Weigh a sample (A) of your harvested hops, making sure to 'tare' the scale before adding the hops, or subtract the weight of the container from the total weight.
Dry out the sample with a microwave, dehydrator, or oven. If using a microwave or oven, stir the sample every minute to prevent scorching! Weigh frequently: the sample is at 0% moisture when it no longer loses weight.
Harvest Moisture is % moisture (by weight)
Harvest Dry Matter is % dry matter (by weight)
Weigh a second sample (B) from your harvested hops, making sure to 'tare' the scale before adding the hops, or subtract the weight of the container from the total weight.
Select an empty sample bag that air can easily pass through (mesh or other permeable material) and weigh it. After you have recorded its weight, fill it with sample (B) and then place it in the oast with the rest of the harvest.
Decide on your target final moisture content. In general, hops should be dried to 8-12% moisture, with 8-8.5% being optimum.
Sample (B) will weigh grams when it reaches % moisture (by weight)
Including the weight of the bag, your Target Weight is grams
Download the Hop Harvest Moisture Calculator - Excel version (.xlsx).
See the UVM Extension Northwest Crops & Soils team video on Determining Hop Harvest Moisture & Ideal Storage Dry Matter, and read their blog on Hop Harvest Readiness. If you still have questions, send them to email@example.com.
Please report any problems or bugs with this tool to firstname.lastname@example.org.