# All online calculators

- RGB - HSV and HSV - RGB converter
This calculator converts RGB color to HSV color and vise versa

- Roman numerals
Converter of Roman numbers and decimal numbers

- Root and power
This calculator outputs desired root and power of entered number

- Russian Central Bank Currency Rates
Russian Central Bank Currency Rates

- Russian non-working days
The calculator displays official day offs for the current year and the weekends adjacent to them. The calculator takes into account weekends shifts according to Russian Federation Government Decrees.

- Russian text typed in English letters
Restores the Russian phrase, accidentally typed on the English keyboard layout.

- Saturation vapour pressure
This online calculator computes saturation vapour pressure for given temperature and atmospheric (barometric) pressure

- Seasonal fluctuations. Seasonal indices. Constant mean method.
The study of periodic (seasonal) fluctuations. Calculation of average seasonal index by constant mean method.

- Seating chart
This calculator tries to find seating chart combinations taking into account preferences of students.

- Secant method
The secant method is a root-finding algorithm that uses a succession of roots of secant lines to better approximate a root of a function f.

- Second, third and other derivatives
Evaluates first, second third and other derivatives of a single argument function

- Select a phone number from the text
This calculator uses regular expressions to select phone numbers from a large block of text

- Shadow length
Gives a vertical object shadow length for given coordinates and time. Also calculates shadow growth during whole day.

- Shannon Entropy
This online calculator computes Shannon entropy for a given event probability table and for a given message

- Shipment weight
Calculating the weight by the volume of shipment. Created by user's request.

- Shoe size comparison
This calculator converts european shoe size to its english and US counterparts.

- Side length of a right triangle
Calculates the side length of a right triangle from two other sides using Pythagorean theorem. Created by user's request

- Side length of a triangle
This calculator computes side length of a triangle given two sides and angle between them (law of cosines)

- Side length of the regular polygon
Calculates the side length of the regular polygon circumscribed or inscribed to a circle. Created by user's request

- Side of regular polygon from polygon area
Calculates the side length of regular polygon given the area of the regular polygon and number of sides