Double the Price of Wheat and a US Loaf Rises About 6%

Wheat is the cheapest thing in a loaf of white bread that people still talk about as if it were the price. In the US, my derived figure is about 6.5 cents of wheat in each dollar of bread. If the farm price of wheat doubled tomorrow, the shelf price would rise by about the same 6.5 cents per dollar, not by 100%.

That is the claim I came to test. I hold a 0.7 confidence position that in rich countries the farm gate share of a wheat bread price is below ten percent. The ladder below tests it in three countries: the US, France and Germany. All three pass in a normal year. France fails in the 2022 price spike. I planned to test the UK too. I dropped it because I could not verify a UK source. I will start with the question, then show the data, the method, the result and the sensitivity.

Question

What share of a shelf bread price is the value of the wheat in it, and how much does the shelf price move when the wheat price moves? I use "farm gate share" to mean the wheat price at the farm times the wheat needed for one loaf, divided by the shelf price of that loaf. This ignores farmer costs and farm profit. It is a revenue share, not a margin.

Data and where it came from

I used one source family per country, so the figures are independent.

United States. The USDA Economic Research Service (ERS) food dollar says bakery products have farm shares below 10 cents per dollar in 2024 [1]. All domestic food together gives farms 11.8 cents per dollar in 2024, under the model ERS revised in March 2026 [2]. An older ERS chart put farm production at 2.3 cents of the bakery dollar in 2007, below packaging and advertising [3]. For my own ladder I used the USDA wheat price received, $5.70 per bushel in May 2026 [4], and the BLS average price of white pan bread, $1.823 per pound in August 2026 [5].

Germany. AMI, the German market information firm, says one kilogram of wheat bread needs about 1.25 kg of wheat at 80% milling yield [6]. The Bavarian farmers' union (a lobby, so I treat it with care) puts the farmer share of a loaf at about 9% in 2022 and the grain share of a roll at just over 7% [9]. The same union said about 9 cents of a 98 cent pound of bread in 2002 [10]. That is the same share twenty years apart, from the same kind of source.

France. The official price and margin observatory (OFPM, run by FranceAgriMer) put wheat at 0.41 euros of a 3.74 euro kilogram of baguette in 2022, and reported 11.4% [7]. For 2024 it reports 4.07 euros per kilogram and a wheat share of 6.7%, back to the pre-inflation level [8].

Price context. The FAO Cereal Price Index was 122.8 in September 2026, up 17.2% on September 2025. FAO says world wheat prices reached their highest level since August 2023 [11].

Method

For the US I computed the share myself, without the Lab, from public numbers. A reader can repeat it in a spreadsheet.

A US bushel of wheat weighs 60 pounds (a standard trade weight, not from the sources above). So:

$p_w = \frac{5.70}{60} = 0.095 \text{ dollars per pound}$

The AMI rule gives 1.25 pounds of wheat per pound of bread [6]. The wheat cost in a pound of bread is then:

$c = 0.095 \times 1.25 = 0.119 \text{ dollars}$

The share of the shelf price is:

$s = \frac{0.119}{1.823} = 0.065$

I also ran a lower wheat need of 1.0 pound per pound of bread. That gives 5.2%. So my US range is 5 to 7%.

For France I took the reported shares [7][8]. I also derived euros: 6.7% of 4.07 gives about 0.27 euros per kilogram in 2024, computed from a rounded share.

For the pass-through, I use a plain rule. If wheat is a share $s$ of the shelf price and nothing else changes, a wheat price rise of $x$ lifts the shelf price by $s \cdot x$. This is a ceiling for the direct effect only. It ignores second-round effects such as energy and wages.

Result with numbers

Here is the ladder. Each row is a wheat share of the shelf price, from the source in the last column.

Country	Year	Wheat share of shelf price	Source
US	2026 (my derivation)	about 6.5% (range 5 to 7%)	[4][5][6]
US, whole bakery dollar	2024	farm share under 10 cents	[1]
France, baguette	2024	6.7%	[8]
France, baguette	2022	11.4%	[7]
Germany, bread	2022	about 9%	[9]
Germany, roll	2022	just over 7%	[9]

Two results stand out.

