The item
One stock line at a time. The name you give a unit is used in every answer below.
Singular, and the plural is made from it. Every quantity on this page will be written in units rather than in units.
What you are holding
What is in the building today, and what is already on its way.
What you could sell today, counted rather than what the system says.
Already on order
OptionalConfirmed purchase orders and their expected arrival date. Stock on order only prevents a stockout if it lands before the shelf is empty, and that is what the date is for.
How fast it goes
An ordinary rate of sale or use. Everything on this page is worked from it.
A steady rate. Nothing here knows about your busy season, a promotion or a single large order, and a line that moves in lumps will need the answers read with that in mind.
Your supplier
How long a replenishment takes, and the rules they sell under.
From placing the order to the goods being on your shelf, including clearing and delivery.
Minimum order and pack size
Optional. Often the reason an order is larger than the business needs.
The buffer you want to keep
Stock held back for a busy week or a late delivery.
A buffer in days rises with demand, so it holds the same cover in a busy month.
What a delivery should restore you to
Days of cover you want on the shelf once an order has landed, on top of the buffer.
What it costs you
Optional. Turns the order quantity into a cash decision.
The reorder point and the order quantity are worked out without it. Adding it answers the second question every owner asks after "do I need it", which is whether they can fund it.
Days of stock on hand
Nothing entered yet
Enter what you are holding and how fast it sells, and the days of cover, the reorder point and the order to place appear here as you type.
What you will get
Fill in what you are holding and how fast it sells, and the answer appears here as you type.
- How many days of stock you have, on the shelf and including anything already on order
- The date this line is projected to run out, and the date the next order has to be placed
- Your reorder point, and whether an order placed today would even arrive in time
- How much to order, worked from what will be left when it lands rather than what is there today
- What that order would cost, and how many days of stock it would leave you holding
- What a busier month does to all of it
Doing this line by line?
This calculator answers for one item, from figures you type in. A business carries hundreds.
OraOS Business connects sales, stock movements, purchases and suppliers, so cover and replenishment can be seen from the records the business is already keeping as it trades, across every line at once.
- Rate of sale from the sales themselves, line by line
- Stock on hand from the movements rather than from a count
- Purchase orders and their dates already in the system
- The lines about to run out, without asking about each one
A separate product, with its own pricing and its own pilot. This calculator stays free either way.
Ora Account
Coming soonSave stock lines, compare results and reopen your work across Ora Tools when the Ora Account launches. It will be free.
Nothing on this page asks you to sign in, and nothing you enter leaves your browser today.
What the account will doOra Tools Pro
Coming soonSaved lines, every item reviewed at once, reorder history, supplier performance against the dates they promised, and export to PDF and spreadsheet are intended for Pro.
None of it exists yet, and no price has been set. The calculation on this page is complete and free, and will stay that way.
Free and Pro, comparedYour calculation runs in your browser. The figures you enter, including what you sell, what you hold and what you pay for it, are never sent to Ora, and are kept only in this browser so that a refresh does not lose them. Clearing the form removes them. Like any website, Ora Tools counts anonymous page views, which carry nothing you typed. Every figure on this page is arithmetic on what you entered, at a steady rate of sale, not a forecast of your market.