- 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
- Cylinder

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

- Cylindrical tank volume
Cylindrical tank volume

- Derivative calculator
Online calculator which determines first derivative of a function

- 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

Calculator expresses a given length through the different units.

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

- Doppler Effect in sound
Calculation of frequency and wavelength change for a moving source

- Ellipsoid
Calculates ellipsoid and spheroid volume and surface area.

- Energy measurement units
Energy unit converter (joules, kilowatt-hour, kilogram force per meter, horsepower per hour, kilocalories)

- Evaluating expressions
This online calculator substitutes a specific value for each variable, and performs the operations, evaluating the given expression.

- Extended Euclidean algorithm
This calculator implements Extended Euclidean algorithm, which computes, besides the greatest common divisor of integers a and b, the coefficients of Bézout's identity

- Factorial
Online calculator computes factorial of given positive integer (up to 170!)

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