How Much Green Coffee Do You Need for a 12 oz Bag?
A 12 oz bag contains 12 oz of finished roasted coffee. Because roasting reduces weight, you need more than 12 oz of green coffee to produce it.
Updated
Divide finished weight by yield
Green coffee needed = finished coffee weight / roast yield. At an illustrative 85% yield, 12 / 0.85 = approximately 14.12 oz of green coffee, or 0.882 pounds. Enter yield as a decimal in this calculation.
See how yield changes the answer
At 80% yield, a 12 oz bag needs 15 oz of green coffee. At 85%, it needs about 14.12 oz. At 90%, it needs about 13.33 oz. These examples demonstrate the arithmetic; they are not recommended roast targets.
Scale up to a packing run
For 100 bags of 12 oz each, you need 1,200 oz, or 75 pounds, of finished coffee. At 85% yield, that requires approximately 88.24 pounds of green coffee before any separate allowance for sampling, packing loss, or overfill.
Use the same yield in your cost calculation
At an illustrative landed green price of $5 per pound, 0.882 pounds contributes about $4.41 in coffee cost per bag. Add packaging and labor separately. Recording actual roast weights in RoastBase helps keep the yield behind these calculations grounded in your own production.