Published Last updated Written and reviewed by the Resale Intelligence team
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True profit = revenue actually received − every cost of that device. Look at profit per day as well, because cash tied up for a long time has a cost.
Which costs do you need to deduct before counting profit?
Besides the purchase price, deduct repairs, battery swaps, parts and screen film, shipping to and from the repair shop, card and marketplace fees, discounts and promotions, and staff commission. These costs are easy to forget and make the profit in your head look higher than it is.
What remains after every cost is that device's True profit.
Example: two units with the same profit that aren't equal
| Unit A | Unit B | |
|---|---|---|
| Sold for | 20,000 | 20,000 |
| Total cost | 16,200 | 16,200 |
| True profit | 3,800 | 3,800 |
| Sold in | 10 days | 60 days |
| Profit per day | 380 | 63 |
Device A brings your cash back to buy new stock six times faster, while device B leaves it as Capital tied up for longer.
How do margin, ROI and profit per day differ?
Margin is true profit divided by revenue, ROI is true profit divided by total cost, and profit per day is true profit divided by the days you held the device. The last one tells you how fast your cash turns over.
- Margin = True profit ÷ revenue
- ROI = True profit ÷ total cost
- Profit per day = True profit ÷ days held
The app records every cost in a per-unit ledger and calculates these automatically. Learn more in Inventory Intelligence