Keg Calculator
How many kegs for your party, wedding or event, with a cans vs keg cost check.
Typical mixed crowd: 50–70%
The keg mix is the cheapest combination that covers your total at these prices. Clear a price to hide it from the comparison.
Keg sizes: ½ barrel (full-size) ≈ 165 × 12 oz · ¼ barrel (pony) ≈ 82 × 12 oz · ⅙ barrel (sixtel) ≈ 55 × 12 oz
Please drink responsibly and arrange safe rides home for guests.
About the Keg Calculator
How many kegs for 100 guests? For a 4-hour party where about 60% of the crowd drinks beer, you need 2 half-barrel kegs, which is roughly 300 cups of 12 oz each. This keg calculator works it out for any guest count. Tell it how many people are coming, how long the party runs, how hard the crowd drinks and whether you pour 12 oz cups or 16 oz pints. It then finds the cheapest mix of ½, ¼ and ⅙ barrel kegs that covers the total with a 10% foam allowance. It also shows how many 24-can cases would do the same job, so you can see whether kegs or cans cost less at your local prices.
How many kegs for 100 guests?
2 half-barrel kegs for a 4-hour party, assuming about 60 of the 100 guests drink beer at an average pace. That is 60 beer drinkers × 5 drinks = 300 cups of 12 oz. Two half kegs pour about 300 cups once you allow 10% for foam. The margin is tight, so round up if your crowd leans heavy.
- 5-hour party: 360 cups, so 2 half kegs + 1 quarter keg.
- Pouring 16 oz pints for 4 hours: 3 half kegs.
- Nearly everyone drinks beer (100%) for 4 hours: 500 cups, so 3 half kegs + 1 sixth barrel.
The calculator uses one simple rule for each beer drinker: 2 drinks in the first hour, then 1 drink every hour after that. The light pace is 1 drink, then 0.5 an hour. The heavy pace is 3 drinks, then 1.5 an hour. It adds 10% to the keg volume for foam, the first pours and the dregs left at the bottom. Cans get no foam allowance.
Keg sizes and how many servings each one holds
| Keg size | Gallons | 12 oz cups | 16 oz pints | 12 oz cups after 10% foam | Same as (24-can cases) |
|---|---|---|---|---|---|
| ½ barrel (full-size) | 15.5 | 165 | 124 | 150 | 6.9 |
| ¼ barrel (pony) | 7.75 | 82 | 62 | 75 | 3.4 |
| ⅙ barrel (sixtel) | 5.16 | 55 | 41 | 50 | 2.3 |
A US beer barrel is 31 gallons, so the "half keg" everyone rents for parties really is half a barrel. Pony kegs are hard to find at some stores. Sixth barrels are common for craft beer and for adding a second style to the table.
How many kegs for 50, 100, 150, 200 and 300 guests
Every row below assumes 60% of guests drink beer at an average pace, poured in 12 oz cups, with the keg mix priced at $130 / $85 / $65 for half / quarter / sixth barrels. Change any of those assumptions in the calculator above and it recalculates.
| Guests | 12 oz servings (4 hr) | Kegs for a 4-hour party | Kegs for a 5-hour party | Cases of cans (4 hr / 5 hr) |
|---|---|---|---|---|
| 50 | 150 | 1 half | 1 half + 1 sixth | 7 / 8 |
| 75 | 225 | 1 half + 1 quarter | 2 half | 10 / 12 |
| 100 | 300 | 2 half | 2 half + 1 quarter | 13 / 15 |
| 150 | 450 | 3 half | 4 half | 19 / 23 |
| 200 | 600 | 4 half | 5 half | 25 / 30 |
| 250 | 750 | 5 half | 6 half | 32 / 38 |
| 300 | 900 | 6 half | 7 half + 1 sixth | 38 / 45 |
The pattern is easy to remember. At this pace, one half keg covers about 50 guests for 4 hours. Each extra hour adds about 20% more beer.
Worked example: a 150-guest wedding, 5 hours, 60% beer drinkers
- Beer drinkers: 150 × 60% = 90 people.
- Drinks each: 2 in the first hour + 1 an hour for the next 4 hours = 6 drinks.
- Total servings: 90 × 6 = 540 cups of 12 oz, or 6,480 oz of beer.
- Add 10% for foam: 6,480 × 1.10 = 7,128 oz, which is 3.6 half kegs' worth.
