Coffee Data Science

Coffee Density Metric Compared to a Cheaper Method

More equipment evaluations

Robert McKeon Aloe
2 min readMar 1, 2024

Coffee density is a useful metric to look at roast level outside of roast color and weight loss from roasting. I have been using a 80 ml tube to measure density for the past two years, and I wanted to compare that method to the Syncfo. So I collected some data across a few roasts on the Roest.

80 ml tube vs Syncfo

Firstly, the Syncfo assumes beans filling the chamber. I took some measurements increasing the weight in the chamber and measuring the density. This shows an assumed volume to calculate density.

Comparing density over 56 roasts, the 80 ml test tube was off from the Syncfo, but there looks to be a clear relationship with a good R².

None of these tests were meant to pass judgement. I was to fully understand how to use the equipment and the potential errors that could be introduced.

One solid conclusion is that the density measurement is assuming the volume is filled with beans or grounds. This means that as long as you collect density data using a constant volume, you could make this measurement for much cheaper for home roasters.

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Robert McKeon Aloe

I’m in love with my Wife, my Kids, Espresso, Data Science, tomatoes, cooking, engineering, talking, family, Paris, and Italy, not necessarily in that order.