Live month-pulse desk for logos churned ÷ start, with leak-vs-fill peel, flat-book companion, and half-life / lifespan strip.
Planning sketch only. Not GAAP/IFRS metrics, audited reporting, or investment advice. Align cohort definitions with your finance team.
By Ahmet C. Toplutaş·Site owner & editor · Business tools
Last updated May 21, 2026 · Reviewed May 21, 2026 · Planning estimates only - not tax, medical, or investment advice
01
Monthly logo churn asks what share of the starting month cohort left before the next billing cycle. The desk leads with that pulse: churned ÷ start, with a retain mirror underneath.
This page's framing is a month-pulse desk, with a leak-vs-fill peel, a flat-book companion, and a half-life / lifespan strip. It is not annual churn's ÷12-compound peel hero, not gross churn's any-period annualize + survival mirror, not retention's true↔naive twin, and not revenue-dollar churn.
Decision framing: “How hard did we leak this month, did fill cover it, and how fast would the cohort halve if the pulse held?”
Planning sketch only. Not GAAP/IFRS metrics, audited reporting, tax advice, or investment advice. Align cohort definitions with your finance team. See our disclaimers.
02
Leak is logos churned. Fill is new logos. End book ≈ retained + new. Net logo change can be positive while monthly churn still looks painful. Acquisition does not rewrite the pulse; it only changes whether the book grows.
Tip: load Leak month. Fill trails churned, so the end book shrinks even with “some” new logos.
03
To hold ending logos near the start (logos only), new logos must at least match logos churned. Fill gap = new − needed. A negative gap is a shrinking book; a positive gap is growth capacity after replacing the leak.
This is a month operations check, not NDR and not expansion revenue. When dollars and upgrades matter, hand off to revenue churn or NDR boards.
04
If the monthly rate held, half-life is the months until about half the starting cohort remains: ln(0.5) / ln(1 − c). Simple lifespan ≈ 1 / c months is a rough mean-lifetime cue used in back-of-envelope CLV talk.
Optional ARPA sketches month revenue-at-risk as churned × ARPA only. It is not a full revenue-churn model. Year-scale compound vs naive ÷12 teaching lives on annual churn; lifetime value depth lives on CLV.
05
Month pulse, flat book, and half-life.
Example: 30 lost of 1,000 → 3% month. Flat needs 30 new. Half-life ≈ 22.8 months; simple lifespan ≈ 33.3 months.
06
Sibling boards when the job is year-scale, any-period gross, keep-rate, or dollars.
07
Scenario A: SaaS 3%. 30 of 1,000 leave; 55 new arrive. Pulse is 3% while fill gap is +25 and the book grows.
Load Sticky: 1.2% month. Half-life stretches; use it when coaching “quiet” leak risk.
Scenario B: Leak month. New logos trail churned. Flat-book companion shows a negative fill gap before anyone celebrates “we still acquired.”
Scenario C: Critical 10%. Half-life collapses toward single-digit months. Hand off to retention and CLV when lifetime value decisions matter.
Scenario D: Need year math. Take the monthly pulse to annual churn for compound vs naive ÷12 pedagogy on a year cohort.
08
09
10
Stop here for native month logo pulse, leak vs fill, and half-life cues. Hand off for year-scale ÷12 teaching, any-period gross annualize, keep-rate twins, dollar churn, or CLV.
11
It closes a month-pulse desk for logos churned ÷ starting logos in the month, peels leak vs fill (churned vs new), checks how many new logos would hold the book flat, and shows a half-life / simple lifespan strip if the monthly rate held.
Monthly logo churn is the share of the starting month cohort that left during the month. New logos do not reduce the churn rate; they appear in the leak-vs-fill peel and flat-book companion.
To keep ending logos equal to start (before other effects), new logos must at least match logos churned. Fill gap = new − churned. Negative gap means the book shrinks even if acquisition looks busy.
Half-life is months until about half the starting cohort would remain if the monthly churn rate held: ln(0.5) / ln(1 − c). Simple lifespan ≈ 1 / c months is a rough mean-lifetime cue. Deep CLV lives on the CLV calculator; year-scale ÷12 pedagogy lives on annual churn.
Annual owns year-cohort loss and the compound-monthly vs naive ÷12 trap. Gross owns any-period gross rate with annualize and survival mirrors. Retention owns keep-rate with a true↔naive twin. This page owns the native month pulse, leak vs fill, and flat-book / half-life literacy.
No. Optional ARPA only sketches month revenue-at-risk as churned × ARPA. Dollar churn and NDR boards own expansion-aware revenue stories.
No. It is a planning sketch only. Not GAAP/IFRS metrics, audited reporting, or investment advice. Align definitions with your finance team. See our disclaimers.
LIVE MONTH-PULSE BOARD
Month pulse →Scene presets
Fill side of the peel
Month revenue-at-risk cue
MONTH-PULSE DESK
Monthly logo churn
3.00%
30 lost ÷ 1,000 start · retain mirror 97.00%
LEAK VS FILL PEEL
Churn % stays leak ÷ start. Fill can grow the book without repairing the pulse.
FLAT-BOOK COMPANION
Flat means end ≈ start from logos alone. Expansion revenue is out of scope here.
HALF-LIFE / LIFESPAN STRIP
Year-scale ÷12 depth: annual churn. CLV depth: CLV.
Updates as you type. Share writes board state; typing does not rewrite the address bar.
Monthly logo churn
3.00%
Fill gap +25 · half-life 22.8 mo
Monthly logo churn is the share of the starting month cohort that left. New logos can grow the end book without lowering that pulse; the flat-book companion shows how much fill you needed just to hold steady.
Copy the link to save or share your results.