Joel Martinez Seattle

The Circus · 04

The Math of Sales

An interactive calculator for outbound: exactly what it takes — dials, conversations, meetings — to hit a revenue goal by cold calling.

Interactive Vanilla JS Live
Open the calculator

The idea

Cold-calling plans are usually built on vibes — "just make more calls." But it's arithmetic. Start from a revenue number and work backward through every conversion rate, and you get the one thing that actually matters: how many dials a day this goal requires. Most of the time the answer is either reassuring or brutally clarifying.

What I built

A single-page calculator that runs the funnel in reverse: revenue goal → deals needed → meetings → conversations → dials. Every conversion rate is a live slider, so you can see instantly how a two-point swing in connect rate changes the daily workload — or whether the target is even reachable with the headcount you have.

No framework, no dependencies. It loads instantly and does the whole computation in the browser.