Margin Ruler

Margin Leak Calculator

Calculates your actual margin after fees and shipping, and the minimum price required to hit your target margin. Flags products that are losing money or r…

Amazon FBA is active. Other marketplace modules stay marked as planned until audited.

Published fee inputs, dated assumptionsNo account or emailPrivate unless you save
Methodology

Margin Leak Calculator. Estimates per-order margin after product cost, platform fees, and shipping, then compares the result to a target margin.

Fee basis: source-state planning estimate; modeled fee basis is under review and not a Seller Central reconciliation. Last source-state review: 2026-06-07.

Source-state status

planning estimate. Planning estimate — fee basis is source-dated and under review, not a Seller Central reconciliation.

Modeled in the estimate

  • fba fulfillment fee 2026 — Planning estimate: this fee basis is not independently primary-source verified (secondary_only) and its source date has passed. Treat as directional, not a Seller Central reconciliation. report_mode
  • referral fee 2026 — Planning estimate: this fee basis is not independently primary-source verified (secondary_only) and its source date has passed. Treat as directional, not a Seller Central reconciliation. report_mode

Review the Amazon seller-fee source-state register →

Read the formula, inclusions, exclusions, and fee-category audit →

Calculator
Inputs
Enter your operating figures for a planning estimate based on published rate cards and industry midpoints.
We may earn a commission if you click a vendor link. External vendors are independent third parties.
Result
Fill in your operating figures above to get a planning estimate.

Worked example

Example inputs: $39.99 price, $12 cost, $5 shipping, 15% platform fees, 30% target margin

Actual margin $16.99 per order (42.5%) — hitting the 30% target needs a $30.91 price, a $9.08 gap.

  • Dominant cost driver: Largest cost: Revenue net of fees ($33.99)
  • Decision threshold: Minimum price for the 30% target margin: $30.91.
  • Sensitivity: Margin status, largest cost leak, target-margin price floor, max COGS, and margin sensitivity to fee changes.
OptionResult
Revenue net of fees$33.99
Unit cost (COGS)$12.00
Platform fees$6.00
Shipping$5.00

Example inputs — your own numbers will differ. A planning estimate, not a quote.

How this is calculated

Estimates per-order margin after product cost, platform fees, and shipping, then compares the result to a target margin.

Formula: actual_margin = selling_price - platform_fees - product_cost - shipping_cost; target_price = (product_cost + shipping_cost) / (1 - platform_fee_pct - target_margin_pct)

Fee basis: Fee schedule/source date: generic marketplace fee model verified 2026-05-08.

Margin Leak Calculator

Use this Margin Leak Calculator tool to estimate costs and plan next steps. This hub explains how to use the tool, what affects estimates, and where to go next. Below are the most common drivers people see for this kind of job.

What typically drives the estimate

  • Net revenue per order and gross margin percent
  • Order discount and promo code usage rate
  • Price-match events and manual override frequency
  • Chargeback and refund losses not captured elsewhere

Related pages

Disclosure: Affiliate disclosure: We may earn a commission when you engage a vendor through links on this site. This does not affect the price you pay or the cost estimates shown, which are calculated independently of vendor relationships. Calculator results are planning estimates only — not financial guarantees.

Canonical: https://www.marginruler.com/tool/margin-leak-calculator/

Review vendors before committing — no obligation.

Worked example

Example inputs: $39.99 price, $12 cost, $5 shipping, 15% platform fees, 30% target margin

Actual margin $16.99 per order (42.5%) — hitting the 30% target needs a $30.91 price, a $9.08 gap.

  • Dominant cost driver: Largest cost: Revenue net of fees ($33.99)
  • Decision threshold: Minimum price for the 30% target margin: $30.91.
  • Sensitivity: Margin status, largest cost leak, target-margin price floor, max COGS, and margin sensitivity to fee changes.
OptionResult
Revenue net of fees$33.99
Unit cost (COGS)$12.00
Platform fees$6.00
Shipping$5.00

Example inputs — your own numbers will differ. A planning estimate, not a quote.

How this is calculated

Estimates per-order margin after product cost, platform fees, and shipping, then compares the result to a target margin.

Formula: actual_margin = selling_price - platform_fees - product_cost - shipping_cost; target_price = (product_cost + shipping_cost) / (1 - platform_fee_pct - target_margin_pct)

Fee basis: Fee schedule/source date: generic marketplace fee model verified 2026-05-08.

Margin Leak Calculator

Use this Margin Leak Calculator tool to estimate costs and plan next steps. This hub explains how to use the tool, what affects estimates, and where to go next. Below are the most common drivers people see for this kind of job.

What typically drives the estimate

  • Net revenue per order and gross margin percent
  • Order discount and promo code usage rate
  • Price-match events and manual override frequency
  • Chargeback and refund losses not captured elsewhere

Related pages

Disclosure: Affiliate disclosure: We may earn a commission when you engage a vendor through links on this site. This does not affect the price you pay or the cost estimates shown, which are calculated independently of vendor relationships. Calculator results are planning estimates only — not financial guarantees.

Canonical: https://www.marginruler.com/tool/margin-leak-calculator/

Regional pages

Regional Margin Leak Calculator pages

Use the regional margin-leak pages when fee mix, promo discipline, shipping cost, or return behavior may change by selling market. The local pages keep the same leak-audit logic while anchoring the planning check to a regional context. Browse below; the calculator math is the same on each regional planning page.

Australia

Canada

New Zealand

United States