# All online calculators

- 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.

- Complementary color
This calculator shows complementary colors for entered colors

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

- Complex numbers
The calculator displays complex number and its conjugate on the complex plane, evaluate complex number absolute value and principal value of the argument . It also demonstrates elementary operations on complex numbers.

- Complex polynomial value calculation
The calculator evaluates polynomial value. The polynomial coefficients can be either real or complex.

- Compound interest
This calculator computes compound interest

- Compound interest at certain number of days
- Compound interest with an equal monthly investment
The calculation of the accumulated amount with the monthly investiment

- 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

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

- Conversion between imperial and metric units of area
These calculators convert imperial to metric and metric to imperial units of square

- Conversion between metric units of length and old Russian system of measures units of length
The calculators in this article convert units of length from old Russian system of measures units to metric units and back.

- 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 days to years, months and days
This online calculator convert number of days to number of years, months and days in the month.