By Heidi Macomber · September 8, 2026 (updated October 13, 2026)

The license came in the mail, your first farmers market is Saturday, and everybody who has tasted your cookies says you should sell them.

So you looked at what the bakery in town charges, knocked a couple dollars off because you feel like an amateur, and called it a price.

That is how most cottage bakers start, and it is why so many of them are busy every weekend and still not making money. Being fully booked is not the same as being paid.

In this post I want to show you the math that tells you what a dozen of your cookies actually earns you, and how to do all of it yourself, for free, this week.

Here's how to do it yourself, for free

→ Cost out one dozen of your best seller, to the quarter-teaspoon. Not your whole menu. The product you sell most of.

→ Write down what you actually paid for every ingredient, using the receipt: the flour bag, the butter box, the vanilla bottle.

→ Convert each package into per-use amounts. A 5-pound bag of all-purpose flour holds about 17.5 cups. If the bag cost $3.49, one cup costs 20 cents ($3.49 divided by 17.5). Do that for every ingredient.

→ Add packaging. The box, the liner, the sticker, the label. Bakers leave these out because flour feels like a cost and a box feels like nothing. The box is a cost too.

→ Add your share of the market. Booth fee divided by the dozens you realistically sell per market, plus mileage. A $30 booth where you sell 30 dozen adds a dollar to every dozen.

→ Divide the total by your price. That is your food cost percentage.

That costs you nothing but an evening, and you can start it today.

A worked example

Chocolate chip cookies, one dozen, using example grocery prices. Plug in your own receipt.

ItemCost per dozen
Butter (2 sticks per 4.5-dozen batch, $4.99 a pound)$0.56
Flour (half a cup per dozen, 20 cents a cup)$0.10
White and brown sugar$0.17
Eggs (2 per batch, $4.50 a dozen)$0.17
Vanilla (2 teaspoons per batch)$0.22
Chocolate chips (one 12-oz bag per batch, $3.99)$0.89
Ingredients total$2.11
Packaging (box, liner, sticker)$0.85
Market share ($30 booth over 30 dozen)$1.00
True cost per dozen$3.96

Charge $12 a dozen and $3.96 divided by $12 is 0.33. About 33 cents of every dollar goes to the cookies, the box, and the booth. The other 67 cents pays you, covers your mileage, and builds the business.

Charge $8 and that same math is $3.96 divided by $8, or just under 50%. Half of every sale gone before you have paid yourself anything. A busy market at $8 a dozen can lose you money in front of a line of happy customers.

Why should you care?

Per-dozen cost is the cleanest signal in a cottage business, because it holds everything else constant.

Same recipe, same market, same Saturday, and one price hands you 67 cents on the dollar while the other hands you about 50. Whatever caused that gap is one decision you made at your kitchen table, and it is the only thing that changed.

The trap in the spreadsheet method

Here is the part nobody warns you about: ingredient prices move constantly, and a spreadsheet holds the old price until someone re-keys it.

Butter spikes before the holidays, flour creeps up in the spring, and the sheet still says you make $8 a dozen. If you sell 30 dozen before you catch it, every one of them earned you less than that $8, and nothing at the market tells you, because the cookies still sell out.

If your time is worth more than $14.99 a month, this is exactly what we built Percy Plate for.

You enter ingredient prices once, and every recipe gets an exact cost per dozen that updates when a price changes. Update butter and every cookie recipe moves with it, the same day.

You see suggested sell prices from your target food cost percentage, so when packaging or booth fees rise you know immediately what the new price needs to be.

And when your products need a nutrition label, Percy Plate generates it from your recipe instead of you typing it out by hand at 11 p.m. before market day.

Create your free account → Free forever, no credit card, takes 30 seconds. Pro is $14.99/month for menu engineering, inventory tracking, and labels on top.

If you are still deciding whether to start

Do the one-dozen exercise before you sign up for a single market. If the math says your best seller earns minimum wage, you want to know that at your kitchen table, not at the end of a season of early mornings.

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