- Solution of a system of 3 linear equations
Solution of a system of 3 linear equations with 3 variables

- Solution of nonhomogeneous system of linear equations using matrix inverse
Solution of nonhomogeneous system of linear equations using matrix inverse

- Solution of quadratic equation
Solution of quadratic equation, including complex roots

- Sound Speed in Gases
This online calculator computes speed of sound in an ideal gas.

This online calculator find a solution to the question how to fill tank with certain amount of water using two buckets of different size

- Space object velocity
It calculates the circular orbital velocity, escape velocity and planetary system escape velocity for the given planet parameters.

- Sphere
- Spherical cap and spherical segment
This calculator computes volume and surface area of spherical cap and spherical segment

- Student t-distribution
Calculates cumulative distribution function value and probability density function value for Student t-distribution. Quantile calculator evaluates Student quantiles for given probability and specified number of degrees of freedom.

- Sun position at a given date. Azimuth and elevation table.
Calculation of azimuth and elevation of the sun above the horizon for a given position and time. Table with one hour increments.

- Sunrise and sunset calculator
Sunrise/Sunset calculation for given latitude and longitude or for given city. Source: Almanac for Computers, 1990 published by Nautical Almanac Office United States Naval Observatory Washington, DC 20392

Solving 0/0 and ∞/∞ limit problems using L'Hospital's Rule.

- Sunrise and sunset time
This online calculator is intended for sunrise and sunset time calculation for given place and date. The calculator algorithm is obtained from the great book of Oliver Montenbruck and Thomas Pfleger "Astronomy on the Personal Computer".

- Surface area of a cube
- Surface tension. Weight and volume of the drop of liquid
This online calculator calculates the weight and the volume of the drop given the surface tension, diameter of the capillary tube, and density of the liquid

- Symbol frequencies table
This online calculator builds symbol frequency table for a given message

- Tank volume
Calculator computes tank volume given its length, diameter and walls depth. Created by user's request.

- Telecommunications traffic, Erlang
The calculator gives telecom traffic in Erlang for given time span and total call duration.

- Temperature scales
Conversion between different temperature scales

- The basal metabolic rate
This calculator computes BMR calories

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