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This free open-to-buy calculator shows how much stock you can still order for each month of your plan, in your currency. Planning $12,000.00 of sales in February and ending the month with $34,000.00 of stock, from $30,000.00 at the start and $9,000.00 already on order, leaves $7,000.00 open to buy.
Amounts are rounded to the cent before they are added up, so the months always add up to the total.
Total open to buy $9,000.00.
The link holds only these numbers, nothing personal.
Open to buy (OTB) is the amount of stock a buyer can still order for a month without going over the inventory plan: planned sales + planned end-of-month inventory − beginning-of-month inventory − stock on order. It turns a sales plan into a buying budget for each month.
It is a budget, not a forecast. Buyers set it from the sales and stock plan, spend it as they place orders, and work it out again when sales run ahead of or behind plan.
Add planned sales to planned end-of-month inventory, then subtract beginning-of-month inventory and anything already on order. For February: $12,000.00 + $34,000.00 − $30,000.00 − $9,000.00 = $7,000.00.
Each month starts with the previous month's planned ending inventory, so March starts with $34,000.00, and the calculator carries it forward for you. If you plan markdowns, add them to planned sales, because they also take value out of your stock.
A negative open to buy means you are overbought: the stock you have and have on order is more than the plan needs for that month. In the example, April is overbought by $6,000.00.
Buyers deal with it by moving or cancelling deliveries where their terms allow, shifting stock between stores, planning promotions or holding back orders in the months that follow. Raising the sales plan to make the numbers work only helps if the sales are really there.
Either works, as long as every figure in the plan uses the same basis. Planning at retail ties the budget to the sales plan, while planning at cost ties it to what you will actually pay suppliers, so pick the one your sales and stock reports already use.
A store's open to buy is the budget your line competes for, so an order is easier to win while that budget is still open. Ask buyers when their budget for a season opens and how much is already committed, and plan your line sheets and appointments before it is spent.
Help buyers fit you into their plan with clear delivery windows and minimums, and with how your styles have sold elsewhere. The sell-through rate calculator and the wholesale price calculator help you bring those numbers.
Amounts are rounded to the cent, or to whole units in currencies without cents such as the Japanese yen, before they are added up. The sums are done in whole cents, so the months always add up exactly to the total.
Updated October 6, 2026
Go from unit cost to wholesale price and MSRP, with case packs and minimums.
Get margin, markup and profit from a cost and a price, or price a style to a target margin.
Add a markup to a cost to get a price, or see the markup a price gives you.
See how much of a delivery has sold, the weekly rate and the weeks of stock left.
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