Inventory how-to

How to scale up orders after a successful test

Scale up in steps, not in one jump.

Short answer: Scale up in steps, not in one jump. Use the sales rate from the test window to set a new reorder point and order quantity, then raise it again once the bigger batch proves out. Watch supplier lead time and cash tied up in stock as you grow the order size.

Why scaling needs a plan, not a guess

A successful test tells you demand at a small volume. It does not tell you demand at ten times that volume. Prices, shipping speed, and even customer behavior can shift once a product is no longer scarce. Scale the order size in steps so you can correct course if the bigger batch does not sell at the same rate.

Recalculate your daily sales rate first

Throw out your gut feeling and use the actual numbers from the test period. Take total units sold divided by days the product was in stock and available. If the product sold out and sat at zero for part of the window, do not count those zero-stock days in the average, or you will understate demand.

Build in safety days for the bigger order

A bigger order usually means a bigger supplier run, which can mean a longer or less predictable lead time. Ask the supplier directly what lead time applies at the new volume, and add safety days on top to cover delays. Do not reuse the lead time from the small test order if the new order is a different scale of production.

Scale in stages, not all at once

Go from test size to a moderate reorder, not straight to a year of stock. A 2x or 3x step lets you confirm the trend holds before you commit serious cash to inventory. Each stage gives you a fresh, bigger sales sample to base the next order on.

Step by step

  1. Pull total units sold and days in stock from the test run, and calculate daily sales rate excluding any stockout days.
  2. Confirm the supplier's lead time and minimum order quantity at the new, larger volume, since these can differ from a small test order.
  3. Set safety days based on how reliable that lead time is, and widen it if the supplier is new to running this volume.
  4. Calculate order quantity as daily sales x (lead time + days of cover) minus stock on hand and on order.
  5. Round the result up to the nearest case pack or supplier minimum.
  6. Place an order that is a moderate step up from the test, such as 2x to 3x, not a full year of stock in one go.
  7. Track sell-through on the bigger batch and repeat the calculation before placing the next, larger order.

Worked example

A store tests a new candle with 40 units and sells all of them in 20 days of availability, giving a daily sales rate of 2 units. The supplier's lead time at small volume was 10 days, but at the next order size they quote 20 days plus the store adds 5 safety days. Order quantity = 2 x (20 + 5) - (0 on hand + 0 on order) = 50 units. The store rounds up to the case pack of 60 and places that order, planning to reassess once those 60 units have sold through part of their run.

How SteadyShelf helps

SteadyShelf can calculate the new order quantity and order-by date automatically once it has sales history from the test, using your supplier's lead time and safety days, and it will round to case packs and minimums for you. It will not tell you whether to trust the test result or how big a jump to take, that judgment call is still yours.

$29/month flat, unlimited products and suppliers, 30-day free trial. Run the numbers now with the free reorder point calculator.

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FAQ

What if the supplier can't commit to a lead time for the larger order yet?

Use their worst-case estimate, not their best-case one, and add extra safety days on top. It is better to order a bit early than to run out while scaling up and lose the momentum from the successful test.

Should I order enough to cover a whole season in one go once a test works?

No. Ordering a full season of stock off one short test is a common way to end up with excess inventory if the trend does not hold. Step the order size up gradually and base each new order on the latest real sales data.

Let SteadyShelf do this math for every SKU

Order-by dates per supplier, seasonal forecasts and draft POs for your Shopify store. $29/month after a 30-day free trial.

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