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BillNode

billnode.app

Shopify DTC margin and break-even ROAS calculator. Built for operators who scale on ROAS but need to see true profitability — after refunds, fees, VAT, and chargebacks.

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Why it was built

Most Shopify DTC operators optimise for ROAS. The problem: ROAS ignores refunds, chargebacks, payment processing fees, shipping costs, and VAT treatment. A campaign with a 2x ROAS can still be unprofitable once you account for real costs.

BillNode gives operators a single place to enter their actual monthly numbers and see the true picture: net margin, break-even ROAS, and a clear verdict — profitable or not.

What it does

Eleven inputs cover every major cost variable in a Shopify DTC operation:

  • Monthly revenue and COGS
  • Ad spend
  • Shipping cost
  • Refund and return rate
  • Chargeback rate
  • Payment processing fees
  • VAT rate and recovery
  • Monthly fixed costs
  • Target margin

Outputs: true net profit, true net margin %, break-even ROAS, estimated order count, and a verdict badge — profitable, marginal, or loss-making.

Architecture

Deliberately simple. The entire tool is a single HTML file — no framework, no server, no dependencies, no build step. Open it in a browser and it works. All computation is deterministic and local-only — no data is sent anywhere.

This makes it trivially deployable: host it on any static provider, embed it in an existing site, or bundle it inside a Shopify app.

Who it's for

  • DTC agencies building client reporting or onboarding tools
  • Shopify app developers looking for a profitable-calculator feature
  • Ecommerce educators and course creators
  • Media buyers who want to validate campaign profitability before scaling
  • Operators who want a clean, embeddable tool with their own branding
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