Amazon Store ROI Simulator
Edit assumptions → see monthly profit, ROI, payback, and IRR.
Reset defaults
Inputs
Assumptions are editable
Upfront setup / buy-in (one-time)
Starting inventory / working capital
Cash reserve (buffer)
Monthly gross sales
Returns / refunds rate (of gross sales)
COGS rate (of net sales)
Marketplace fees rate (of net sales)
Fulfillment / shipping rate (of net sales)
Ad spend rate (of gross sales)
Fixed monthly OpEx
Your share of profit (profit split)
Projection horizon (months)
Longer horizons make IRR more informative.
Monthly sales growth rate (optional)
Use negative growth to stress test.
Results
Total capital deployed
Your total profit
Avg monthly profit (you)
ROI (you)
Payback period
IRR (annualized)
Tip: Stress test by increasing returns/fees/ad spend and lowering sales.
Projection table
Mo
Gross
Net Sales
Pre-Mgmt Profit
Your Profit
Cum. Your Profit
Note: This tool is an estimator based on inputs. Results vary and are not guarantees.