Water Loss & Dry Yield
Water Removed & Dry Yield Calculator
This tool turns two weights, the fresh weight and the freeze-dried weight of the same food, into four practical numbers: the weight removed, the weight reduction percentage, the dry yield percentage and the fresh-to-dry ratio. Enter both weights in the same unit, press Calculate, and read the results below.
What This Tool Does
Given a fresh weight and a freeze-dried weight for the same food, it reports what freeze drying removed and how much of the original weight is left.
Weight Removed
–
Fresh minus Freeze-Dried
Weight Reduction
–
Weight Removed ÷ Fresh × 100
Dry Yield
–
Dry ÷ Fresh × 100
Fresh-to-Dry Ratio
–
Fresh ÷ Dry, e.g. 5:1
What the Result Means
Weight Removed is simply the fresh weight minus the freeze-dried weight. For almost all foods it is mostly water, which is why it is also the starting estimate for rehydration, but it is a calculated number from your two weights, not a laboratory moisture content.
Weight Reduction expresses that removal as a percentage of the fresh weight: 80% fewer grams than where you started. Dry Yield is the other side of the same coin: the freeze-dried weight as a percentage of the fresh weight, so reduction and yield always add up to roughly 100% (80% + 20% in the example). The Fresh-to-Dry Ratio is the same relationship shown as parts: 5:1 means 5 parts fresh for every 1 part dry.
Use these numbers for portions, packaging, record keeping and planning. The better your weights, the more meaningful the results: weigh the food before loading and weigh the finished dry food before packaging.
The Formula
- Weight Removed = Fresh Weight − Freeze-Dried Weight
- Weight Reduction % = (Fresh − Dry) ÷ Fresh × 100
- Dry Yield % = Dry ÷ Fresh × 100
- Fresh-to-Dry Ratio = Fresh ÷ Dry, shown like 5:1
Important Limitations
- This is calculated weight removal, not an exact moisture content. Exact moisture content requires laboratory moisture testing; without it, do not call the removed weight "moisture content".
- Results are only as good as the two weights. A wet or partially dried sample, spilled product or a misread scale skews everything.
- Freeze-dried weight normally is lower than fresh weight, because water is removed. If your dry weight comes out higher, check your values first: that usually means a wrong reading or a mislabeled sample.
- Two foods with the same yield percentage can still dry, rehydrate and store very differently. Yield is one planning number, not a quality score.