Blended CAC
LiveWhat is a new customer genuinely costing you to win?
Free operator calculators
Free calculators for the numbers your board keeps circling
Work out payback period, contribution margin, net revenue retention, and every other subscription number that matters from seed through pre-IPO. No signup. No email gate. No drip sequence afterwards. Just the figure — measured against real operating companies.
Acquisition
Retention
Net Revenue Retention
LiveAre the accounts you already have getting more valuable, or quietly shrinking?
Churn Velocity
LiveHow quickly is the base actually leaking each quarter?
Growth & Efficiency
Lifetime Value
LiveWhat is a single account worth across the whole relationship?
LTV to CAC
LiveAre you compounding efficiently or buying growth on credit?
MRR Bridge
LivePull a defensible monthly recurring figure in seconds.
ARR Snapshot
LiveWhat is your real annualized run rate this month?
Rule of 40
SoonDoes growth plus margin clear the bar yet?
Valuation Range
SoonWhat would the company fetch if you sold it this quarter?
Payback Period
SoonHow many months until this spend earns itself back?
Budget Split
SoonWhat should next year's demand budget actually look like?
Search & Content
Content ROI
LiveWhat is a full year of search investment returning?
Search Cost
SoonHow much should a programme of this size actually cost?
Why we made these calculators free
Most metric calculators sit behind an email gate or hand back a bare number with no context. We built ours the other way round. Every tool ships with benchmark bands drawn from operating companies between $3M and $60M in recurring revenue — so the output means something. You see where you land against peers, not just a figure on a screen.
We run these same tools inside our own client engagements. When a growth lead needs a payback number before a board session, or a finance partner wants a quick LTV:CAC sanity check, these are what we open. Now they are free for anyone building a subscription business.
Every input carries a note explaining itself — what counts as demand spend, how to treat annual versus monthly contracts, when to use blended rather than channel-level numbers. The goal is a defensible figure in well under a minute, not an afternoon in a spreadsheet.
How each tool runs the maths
Blended acquisition cost
The CAC calculator takes total sales and demand spend, divides by net new customers won, and returns your blended acquisition cost. It also splits out channel-level figures so paid can be read against organic and outbound. Benchmark bands then show whether that ratio is healthy for your stage and contract size.
Lifetime value
The LTV calculator uses average contract value, gross margin, and churn to estimate what each account returns over the relationship. Pair it with the LTV:CAC calculator to see whether you are compounding or simply spending. A ratio under 3:1 usually means acquisition is outrunning returns.
What we are building next
Rule of 40, valuation range, and search cost modelling land next, using 2026 public comparables by stage and revenue band. Each one follows the same pattern: honest inputs, peer benchmarks, and a clear output you can take straight into a finance review or a board deck.
Built by the halfmoon growth team. Used in our own client work. Free for anyone building a subscription business.