A friendly, honest guide to getting it right (and getting better every single week)

There’s a very specific moment that every market vendor knows. It usually happens the night before, somewhere between the last tray coming out of the oven and the moment you finally sit down. You look at everything you’ve made—loaves lined up on the counter, boxes of cookies cooling, jars labeled and stacked—and you wonder, “Is this enough… or did I just make way too much?”

That question never fully goes away. Even experienced vendors still feel it. But what does change, over time, is how you answer it. You stop guessing wildly and start making informed decisions based on a mix of math, observation, and a little bit of intuition earned the hard way.

Let’s walk through that together.

A Simple Formula That Gets You Close

There isn’t a single industry-standard formula that guarantees you’ll bring the perfect amount every time. Markets are too dynamic for that—weather shifts, customer habits change, and no two Saturdays are ever quite the same. But there is a reliable framework that most seasoned vendors use as a starting point:

Expected Customers × Conversion Rate × Units Per Customer = Total Units to Bring

It sounds technical, but it’s really just a way of organizing what you already know (or can reasonably estimate).

Start with foot traffic. Many markets publish attendance numbers, and if they don’t, other vendors are often happy to share what they’ve seen. A small neighborhood market might see a few hundred people, while a large, well-established one can draw thousands. That said, the number itself isn’t enough—you have to place it in context.

A sunny spring morning with mild temperatures and fresh produce everywhere tends to bring out a crowd that lingers, shops, and buys generously. That same market in the middle of a hot summer stretch might feel very different by 10:30am, when the heat pushes people to make quicker decisions or leave earlier altogether. Seasonality matters just as much as the raw number. If you’re planning for June, don’t base your expectations on October traffic.

Once you have a reasonable estimate of how many people will walk through the market, the next step is asking how many of them will actually buy from you. This is your conversion rate, and it’s where a lot of early overproduction happens. Not every passerby is a customer—some are browsing, some have already spent their budget, and some are simply there for the atmosphere.

A new vendor might convert somewhere around 5–10% of total foot traffic, while a more established booth with repeat customers and a strong presence can see 20–30% or more. Being conservative here is not a lack of confidence—it’s a way to protect yourself from unnecessary waste.

From there, you think about how much each customer typically buys. This depends heavily on your product. Someone buying a loaf of bread might take one or two, while a customer at a pastry booth may leave with a small box. A realistic estimate keeps the math grounded.

When you put it all together, it looks something like this:

• 1,000 visitors

• 15% conversion rate → 150 customers

• 2 items per customer → 300 items

At this point, you’re not done—you’re just close. Real life always requires a little flexibility, which is why most vendors add a buffer, usually in the range of 10–20%. That extra margin accounts for small surges in demand, unexpected rushes, or simply the peace of mind of not running out too early.

Why Your First Few Markets Matter More Than Any Formula

As helpful as that model is, it’s really just a starting point. The most valuable data you’ll ever have doesn’t come from estimates—it comes from your own booth.

Your first couple of markets are less about getting everything perfect and more about paying attention. What sold quickly? What lingered? What did people ask for that you didn’t have?

This is where your approach begins to shift. Instead of relying on projections, you start using your own numbers as your guide. You might notice that you sold through most of your inventory but ran out of your best-selling item early, or that one product consistently comes back home with you. Those patterns are incredibly useful.

Over time, your planning becomes much simpler and much more accurate. You begin to think in terms of:

Last market’s sales, adjusted slightly up or down

That adjustment might be based on something specific—warmer weather expected next weekend, a holiday crowd, or even just a feeling that your booth is gaining traction. It’s a quieter, more confident way of planning, and it only comes from showing up consistently and paying attention.

The Subtle Factors That Change Everything

Even with good data, there are a handful of variables that can quietly shift your results in a big way. These are the things that don’t always show up in a formula but absolutely deserve your attention.

Weather is one of the biggest. A mild, comfortable morning invites people to linger, browse, and make multiple purchases. Extreme heat, on the other hand, tends to shorten visits and reduce how much people buy at each stop. Rain is unpredictable—it can thin the crowd, but it often brings out your most loyal, intentional customers.

Market trends also matter more than people expect. Some markets grow steadily over time, attracting more vendors and more foot traffic each season. Others plateau or even decline. If you’ve been attending regularly, you’ll start to feel this shift. If you’re new, it’s worth asking around or observing for a few weeks before making big assumptions.

Seasonality ties into all of this. Spring and fall markets often feel vibrant and busy, while the height of summer can be more challenging depending on your location. Holidays can either boost attendance or pull people away entirely if they’re traveling. The key is to compare like with like—what worked in October might not translate directly to July.

And then there’s your product mix. Almost every vendor discovers, sooner or later, that not all items are created equal. A small handful of products will drive the majority of your sales, while others play a supporting role. Paying attention to that balance helps you refine not just how much you bring, but what you bring more of.

Thinking in Revenue Instead of Units

Sometimes it’s easier to flip the question entirely. Instead of asking how many items you should make, you can start by deciding what you’d like to earn.

If your goal for the day is $1,000 and your average item sells for $5, then you’re aiming for around 200 items. From there, you can adjust based on your typical sales patterns and the factors we’ve already discussed.

This approach can be surprisingly grounding. It keeps your focus on sustainability and profitability, rather than just volume, and it often leads to more intentional decisions about pricing and product selection.

A Quick Word About Capacity (Because It Matters More Than You Think)

It’s easy to get caught up in trying to meet potential demand, but your production capacity is just as important. There’s a difference between what you could sell and what you can realistically produce well.

If pushing for higher quantities means sacrificing quality, consistency, or your own sanity, it’s worth pulling back slightly. Customers come back for products they trust and enjoy, not just because your table was full.

In many cases, the better strategy is to operate just below your maximum capacity while maintaining excellent quality. As your systems improve and your process becomes more efficient, you can scale up naturally without overwhelming yourself.

The Rhythm You’re Building

At some point, this all starts to feel less like a guessing game and more like a rhythm. You estimate, you show up, you observe, and you adjust. Each market adds another layer of understanding, and your decisions become quieter, more confident, and more precise.

You’ll still have days that surprise you. You might sell out earlier than expected, or you might pack up with a little more than you planned. But those moments stop feeling like failures and start feeling like information—useful, actionable, and part of the process.

That’s really the goal here. Not perfection, but progress. Not getting it exactly right every time, but getting a little closer with each market you attend.

If you want help working through your own numbers, our Market Quantity Calculator is a great place to start. It takes the framework we’ve talked about and turns it into a quick, practical tool. But the real value comes from what you layer on top of it—your observations, your adjustments, and your growing sense of what works for you and your customers.

And that’s the part no calculator can replace