Marketing tools

The math behind the dashboard.

Free calculators for the marketing decisions worth running real numbers on. UTM builder live now, more shipping over the next few weeks.

Tools

UTM builder

Tag campaign URLs for Google Analytics, Mixpanel, Amplitude. The five standard UTM fields, with shareable templates.

ROAS calculator

Return on ad spend with break-even ROAS for any margin. Most '4× ROAS!' announcements are unprofitable below 30% margin.

CPC + CPM calculator

Cost per click + cost per thousand impressions, plus CTR cross-conversion. Useful for comparing channels.

Profit margin

Cost / price → margin %, plus markup. Reverse mode: target margin → required price.

Payment fee calculator

Net after fees for Stripe / PayPal / Square. Inverse: what to charge to net $X. Custom rates supported.

Conversion rate calculator

Conversions / visitors → conversion rate with Wilson score 95% CI. Honest math for small samples.

Why a hub for these?

Most marketing calculators are gated behind a signup, an email, or a popup. The math is trivial — these are five-line formulas most marketers know — but the UX of every "free" calculator adds friction. We're shipping the same calculations as one-tab static pages, no signup, no email gate, nothing about what you computed sent anywhere.

For each tool we'll also ship the explanation of when the single-number answer is useful versus misleading — most of these formulas have edge cases that the calculators that own this space gloss over.

Don't see the tool you need?

Request a tool — 30-second form straight to the founder. No marketing list, no data tracking, no upsell.