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Draft Line Balance Calculator

Kegerator and draft setup tool

Draft line balance calculator

Estimate beer line length for a balanced draft system. Enter your serving pressure, faucet height, desired faucet pressure, and tubing restriction to get a practical starting length for each tap line.

Use the pressure you plan to serve at, not a temporary burst-carbonation pressure.
Measure from the center of the keg to the faucet. Use a negative number if the faucet is below the keg.
About 0.5-1.5 PSI at the faucet is a useful home-draft target.
Leave this at 0 unless you have a known faucet, shank, coupler, or fitting restriction value.
Restriction varies by manufacturer and line age. Use the tubing maker's spec when you have it.
This is the pressure drop created by each foot of beer line.

How draft line balance works

A balanced draft line uses tubing resistance to absorb most of the serving pressure before the beer reaches the faucet. The calculator subtracts the pressure needed at the faucet, the lift from keg to faucet, and any known fixed restriction. The remaining pressure is divided by the beer line's restriction rating.

The formula is: line length = (serving PSI - faucet PSI - vertical lift PSI - other restriction PSI) / line restriction PSI per ft. Vertical lift is estimated at 0.5 PSI per foot.

Why beer line length changes foam and pour speed

Too little beer line resistance can make a keg pour fast, foamy, or inconsistent because too much pressure reaches the faucet. Too much restriction can make the pour slow and frustrating. Line balance is the middle ground: enough restriction to control the pour while keeping the serving pressure matched to the beer's carbonation and temperature.

If a beer is already overcarbonated or too warm, longer line alone will not fix the problem. Start with the keg carbonation calculator to choose a serving pressure that matches the beer temperature and carbonation target, then use this calculator to estimate the line length for that pressure.

How to tune the result

  1. Start with the calculated line length for the tubing you are actually using.
  2. Keep the keg cold and let the beer settle at the serving pressure.
  3. Clean the faucet and beer line before blaming the balance calculation.
  4. If the pour is too fast or foamy, add line or lower serving pressure only if carbonation allows it.
  5. If the pour is too slow, shorten the line in small steps rather than cutting aggressively.

Different tubing brands, flow-control faucets, towers, and long warm shanks can change the real-world pour. Treat this calculator as a setup tool, then adjust based on your system.