About

206 free calculators for the decisions DTC operators actually make — ROAS, contribution margin, LTV:CAC, Amazon fees, BFCM prep. Built so you stop rebuilding the same spreadsheet every quarter.

Who's behind it

A small group of performance marketers and DTC operators. We use these calculators in our own work, which is the only reason they exist.

How we keep it honest

• Free, forever. No signup to use any tool. No paywall on results. No "premium tier".
• Your numbers stay in your browser. Inputs are encoded in the URL only if you click Share — never sent to a server.
• Reviewed regularly. Platform-fee calcs (Amazon, Shopify, Klaviyo) get a quarterly check; durable-econ calcs (ROAS, LTV:CAC) annually. Each page shows when it was last reviewed.
• Funded by affiliate links to tools we already use (Klaviyo, ShipBob, etc.). Never sponsored placements, never a recommendation we don't actually stand behind.

Spot something wrong?

Calculation off, benchmark out of date, missing a tool you'd use? Tell us. Most fixes ship within a few days.

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