- 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 an angle, which can be set in degrees, radians, or grads.

- Triple exponential smoothing
Description and examples of triple exponential smoothing

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

- 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

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

- VARIANT DATE to datetime string
This online calculator converts VARIANT DATE (double) value to datetime string.

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

- Volume of body given the buoyant force
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 geometric shapes
Calculates volume of geometric shapes: cube, prism, pyramid, frustum, cone, cylinder, sphere, ellipsoid.

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

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

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

- Weighted moving average
Weighted moving average calculation by candles

- 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 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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