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The cash conversion cycle measures how many days it takes for a dollar spent on inventory or production to come back to you as cash from a customer. The shorter the cycle, the less cash you need tied up to keep the business running.
The formula
Cash Conversion Cycle = Days Inventory Outstanding + Days Sales Outstanding − Days Payable Outstanding.
- Days Inventory Outstanding (DIO): how long inventory sits before it sells
- Days Sales Outstanding (DSO): how long it takes customers to pay after a sale
- Days Payable Outstanding (DPO): how long you take to pay your own suppliers
A shorter DIO and DSO, and a longer DPO, all shrink the cycle, which is exactly the point: you want to sell fast, collect fast, and pay slow, within the bounds of a healthy vendor relationship.
A worked example
A small retailer holds inventory for 45 days on average (DIO), takes 20 days to collect from customers (DSO), and pays suppliers in 30 days (DPO). Cash Conversion Cycle = 45 + 20 − 30 = 35 days. That means, on average, cash is tied up for 35 days between paying for inventory and getting paid for it.
Why this number matters
A 35-day cycle means you need enough cash reserves or credit to cover 35 days of operations before your own sales replenish it. Shrink that number and you free up cash without changing your revenue at all, it's one of the few improvements that's purely operational.
How to shorten it
- Reduce DIO: order inventory more frequently in smaller batches instead of large infrequent orders; identify and discount slow-moving stock
- Reduce DSO: shorten payment terms, invoice immediately, offer small early-payment discounts, or use invoice factoring for the slowest-paying accounts
- Increase DPO: negotiate longer terms with reliable suppliers, but don't push this to the point of damaging the relationship or losing early-payment discounts that are worth more than the extra days
Where this fits into the bigger picture
The cash conversion cycle is really just a formal way of measuring the same gap covered in accounts receivable and payable management. If you're already tracking receivable aging and payment terms, you're most of the way to improving this number without extra work. For the full operational picture, see the complete guide to small business cash flow management.