Strain measurements on machine components or structural elements with rosettes are necessary in real life problems to understand actual stress states on them.
Strain measurement is conveniently and accurately done with strain gages. Strain gages are consisted of thin electrical wire and are glued parallel to the direction
where measurements are desired. As the material elongates (or shorten), the electrical resistance of strain gage changes. By measuring the current passing
through the gage, strain can be determined accurately for the loading condition.

By measuring 3 normal strain for a point on a surface of machine component (ε_{1}, ε_{2}, ε_{3}), two normal and one shear strain can be calculated
for the point on xy plane (ε_{x}, ε_{y}, and γ_{xy}).
The arrangement of three strain gages is shown in the figure and this configuration is called
strain rosette.

This calculator was developed to use measurement results of strain rosette (ε_{1}, ε_{2}, ε_{3}) to calculate strain results of ε_{x}, ε_{y}, and γ_{xy}.
Calculation of rosette types with different angle setups (e.g. 45° and 60°) can be done by simply changing angles in calculator.
The formulas used for the calculations are given in the List of Equations
section.