Tool • Calculator
Profit Calculator
Enter buy price and sell price to calculate profit, margin, and ROI. Useful for shop/management games like Discounty.
Last updated: 2026-02-27
Source: Formula-based, user input
Inputs
Results
Profit
$0.00
Margin
0%
ROI (profit / buy)
0%
Formula
profit = sell − buy − fees
margin = profit ÷ sell
ROI = profit ÷ buy
Edge cases
- If sell = 0, margin is shown as 0% (no sale price to base it on).
- If buy = 0, ROI is shown as 0% (avoid divide-by-zero).
- If fees > (sell − buy), profit becomes negative (the deal loses money).
How to use
Use this calculator to quickly check whether a flip, craft, or shop item is worth selling. Enter your buy price, your sell price, and any optional fees/taxes. We calculate profit (net gain), margin (profit as a % of sell price), and ROI (profit relative to buy price) so you can compare deals consistently across different price points.
Example
Buy $10, sell $15, fees $3 → profit $2, margin 13.3%, ROI 20%.
If fees rise, profit drops first—so ROI is usually the fastest “is this worth it?” check.
FAQ
What’s the difference between margin and ROI?
Margin uses sell price as the base. ROI uses buy price as the base. ROI is better for comparing flips.
Why can profit be negative?
If fees/taxes exceed your spread (sell − buy), the deal loses money. Try lowering fees or raising sell price.
Does this save my inputs?
No—inputs are calculated locally in your browser. (We can add “save presets” later if needed.)