- Boiling point dependence on the altitude above sea level
This online calculator finds the water boiling temperature given the atmospheric pressure in millimeters of mercury.

- Circular segment
Can calculate area, arc length,chord length, height and perimeter of circular segment by radius and angle.

- Cone development
Calculator of right circular cone / truncated right circular cone development

This calculator computes height expressed in old Russian measure system units: arshins and vershoks

- Level of liquid in the cylindrical tank, AKA Quarter-Tank Problem
This online calculator finds the height above the bottom of a horizontal cylinder (such as a cylindrical gas tank) to which the it must be filled for it to be full at specified percentage (for example, one quarter full amounts)

- Projection
Calculation of unknown parameters of projection using known parameters. Parameters are duration, maximum height, distance, initial velocity and angle.

- The waves and the wind. Wave height statistical forecasting
Predicting the height of the waves depending on the wind strength