There are two ways a market day goes sideways before you even arrive. You bring too little and sell out by noon, turning away regulars and leaving money on the table. Or you bring too much and drive home with a car full of stock and the cash and materials still locked up inside it. Both come from the same gap: planning production by gut feel instead of by the calendar. The fix is a little arithmetic that almost nobody teaches.
Every product has a lead time, so plan from the date backward
Lead time is just the gap between "start making" and "ready to sell." Candles need to cure. Soap needs to age. Jam needs to set and label. Pottery needs to dry, then fire, then glaze, then fire again. The mistake is deciding to start when you feel the market getting close. The fix is to count backward from the market date.
If your market is two Saturdays away and your candles need fourteen days to cure, the start line isn't "soon," it's today, and a day late means a shelf with nothing on it. Counting backward turns a vague worry into a clear instruction: start by this date, or it won't be ready, full stop.
The deadline that's already passed
Here's the sharp edge of lead-time math, and the reason it's worth doing early. If a market is ten days out and your product needs fourteen to be ready, you cannot make more for that market. The decision was already made, quietly, four days ago. Knowing your lead times means you discover that in time to plan around it, instead of finding out the night before while staring at soap that won't be ready.
How much to make: sell-through, not hope
For the quantity, start from what actually happened last time at a similar market, not from optimism. If you usually sell about thirty candles at this fair, make thirty plus a small cushion for a good day. The cushion is safe precisely because of the next idea.
Leftovers aren't waste if they're just early
A durable product that doesn't sell today isn't a loss, it's inventory for next weekend. That changes how much risk a little extra carries. So the real question isn't "how much will this one market take," it's "how much can I sell across the next few markets," and you make to that, in waves timed to each date. Perishables are the exception, and they're where tight planning matters most, because a tray of unsold baked goods is a real loss, not an early start.
Stagger your batches to land in waves
With several markets on the calendar, the goal is to have things come ready in a rhythm that matches the dates, not all at once and not too late. Start the slow-curing things first, the quick ones last, so everything peaks fresh and ready right as each market arrives. That's the whole game: the right amount, ready at the right time, again and again.
Selling out feels like success and overstocking feels like failure, but they're the same mistake wearing different clothes. The cure for both is knowing your lead times.
This is the exact problem Wares was built around, and the reason it thinks in lead times when other tools only think in stock. You set a lead time once for each thing you make, and the app counts backward for you, shows what will be ready before each market, and prompts you to start in time. It's free to try, right in your browser.