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Brick Oven Caculator !!

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  • Brick Oven Caculator !!

    Firebricks calculations

    One of the important purchases for the oven are the refractory bricks. You need to properly estimate the number of bricks based on the design you choose. A good idea is to roam around the different forums and see what people have used for similarly sized oven. This should give you a pretty good idea of what is needed. If you have a 3d model, that's even better, you can also do some calculations to get a rough estimate.

    A rough estimate of the number of firebricks can be simply calculated with the following kindergarten formula:

    Num bricks = Area/brick area
    I used firebricks in three parts: the oven hearth, the dome and the door arches.
    Depending on whether the bricks would be tapered on all four sides or not slightly influences the final count.
    In my case, the bricks dimensions are 22x11x6 (units in cm - yes I'm using the ever popular metric system!) and I'm using mostly half bricks (up to the 10th layer), whose section would be 11x6
    • oven hearth: Surface = Π* Re2
      with Re: external radius = internal radius + brick width = 46cm + 11cm = 57cm
      Surface = Π*572 = 10201 cm2
      For the hearth, the bricks are laid on their wide surface whose area is 11cm x 22cm = 242cm2. The number of bricks would then be = 10201/242 ≈ 42 full bricks
    • oven dome:
      An ellipsoid surface can be calculated using this ellipsoid area calculator where you provide a=b (dome radius) and c for the dome height

      There are two cases:
      • non tapered bricksThe bricks section fits the interior of the dome and in this case I have a=b=46 cm and c=38, which yields&nb p;for a half ellipsoid ≈ 23562/2 = 11781 cm2 which corresponds to about 11781/(11*6) ≈ 179 half bricks = 90 full bricks
      • tapered bricks
        Here the bricks section fits the exterior of the dome and a=b=46+11=57
        and c=38+11=49, which gives a dome surface of 18533 cm2 which corresponds to 18533/(11*6) ≈ 280 half bricks = 140 full bricks
    • The door has an opening of 46 cm (w) x 25 cm (h), and requires two arches made with around 20 firebricks
      The total number of bricks is approximately:
      non tapered bricks: 42 + 90 + 20 ≈ 150 bricks
      tapered bricks: 42 + 140 + 20 ≈ 200 bricks
    My initial plan was to use tapered bricks and I estimated about 200 bricks both with the 3d model and my calculations. I bought 220 bricks and was left with around 25 units.
    Firebricks calculator

    Now just for fun, here's a firebrick calculator I wrote, just enter your numbers and it will spit out an estimate of the number of bricks you need for the dome + hearth. The actual number will be slightly lower as it doesn't consider the entry area where there are no bricks. But this is slightly compensated by the entry arch bricks (the one supporting the dome) as they are not included in the calculations.
    This works in any units, as long as you use the same for all dimensions. You can even use parsecs if you like, but that might not be practical.

    Dome radius Dome height Brick width Brick height Brick depth Tapered bricks
    Dome area Dome bricks
    Hearth area Hearth bricks
    Total area Total bricks