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Chafing Fuel Calculator

Enter your chafing dishes, burners, service hours and can burn time to see the cans needed.

How it is calculated

Each burner needs its own can, and a can is replaced when it runs out. First the service length is divided by the burn time of one can and rounded up: cans per burner = ceil(hours / burn time). Then cans = dishes × burners per dish × cans per burner. A second figure adds a spare stock of 10%: with spare = ceil(cans × 1.1), rounded up to a whole can. Dishes and burners must be whole numbers above zero; hours and burn time may have decimals but must be above zero. Because of the rounding up, a service that needs 2.1 can-lengths is counted as 3 cans per burner. The tool assumes all burners are lit for the whole service and that every can burns for the time you enter. Use the burn time printed on the can, not a guess.

Worked example

An event runs 6 chafing dishes with 2 burners each, for 5 hours, using cans that burn 2 hours. Cans per burner: 5 ÷ 2 = 2.5, rounded up to 3. Total cans = 6 × 2 × 3 = 36. Spare stock: 36 × 1.1 = 39.6, rounded up to 40. So you need 36 cans for the service, and 40 if you want the 10% spare. Note that the last can in each burner is only needed for 1 of its 2 hours, which is why the count looks generous.

Try this example →

Common mistakes

  • Entering the number of burners for the whole table instead of per dish. The tool multiplies burners by dishes, so a total of 12 typed with 6 dishes gives double the cans.
  • Entering the setup time as service time. Count the hours food must stay hot, from first serving to last.
  • Using 2 hours burn time for every brand. Burn time varies by can type, so read it off the can; a 4-hour can halves the result.
  • Entering the burn time in minutes. The field is in hours, and 120 would suggest a can lasting 120 hours.
  • Ignoring the rounding up. The count always uses whole cans per burner, so a 5-hour service with 2-hour cans needs 3, not 2.5.

About this calculator

Chafing fuel is the gel or liquid fuel — often sold under the generic name ‘Sterno-style’ cans — that burns under a chafing dish to keep buffet food above the safe holding temperature of roughly 60°C (140°F) for the length of a service. Each can burns for a fixed, labeled amount of time, commonly around two hours for a standard can, and a chafing dish typically needs one or two burners running underneath it depending on its size.

Caterers, event planners and restaurant buffet staff need to know in advance how many cans to bring so food doesn't drop into an unsafe temperature zone mid-service and no one is left improvising a fuel run during a wedding or corporate lunch. Getting the count right also avoids over-ordering fuel that then goes to waste, which matters for tightly costed catering jobs.

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