How to Track Reselling Profit: Tools and Methods That Actually Work
Learn how to accurately track your reselling profits using spreadsheets, apps, and simple formulas. Stop guessing and start knowing your real numbers.
Why Most Resellers Do Not Know Their Real Profit
Ask a reseller how much they made last month and you will often hear their gross sales number. But gross sales and actual profit are very different things. Between platform fees, shipping costs, cost of goods, supplies, and mileage, many resellers overestimate their profits by 30-50% or more.
Tracking profit accurately is the single most important habit separating hobby sellers from profitable businesses.
The Profit Formula Every Reseller Needs
For every item you sell, the formula is:
Net Profit = Sale Price - Cost of Goods - Platform Fees - Shipping Cost - Supplies Cost
For your business overall, also subtract:
- Monthly subscriptions (eBay Store, cross-listing tools, etc.)
- Mileage and gas for sourcing trips
- Storage costs
- Returns and refunds
Method 1: Spreadsheet Tracking
A simple spreadsheet is the most flexible and free option. Create columns for:
| Column | Description |
|---|---|
| Date Listed | When you listed the item |
| Date Sold | When it sold |
| Platform | eBay, Poshmark, Mercari, etc. |
| Item Description | Brief description for your reference |
| Cost of Goods | What you paid for the item |
| Sale Price | Final selling price |
| Platform Fees | Commission + processing fees |
| Shipping Cost | Postage and label cost |
| Supplies | Packaging materials used |
| Net Profit | Calculated automatically |
Set up a formula in the Net Profit column that subtracts all costs from the sale price. At the end of each month, sum the Net Profit column for your true monthly earnings.
Spreadsheet Tips
- Log items when you buy them, not when they sell. This helps you track unsold inventory and calculate your invested capital
- Use conditional formatting to highlight items that have been listed for over 60 days — these are candidates for price drops or relisting
- Create a separate tab for monthly summaries showing total revenue, total costs, and net profit trends over time
Method 2: Dedicated Reselling Apps
Several apps are built specifically for reseller profit tracking:
- My Reseller Genie: Popular among eBay and Poshmark sellers. Tracks cost of goods, fees, shipping, and calculates profit per item
- SellerToolkit: Designed for eBay sellers with automatic fee calculations
- Resell Calendar: Simple daily tracking with monthly reporting
- AceBudget: General expense tracker that can be adapted for reselling
The advantage of apps is automation — many pull sales data directly from your marketplace accounts, calculate fees automatically, and generate reports.
Method 3: Accounting Software
For full-time resellers or anyone who wants proper bookkeeping, accounting software provides the most complete picture:
- Wave (free): Basic invoicing and expense tracking
- QuickBooks Self-Employed: Connects to bank accounts, tracks mileage, and categorizes expenses for tax filing
- Hurdlr: Designed for gig workers and freelancers, good for mileage and expense tracking
Key Metrics to Monitor
Beyond per-item profit, track these business health metrics:
Average Profit Per Item
Your total monthly profit divided by items sold. If this number drops, you are either sourcing lower-quality inventory or not accounting for rising costs.
Sell-Through Rate
Items sold divided by total items listed. A healthy sell-through rate is 30-50% per month. Below 20% suggests pricing problems or undesirable inventory.
Return on Investment (ROI)
Net profit divided by cost of goods, expressed as a percentage. Aim for 100% ROI or higher — meaning you at least double your money on every item. Lower ROI items may not be worth your time.
Days to Sell
Average number of days from listing to sale. Shorter is better. If items sit for over 90 days, consider repricing or moving them to a different platform.
The Weekly Check-In
Set aside 15 minutes each week to review your numbers. Update your tracker, reconcile any missing entries, and look for patterns. Are certain categories more profitable? Is one platform outperforming another? Are your sourcing trips yielding good inventory?
This small investment of time prevents profit leaks and keeps your business pointed in the right direction.