Metric Units IBU_PER_GRAM = (%UTILIZATION * %ALPHA * 1000) / VOLUME(litres) IBU = GRAMS * IBU_PER_GRAM To predict the number of ounces needed to hit a target IBU: GRAMS = IBU / IBU_PER_GRAM Non-metric Units IBU_PER_OZ = (%UTILIZATION * %ALPHA * 7462) / VOLUME(gallons) IBU = OUNCES * IBU_PER_OZ To predict the number of ounces needed to hit a target IBU: OUNCES = IBU / IBU_PER_OZ Jackie Rager's numbers have been used successfully by hundreds of homebrewers and provide a consistent base with which to work.
(ounces; needed; to hit a target IBU) (IBU / IBU_PER_OZ Jackie Rager's numbers; have been used successfully; by hundreds of homebrewers) (ounces; needed; to hit a target IBU)
ounces IBU / IBU_PER_OZ Jackie Rager's numbers ounces
needed have been used successfully needed
to hit a target IBU
by hundreds of homebrewers
to hit a target IBU