Amazon profit margin calculator for sellers. Calculate cost breakdowns, profit margins, break-even points, and get pricing recommendations. Supports single product analysis and batch calculations. Input product cost, shipping, FBA fees, and get instant profitability analysis. No API key required.
SkillScore82Maintained
Automatic
◆Finance & Accounting pack
Last verified 8/19/2026
What it changes
Passed 18 of 22 test cases with the skill, and 10 of 22 without it.
Without skill45%
With skill82%
Checks it passed that the model alone missed
The default return rate applied is 3%.
The assigned profitability status is Danger.
The assigned profitability status is Warning.
and 7 more in the full report
8 fixed10 passed either way4 still failing0 broke
Pass-rate lift
+36 pp
Tokens
+96%
Agent turns
0%
Response time
-9%
Model gemini-3.6-flashMeasured 8/19/2026v118 of 22 cases passed with skill
Tokens, turns and time describe resource use, not a dollar price.
See it in action
One of 8 test cases the skill fixed. Same model, same prompt, with and without the skill.
1 of 8
Prompt
What default return rate percentage is applied to estimate return handling losses when the user provides no historical return data?
What was checked, without and with the skill
Checked
Without skill
With skill
The default return rate applied is 3%.
Missed
Passed
case-18 · gemini-3.6-flash · 8/19/2026 · answers are capped and redacted
What's inside
The instructions your model reads when the skill loads.
SKILL.md236 lines2 filesincludes scripts
Profit Margin Calculator — Amazon 💰
Calculate product profitability for Amazon FBA sellers — cost breakdowns, profit margins, break-even analysis, and pricing recommendations. No API key required.