOST R 8.610-2004. "State system for ensuring the uniformity of measurements. Density of oil. The tables for recalculation" standard

- Derivative
It finds one variable function derivative. Step by step differentiation solution is also provided.

- Determinant of 3x3 matrices
This calculator calculates the determinant of 3x3 matrices

- Determinant of a matrix
This online calculator computes determinant of a matrix, using it's definition

- Determining air humidity with psychrometric method
- Dew point
This calculator determines dew point from given temperature and relative humidity of air

- Direct observation error analisys
Calculates error of direct measurements for given measured value series and confidence interval.

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