- Pick the keg mix: 3 half kegs plus a quarter only reaches 6,944 oz, which is short. 3 halves + 1 quarter + 1 sixth covers it but costs $540. 4 half kegs ($520) is cheaper and leaves about 60 spare cups.
- Cans instead: 540 cans means 23 cases of 24, which costs $552 at $24 a case.
If the bar pours 16 oz pints, the same wedding needs 5 half kegs. That is why the serving size matters as much as the guest count.
Kegs vs cans: which costs less?
Using the example prices above, a half keg works out to about $0.87 per usable 12 oz cup ($130 ÷ 150). A $24 case works out to $1.00 per can. For the 100-guest, 4-hour party that means $260 in kegs against $312 in cans. Kegs also bring costs that cans don't:
- Keg deposit: usually refundable, often $30 to $100 per keg, plus a deposit on the tap.
- Tap and tub: a hand pump is often free or a few dollars to rent. A jockey box or kegerator costs more.
- Leftovers: an unfinished keg on a hand pump goes flat by the next day. Unopened cans keep for months.
For crowds under about 40 beer drinkers, or when guests want several styles, a mix of one keg plus a few cases is often the easiest option.
Tips before you order
- Match the tap to the keg. Most US domestic kegs use a standard "D" Sankey coupler. Some imports and craft kegs need a different one, so confirm when you pick up.
- Keep it cold from pickup to last pour. Warm beer foams, and foam is wasted beer. Set the keg in a tub or trash can, pack ice around it and top up the ice every few hours on a hot day. Let the keg settle for an hour or two after the drive before tapping it.
- Pump gently. Over-pumping a party tap is the #1 cause of foam. Pump only when the flow slows.
- Ask about returns before you pay. Some stores refund an unopened keg if you return it quickly. A tapped keg is almost never refundable. Bring back the empty shell and tap on time to get your deposit back.
- Order a few days ahead for weekends and holidays. Half kegs of popular brands sell out.
Please serve responsibly: offer water and food, stop serving anyone who is intoxicated, and make sure every guest has a safe ride home.
How to use the Keg Calculator
- 01Enter your guest count (or tap a quick preset) and the share of guests who will drink beer. 50 to 70% is typical when wine and cocktails are also served.
- 02Set how many hours the bar is open and pick a drinking pace. Average means 2 drinks in the first hour and 1 per hour after that.
- 03Choose 12 oz cups or 16 oz pints. Pints use about a third more beer for the same number of drinks.
- 04Check or edit the keg and case prices. The calculator picks the cheapest keg mix that covers your total and compares it with buying cans.
Frequently asked questions
How many beers are in a keg?
A full-size half-barrel keg holds 15.5 gallons, or 1,984 oz. That is about 165 cups of 12 oz or 124 pints of 16 oz. Allow roughly 10% for foam and you get about 150 cups. A quarter barrel (pony keg) holds about 82 cups of 12 oz, and a sixth barrel holds about 55.
How many people does a half keg serve?
At an average pace over 4 hours, each beer drinker has about 5 drinks. So one half keg (about 150 usable 12 oz cups) covers around 30 beer drinkers. That works out to about 50 guests if 60% of them drink beer.
How many kegs do I need for 150 guests?
For a 4-hour party with 60% beer drinkers, you need 3 half kegs (450 cups of 12 oz). For a 5-hour wedding reception, the same crowd drinks about 540 cups, which needs 4 half kegs. If you pour 16 oz pints for 5 hours, you need 5 half kegs.
How many kegs for 200 people?
Plan on 4 half kegs for a 4-hour event and 5 half kegs for a 5-hour event, assuming 60% of the 200 guests drink beer at an average pace. If nearly everyone drinks beer, run the calculator at 90 to 100%. The count goes up by more than half.
Is it cheaper to buy a keg or cans?
For mainstream domestic beer, kegs usually cost less per serving. For example, a $130 half keg pours about 150 usable cups, which is roughly $0.87 each. A $24 case of 24 cans works out to $1.00 a can. On top of that, kegs need a refundable deposit (often $30 to $100) and a tap. For small parties or pricey craft beer, cans often win.
How long does beer stay fresh in a keg?
With a hand-pumped party tap, which pushes air into the keg, plan to finish it the same day. Beer starts tasting flat and stale within about a day. On a CO2 system kept cold, pasteurized domestic beer usually stays good for about 6 to 8 weeks. Unpasteurized craft beer lasts closer to 3 to 4 weeks.