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Find the balanced beer line length that pours without foaming. Covers 5 tubing IDs with a PSI breakdown and a pour-speed check for lines too fast or slow.

📘 How to Use

  1. Enter the serving pressure (CO2) on your keg in PSI
  2. Pick the beer line material and inner diameter
  3. Enter the faucet height above the keg and read the recommended line length and PSI breakdown

Beer Line Length Calculator

Recommended beer line length
2.5 m
8.2 ft
Pressure balance breakdown
Applied pressure 12.0 PSI
Gravity correction -0.5 PSI
Residual pour pressure -1.0 PSI
Pressure for the line to drop 10.5 PSI
Line resistance 3.0 PSI/ft
Pour-speed estimate
~10 sec/pint

Within the ideal pour-speed range.

Formula: length = (applied PSI - 1 PSI residual - 0.5 x height in ft) / resistance per foot.

Pour speed is a rough estimate (based on ~10 sec/pint at balance). Judge by the actual foam in the glass.

Results are an estimate. Fine-tune length and pressure against your actual pour.

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Beer Line Length Calculator | Balance a Draft System That Pours Without Foam

Work out the balanced beer line length from your keg pressure, tubing resistance and faucet height. Covers five vinyl and polyethylene inner diameters with a full PSI breakdown and a pour-speed estimate.

💡 About this tool

Most "all foam" or "trickle" problems on a home kegerator come down to one thing: the beer line length and the serving pressure are not balanced. A 3/16 in ID vinyl line adds about 3 PSI of resistance per foot, and the line's whole job is to bleed off that serving pressure so the beer reaches the faucet at a low, non-foaming pressure.

This calculator uses the line-balancing math homebrewers rely on: length = (applied PSI − 1 PSI residual − 0.5 × height in ft) / resistance per foot. Push the pressure up and you need a longer line; raise the faucet above the keg and gravity adds back-pressure, shaving a little off the length you need. Knowing the number before you cut means you stop hacking lengths off a line by trial and error.

🧐 Frequently Asked Questions

Why does a line that is too short pour all foam? A short line cannot bleed off enough of the serving pressure, so the beer arrives at the faucet moving too fast. The turbulence knocks dissolved CO2 out of solution and you get foam. The fix is a longer line or a lower serving pressure.

What serving pressure should I enter? Most beers pour well around 10–12 PSI. Start by entering whatever carbonation pressure you already keep on the keg; the tool returns the line length that balances it.

Vinyl or polyethylene? At the same ID, polyethylene has lower resistance (about 2.2 PSI/ft at 3/16 in), so it suits longer trunk runs. For a short, direct-draw kegerator, 3/16 in vinyl is the popular default because its higher resistance keeps the run short.

How do I measure faucet height? Enter the vertical difference from roughly the middle of the keg up to the faucet. Above the keg is positive, below is negative. Each foot of rise adds about 0.5 PSI of back-pressure.

📚 The science behind a balanced pour

The "resistance per foot" idea spread through the homebrew community as DIY kegerators became common, and the figure of 3 PSI/ft for 3/16 in vinyl has been passed around for years as a working rule of thumb. A balanced system is usually aimed at roughly 2 oz per second — about one US pint in 8 to 12 seconds. Go faster than that and you tend to agitate the beer into foam; much slower and the pour drags. Because resistance changes sharply with material and bore, balancing by the numbers beats the old habit of "just cut it long and hope."