How many bottles for 5 gallons of beer?
Fewer than every chart says, because "5 gallons" is what went into the fermenter and bottles are filled from what comes out of the bottling bucket. Between the two, some beer stays with the yeast cake and some stays in the bucket and the hose. The arithmetic is the last two lines of the same water ledger the brew-day tools use, and your equipment profile already holds the first of those losses:
| Step | US default profile | Metric default profile |
|---|---|---|
| Into the fermenter | 5.5 gal | 21 L |
| Stays with the yeast (fermenter loss) | −0.5 gal | −2 L |
| Stays in the bottling bucket and hose | −0.25 gal | −1 L |
| Into bottles | 4.75 gal | 18 L |
| 12 oz / 330 mL bottles | 50 (the chart says 59) | 54 × 330 mL · 36 × 500 mL |
Default profiles: 5.5 gal / 21 L into the fermenter, 0.5 gal / 2 L fermenter loss, a quarter gallon / 1 L bottling loss. Computed by this page's engine.
A 5.5-gallon batch fills 50 twelve-ounce bottles, not 59. The "5 gallons" of the classic question, run through the same ledger, is 45 — nine short of the 54 on every chart, which is the difference between two cases and three.
Why "54 bottles" is the wrong number
Every ranking page does the same sum — 640 ÷ 12 = 53.3, round up — and then, a paragraph or a section later, says losses exist. The two never meet. Miss Vickie's calculator defaults to a 10 % loss and headlines "54 twelve-ounce bottles" (its own default makes it 48). Thedrinksproject rounds up to 54 in its key takeaways and says "about 48 bottles instead of the 54" four sections down. Brewer's Friend prints 54 and warns "there will always be less than 640 ounces… because of losses in the hose, and whatever is left at the bottom." All true. None of them subtract. Here's what subtracting does to 5 gallons:
| Fermenter loss | Who assumes it | 12 oz bottles | …and the bucket's 0.25 gal |
|---|---|---|---|
| 0 gal | Every chart: 640 ÷ 12 | 53 | 50 |
| 0.5 gal | Beer & Brewing’s "~0.5 gal to trub" tip; this site’s default | 48 | 45 |
| 0.75 gal | Miss Vickie’s 0.5 + 0.25 transfer | 45 | 42 |
| 1 gal | thedrinksproject’s "0.5 to 1 gallon" | 42 | 39 |
5 gal into the fermenter. Whole bottles; the fraction left over is a glass for the brewer. Computed by this page's engine.
The count is exactly as good as the fermenter-loss number, and that number is yours, not a chart's: a conical dumps less than a bucket, a dry-hopped IPA leaves more than a lager, a 6.5-gallon carboy with a hop bag is its own case. On bottling day, before you add sugar, read the volume in the bottling bucket (graduations on a bucket are worth checking with a gallon jug once). Subtract it from what went into the fermenter, and the difference is your fermenter loss. Save it to the profile and every tool on this site — total water, priming sugar, this one — uses it from then on.
How many bottles per batch size?
With the default losses (0.5 gal / 2 L in the fermenter, a quarter gallon / 1 L in the bucket) — whole bottles you'll actually fill:
| Into the fermenter | Into bottles | 12 oz | 330 mL | 500 mL | 22 oz bomber | 750 mL |
|---|---|---|---|---|---|---|
| 3 gal · 11.4 L | 2.25 gal · 8.5 L | 23 | 25 | 17 | 13 | 11 |
| 5 gal · 18.9 L | 4.25 gal · 16.1 L | 45 | 48 | 32 | 24 | 21 |
| 5.5 gal · 20.8 L | 4.75 gal · 18 L | 50 | 54 | 35 | 27 | 23 |
| 21 L · 5.5 gal | 4.77 gal · 18.1 L | 50 | 54 | 36 | 27 | 24 |
| 23 L · 6.1 gal | 5.3 gal · 20.1 L | 56 | 60 | 40 | 30 | 26 |
| 25 L · 6.6 gal | 5.82 gal · 22.1 L | 62 | 66 | 44 | 33 | 29 |
| 10 gal · 37.9 L | 8.75 gal · 33.1 L | 93 | 100 | 66 | 50 | 44 |
10 gal uses a 1 gal fermenter loss. Nominal fill volumes. Computed by this page's engine.
Mixing bottle sizes
Big bottles for gifts and the rest in twelve-ouncers is the normal plan, and it's just the ledger with a subtraction in the middle: twelve 750 mL bottles take 2.38 gal off the top of the default batch's 4.75 gal, and what's left fills 25 twelve-ounce bottles with 108 mL over. The calculator's "some big, the rest small" mode does this for any pair of sizes, and refuses to plan more big bottles than there is beer.
How many bottles do I need to own?
More than you'll fill. Some are cracked before you start, one breaks under the capper, and one gets knocked over full. Ten percent is the usual margin: 50 bottles to fill means owning 55, which is 3 cases of 24. Then the awkward part: the 51th bottle. A 5.5-gallon batch leaves 236 mL after the last full one — 67% of a bottle. Don't bottle it. Under-filled bottles carbonate unpredictably (more headspace, same sugar); that one's the brewer's glass, uncarbonated, on bottling day.
Twenty-four twelve-ounce bottles hold 2.25 gal (8.5 L). Two cases is 4.5 gal of beer, which — run backwards through the ledger — needs 5.3 gal into the fermenter with the default losses. That's the reverse mode on the calculator, and it's the honest answer to "I have 48 bottles, how big should I brew?" — not 5 gallons.
I ran out of bottles — or had a case left over
Both mean the same thing: the number you divided wasn't the number in the bucket. Ran out with beer still in the bucket? Your fermenter loss is smaller than you assumed — a conical, a clean-fermenting lager, a carboy you tilted. A case of clean empties left over? It's bigger — a hop-heavy IPA, a bucket you were careful not to disturb, a batch that boiled off more than the profile expected so less went in to begin with. Either way the fix is the same and it's free: read the bucket next time, save the number, and hand the packaged volume — not the batch size — to the priming calculator. Priming for 5 gallons of beer that is really 4.75 over-carbonates by about 5 %; not dangerous, but not the beer you designed either.