- Tournament table
The calculator performs the participant placement with two following conditions: 1) Each participant must start from each starting position. 2) Each participant must encounter every other participant.

- Travel Duration
This online calculator computes travel duration given departure time and city and arrival time and city using time zones information

- Triangle angles for given triangle sides
This calculator computes triangle angles for given triangle sides using cosine law

- Trigonometric functions
This online calculator computes the values of elementary trigonometric functions, such as sin, cos, tg, ctg, sec, cosec for angle, which can be entered in degrees, radians, or grads.

- Usable volume of tank
This calculator find usable volume of tank, taking into account wall thickness

The relationship of the wave frequency, wavelength and propagation velocity.

- Use of Time Summary
This calculator summarizes time for different activities entered into table

- Values of one-variable function
This online calculator calculates values of one-variable function given function formula and set of variable values

- Vigenère cipher
Calculator encrypts entered text by using Vigenère cipher. Non-alphabetic symbols (digits, whitespaces, etc.) are not transformed.

- VOIP call bandwidth
The calculator works out bandwidth required to handle given number of VOIP calls with given audio codec.

- Volume of geometric shapes
Calculates volume of geometric shapes: cube, prism, pyramid, frustum, cone, cylinder, sphere, ellipsoid.

This calculator computes the volume of body given the buoyant force and density of the body, assuming that the buoyant force equals gravity force.

- Volume of the cylinder segment
Calculates volume of the cylinder segment

- Week number of a given date
Week number of a given date. Europe (ISO 8601) standard method, US method and simple numeration method.

- When it becomes profitable to pay the tax as a sole proprietor?
The calculator allows you to compare the taxes paid by an sole proprietor in the simplified taxation system and the individual.

- Wind Chill Index
This online calculator computes Wind Chill Index using Wind Chill Formula from Environment Canada

- Wind energy and wind power
This online calculator computes kinetic energy of wind and wind power

- Сomputer algebra
Derives a formula from input formulas and input data to calculate remained parameters

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