MSMargin Sentinel

Free price and discount check

Know your safe price before you run a sale

Estimate product profit, the lowest safe sale price, and the deepest discount you can offer while keeping your target margin. No CSV, login, or Shopify install required.

How to read the estimate

The calculator treats product cost, shipping, packaging, and the payment percentage as costs for one sale. Break-even ad spend is the amount left before the sale reaches zero estimated profit. Actual net profit can also depend on taxes, returns, duties, subscriptions, and other operating costs.