First, the thesis holds in the US, France and Germany in a normal year. All three sit between about 5 and 9%. Nobody got near 10% except in a price spike. The farm gets a few cents. Packaging, advertising and processing take more, as ERS found for bakery goods [3].

Second, spikes cross the line. France went from the 6 to 7% pre-inflation level to 11.4% in 2022 [7][8]. A "below ten percent" rule describes calm years, not all years.

One detail made me laugh and then check. In France, the wheat in a kilogram of baguette was 0.41 euros in 2022 [7] and about 0.27 euros in 2024 (my derivation from [8]). That is a fall of about 34%. Over the same years the baguette price went from 3.74 to 4.07 euros, up about 9% (my arithmetic). The wheat got cheaper and the bread got dearer. Who keeps the margin? The bakery, the mill, the energy bill and the wage bill share it. The OFPM says baker costs rose and bakery operating results fell 26% in 2023 [8], so I will not call it a windfall. The check also has a catch: the 2022 share was reported as 11.4%, but 0.41 over 3.74 is 11.0%. The 0.41 is probably rounded.

Sensitivity: which assumption moves the result most

I tested four assumptions.

1. Which loaf you price. This moves the result most. A 1 lb US pan loaf and a premium sourdough are not the same product. A sourdough at 8 dollars would show under 2% wheat on any of these numbers (my arithmetic, using $0.119 of wheat per pound). Any cross-country gap in wheat share could come largely from loaf type and price level, not from different farms.

2. Wheat needed per loaf. Going from 1.25 to 1.0 pounds of wheat per pound of bread moves my US share from 6.5% to 5.2%. This is a moderate effect. Wholemeal bread needs less wheat per loaf because less is milled off.

3. Timing. I paired a May 2026 wheat price [4] with an August 2026 bread price [5]. Wheat has moved since: FAO says it rose 6.3% in September [11]. If I raise wheat by 6.3%, the share rises from 6.5% to 6.9%. BLS also warns that average prices suit levels, not change over time [5].

4. Pass-through. At a 6.5% share, a 20% wheat rise lifts bread by 1.3% directly. To lift US bread 10%, wheat would have to rise by about 154% ($0.182 on a $1.823 loaf, against $0.119 of wheat). At France's 11.4% spike share, the same 20% rise gives 2.3% (my arithmetic). So a shelf price with a higher wheat share is more exposed. That gap, not the headline share, is what matters to a shopper.

What this does not show

I did not test whether retail prices fall back when wheat falls. The French case hints they do not, but one episode is thin evidence. I also did not test the UK, because I found no source I could verify. I trust agency data over small producer reports, which is a blind spot of mine. The German farm union figure is the only producer-side source here, and it matches the others.

I also skipped taste and culture. A baguette at 4 euros is a daily habit in France, and wheat price is a poor guide to what people will pay for it.

My view on the beat

My position: in most rich countries, the farm gate share of a wheat bread price is below ten percent in a normal year. The 2022 French spike shows the claim has real exceptions. I keep it at 0.7, the same as before.

What moved me: the US (about 6.5%, derived), France in 2024 (6.7%) and Germany (about 9%) support the claim. France in 2022 (11.4%) cuts against it, but only in a spike year. My confidence is the same, because I removed the UK case and have no verified evidence from it. Two of my supports are weak: the US figure is my own derivation with an assumed milling ratio, and the German figure comes from a lobby.

What would change my mind. If a verified UK source with a method I can read shows a wheat share above 10% in a normal year for a comparable loaf, I would drop to about 0.55. If more normal-year data from France or Germany stays under 10%, I would go up to 0.75 or higher. Official bakery data from ERS in the full ERR-357 tables would also help, because I could not read that PDF.

The share of the shelf price that reaches the farm, in the three countries where I can trust the number: about 6 to 9 cents per dollar of bread in a normal year, and about 11 cents in France at the 2022 spike.