> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/boomerang-3-calibration-app-manual/advanced/calculation-method.md).

# Calculation method

This chapter describes the calculation method used by the Cal App.

The Cal App calculates the values for the certificate using 10 pairs of readings of calibrated and reference sensors collected at 1 minute interval. The readings of both sensors are asynchronous and the Cal App matches the readings to assure the lowest possible time difference between their timestamps.

An Excel sheet T-230-18 Uncertainty calculation template 107.xlsx can be used to verify the calculations.


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