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Free retail-arbitrage calculator
Know the buy price—not just the hopeful profit.
Model every known cost, your budget, your required return, and three selling-price drops. ShelfSignal calculates while you type.
Live inputs
Current numbers
Budget and buy rules
Meets your math rules
Estimated profit / unit
$12.50
ROI
59%
Net margin
25%
Planned units
4
Math only. Confirm the exact product, eligibility, demand, price, fees, returns, and shelf stock before buying.
Decision prices
- Maximum buy price for your targets
- $23.72
- Break-even Amazon price
- $35.29
- Landed cost / unit
- $21.29
- Amazon referral fee
- $7.50
- Other modeled fees
- $8.70
Budget outcome
Investment
$85.16
Estimated total profit
$50.00
If Amazon price drops
−5%
$10.38
profit / unit
−10%
$8.25
profit / unit
−20%
$4.00
profit / unit
This calculator provides estimates, not profit guarantees or legal, tax, financial, inventory, or marketplace-eligibility advice.