The TidyCalc Blog

CAC is just spend ÷ customers, so there are only two ways to lower it: spend less or convert more. Here are seven levers that actually move the number, and how to measure each.

Revenue alone won't tell you whether a subscription business is healthy. Five metrics — MRR, ARR, churn, CAC payback and LTV:CAC — reveal whether growth compounds or quietly leaks away.

You can have a high ROAS and still lose money. These four metrics — ROAS, LTV, CAC and conversion rate — work together to tell you whether your marketing actually pays.

ROI is the most quoted number in business — and the most misused. Here's how to calculate it correctly, and why a 'bigger' ROI sometimes means a worse investment.

Before you fall in love with a listing, run the numbers. The 28/36 rule is the quickest way to find a home price that won't stretch your budget — here's how it works.

Cubic yards or bags? How thick? When to call the ready-mix truck? Here's everything a first-timer needs to estimate concrete without over-ordering.

Three simple ideas — area, volume and coverage — are behind almost every 'how much do I need?' question. Master them once and you'll never over- or under-buy again.