How many kilos of bread can I produce with one kilo of flour?

In my experience, it doesn't really save money, but it's still worth it because it's fresh and better than store-bought at the same price.

For me, 1kg of all purpose flour yields 1.6kg of bread (as two loaves). Each 13x4x4" (Pullman) loaf weighs about 800 grams after cooling and yields between 24-30 slices depending on thickness. The cost per loaf is under $1.00, and includes all ingredients, tax, and electric for mixing/baking/slicing.

I've made a few hundred loaves based on variations of this formula:

                      %  grams   cost  cals fat protein sugar sodium
all purpose flour    100  500   0.417  1833   0      50    17      0
    instant yeast    0.8    4   0.067    16   0       0     0      3
  nonfat dry milk      4   20   0.203    70   0       7    10    109
       canola oil     10   50   0.072   429  50       0     0      0
            sugar      4   20   0.019    75   0       0    20      0
             salt      2   10   0.006     0   0       0     0   3933
            water     56  280   0.000     0   0       0     0      0
      dough total  176.8  884  $0.783  2422  50      57    47   4045

To be clear, I no longer use a bread machine. My answer focused more on how much bread can be made with 1kg flour. The Pullman loaf pan was $25, and the electric knife was $20. So for 300 loaves, that adds 15 cents per loaf. The mixer and oven are used for other things besides bread, so I don't really consider them in the overall cost per loaf.

It would depend greatly on the recipe used. However, for example, this recipe from Jamie Oliver for "Basic Bread" yields 1 loaf of bread and utilizes 1kg of flour. Additionally if you are comparing for economic reasons, you'd also need to take into account the cost for yeast, salt and any enrichments (egg, sugar, etc as specified by recipe).

The average loaf of store bought bread weighs either 16oz or 24oz here in the US which would be 453.6g or 680.4g respectively. I know that until 2008 bread in the UK was required by law to be sold in specified units so they were commonly sold in 400g and 800g sizes. Most of my bread books specify that on average bread dough loses 10-20% of weight during baking/cooling.

So some "back of napkin" math gives us

1kg flour = 1000g

625ml H20 = 625g

21-30g yeast = 25g (average)

2 tbsp sugar = 30g

1 tbsp salt = 15g

Total dough weight = 1695g

1695 - 169.5 = 1525.5g (10% loss during cooking)

1695 -339 = 1356g (20% loss during cooking)

(1525.5 + 1356)/2 = 1440.75g average cooked weight.

So we can estimate that the average weight of a cooked loaf of bread from this recipe would be 1.44kg.

Basic bread requires flour, water, salt and yeast (nothing more).
The salt and yeast contribution to the weight is negligible. Water, in my experience, shall be - before cooking - about 70% in weight with respect to flour; the actual quantity depends mainly on the kind of flour, but 70% is a reasonable average estimate.
Loss of total weight during cooking is due to water evaporation and can be estimated between 10% and 20%; the bread will anyway continue to loose water even after it reaches room temperature, but this is slow.

In conclusion I would say, for example:
1 kg of flour + 0.7 kg of water (I use kg, I am Italian) => 1.7 kg dough
1.7 - 1.7*15% kg => 1.445 kg
In Italy flour can be found for sale at less than 0.50 €/kg, yeast (for 1 kg of flour) 0.15 €, water, salt, electric power: negligible cost;
Total 0.65 €/1.445 kg = 0.45 €/kg = 0.45 €/kg;
In comparison 1 kg of bought basic bread is around 2.5 to 4 €/kg.
If you do not take into account oven, etc and the work needed, in Italy it is very convenient to make it by yourself!

flour/water : 100:50 - 100:65 as you like the dough -> 1kg flour : 1,5kg -1,65kg dough.

You have 10% loss of weight by backing.

Thats all.

Here in the UK, I can use 1/3rd of a 1.5kg bag of strong white bread flour (95p/3=32p) and 1 sachet of dried yeast at 11p to make a loaf for 43p, and that gives me a loaf equivalent to this 800g supermarket sandwich loaf at £1.00. Tastes better, too.

So that's better than double, in my experience.

For me,1 kilo will yield 2 kilograms of bread,,,ex.for 1 kilo I put 700 grams of water,plus the ingredients, here is my example;

Marikina bread 1 kg salt 75 g sugar 155 g shortening 85 g yeast 80g improver 25g eggs 2 fl ounce skimmed milk 15 g water 700 g