Bottle-conditioning is how most homebrewers carbonate their beer without a kegging setup: a small, precisely weighed dose of sugar goes into the bottling bucket, the residual yeast eats it, and the CO2 that's produced has nowhere to go but into solution. Get the dose right and you have a well-carbonated beer in two to three weeks. Get it wrong — too little and the beer is flat, too much and you risk gushers or bottle bombs — and the batch is ruined or dangerous.
How the Priming Sugar Calculator works
Temperature estimates retained CO2 only in light of beer history. For unpressurized beer, use the appropriate warm fermentation history; cold crashing alone does not prove reabsorption. Pressure-fermented, previously carbonated or force-carbonated beer requires a measured/process-supported retained-CO2 estimate. Adding sugar cannot reduce existing carbonation. At fixed target and retained CO2, too large an entered packaged volume raises the dose for the actual beer; too small an entered volume lowers it. Container pressure limits and complete fermentation still matter.
Inputs and what they mean
Temperature estimates retained CO2 only in light of beer history. For unpressurized beer, use the appropriate warm fermentation history; cold crashing alone does not prove reabsorption. Pressure-fermented, previously carbonated or force-carbonated beer requires a measured/process-supported retained-CO2 estimate. Adding sugar cannot reduce existing carbonation. At fixed target and retained CO2, too large an entered packaged volume raises the dose for the actual beer; too small an entered volume lowers it. Container pressure limits and complete fermentation still matter.
Limits and edge cases
Temperature estimates retained CO2 only in light of beer history. For unpressurized beer, use the appropriate warm fermentation history; cold crashing alone does not prove reabsorption. Pressure-fermented, previously carbonated or force-carbonated beer requires a measured/process-supported retained-CO2 estimate. Adding sugar cannot reduce existing carbonation. At fixed target and retained CO2, too large an entered packaged volume raises the dose for the actual beer; too small an entered volume lowers it. Container pressure limits and complete fermentation still matter.