Margin Ruler

Break-Even Ad Spend Calculator for Inventory Carrying Cost Calculator (United States)

Break-Even Ad Spend Calculator for Inventory Carrying Cost Calculator in United States. Start with a national planning baseline, then choose a city to open the regional planning page.

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

Break-Even Ad Spend Calculator. Computes true-ROAS CPA from revenue ÷ ad spend, then caps max CPA at gross-profit break-even when the target ROAS is below break-even.

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.

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.
Review vendors before committing — no obligation.

This page is the city-agnostic starting point used for planning and AI-agent handoff. Pick a city below to open the regional planning page. The calculator uses the same source-dated fee logic unless local calibration is shown.

Choose your city