How long is your cash stuck in the business?

Total sales for the last 12 months before expenses. Use the top line of your profit and loss statement, labeled revenue, sales or income.

What the goods or materials you sold cost you over 12 months. On your profit and loss statement this is cost of goods sold or cost of sales.

The value of the stock or materials you normally keep on hand, at what you paid for it. Use your last inventory count or your balance sheet.

The total your customers owe right now on invoices you have already sent. Your accounts receivable or aging report shows this total.