Ecommerce Discount Stack & Promotion Margin Guardrail Planner

Model how stacked discounts, coupons, shipping subsidies and merchant-entered fees affect contribution margin before a promotion goes live. Working data stays in your browser.

Use boundary: use your own lawful pricing and cost assumptions. Do not coordinate competitor pricing, create deceptive reference prices, or treat these calculations as tax, accounting or consumer-law certification.

Store profile

Store / brandPromotion ownerDefault contribution-margin floor (%)

Promotion scenario register

$89 one-time

Secure live-mode Stripe checkout. All prices are in U.S. dollars.

Buy with Stripe — $89

Margin leak planner · Packaging cost planner · Revenue Store