Live year-cohort bridge so annual logo loss never pretends annual ÷ 12 is the true monthly rate.
Educational SaaS metrics sketch. Not financial, investment, audit, or investor advice. Define whether year-end mixes new logos before you ship the number.
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
Annual logo churn answers one sharp question: of the customers on the book at the start of the year, what share was gone by year-end? Retention is the complement. That year-scale story is how boards and annual planning talk about stickiness when a single month is too noisy or too local.
This page’s framing is year-cohort logos vs monthly compounding. The cohort bridge shows start, lost, and end. The compound monthly peel shows the steady monthly rate that would reproduce that year. A monthly churn calculator owns a single-period snapshot; here we own the year book and the honest bridge back.
Keep the definition clean. Prefer remaining start-of-year logos at year-end, not a total that quietly mixes new signups. Mixing new logos into “end” understates attrition and turns the bridge into marketing theater.
Decision framing: “Are we measuring the year-start book that left, or only last month’s cancels?”
02
The unique affordance is the compound monthly peel beside the cohort bridge. If annual retention is R (end ÷ start), the monthly retention that compounds to that year is R to the power of 1/12. Monthly churn is one minus that root. Load SaaS B2B, then Healthy book, and watch annual churn move while the peel keeps the year and the month in the same story.
That is a different job from a tip equal-versus-fair twin board or a sleep cycle ladder. Here the product is attrition literacy across time scales, not seats vs plates and not wake anchors.
Keep start and end fixed. Read compound monthly next to annual churn. That pair is the product.
03
A common shortcut divides annual churn by twelve and calls it “monthly.” That naive ÷12 ignores compounding. Losing a steady share of the remaining book each month means the constant monthly rate that reproduces a given year is slightly higher than annual/12, not lower.
The panel shows both numbers and the undershoot in percentage points. Use the gap as a teaching moment in standups: same year, different monthly claim. When someone pastes annual/12 into a model, the peel is the correction.
04
Logo churn is a count story. Dollars are another. Optional ARPA (average revenue per account, annual) turns lost logos into a revenue-at-risk sketch: lost × ARPA. It is a back-of-envelope pressure number, not contracted ARR, refunds, seats, or expansion offsets.
When logo loss looks mild but ARPA is high, the dollar sketch lights up. When you lose many small accounts, logos hurt more than dollars. For true dollar attrition and expansion, hand off to revenue churn and net revenue retention.
05
Annual logo churn is lost customers over the year-start book when end is at or below start. Retention is end over start. Compound monthly comes from the twelfth root of retention. Naive monthly is annual churn divided by twelve.
If end exceeds start, the panel treats the book as net growth on this simple definition, not “negative churn.” Define whether end mixes new logos before you celebrate.
06
After year-cohort literacy, hand off for single-month snapshots, dollar churn, retention complements, and expansion-aware retention.
07
Scenario A: SaaS B2B. Start 1,000, end 850, ARPA $12,000. Annual churn lands near 15%. Compound monthly is lower than 15% ÷ 12. Revenue at risk is 150 × $12,000. A familiar mid-market pressure band for many B2B books, not a universal grade.
Flip to Healthy book without changing how you read the peel. Watch annual and compound monthly both ease while the naive undershoot pattern stays visible.
Scenario B: Healthy book. Start 500, end 460. About 8% annual loss. Use this when you want a calmer year cohort for planning literacy, then stress with Turnaround.
Scenario C: B2C mid. Start 2,000, end 1,500, lower ARPA. Logos move hard; dollars may look smaller than B2B. Pair with revenue churn before you declare the business “fine.”
Scenario D: Turnaround. Start 800, end 560. Roughly 30% annual logo loss. The peel still refuses naive ÷12. This is when retention programs and product-market fit debates get louder than spreadsheet optimism.
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Stop here for year-cohort logo literacy and the compound bridge. Hand off when the question is a single month, dollar attrition, or expansion-aware retention.
11
It measures logo attrition on a year-start cohort: customers lost by year-end divided by customers at the start of the year. Retention is the share still on the book. It is a simple year-scale sketch, not a full SaaS board pack.
If annual retention is R, the compound monthly retention is R^(1/12). Monthly churn is 1 minus that root. Dividing annual churn by 12 ignores compounding and usually understates the constant monthly rate that would reproduce the year.
Monthly churn answers a single-month snapshot. This page owns the year cohort and the compound bridge back to a monthly equivalent. Use monthly when you are reading one period; use annual when the question is year-scale retention pressure.
For a clean logo-churn cohort, year-end should be the remaining start-of-year accounts (or enter start and lost so end = start minus lost). Mixing new logos into end understates attrition. Revenue churn and NRR tools handle expansion and contraction dollars.
Lost logos times the ARPA you enter. It is a back-of-envelope dollar sketch for the same attrition story, not contracted ARR, refunds, or expansion offsets.
Industry bands differ (B2B SaaS often targets much lower logo loss than consumer apps). Pair logo churn with revenue churn and net revenue retention before you celebrate. This page does not grade your category for you.
No. It is an educational business-metrics sketch. Board reporting, audits, and fundraising packs need your finance team and defined cohort rules, not this panel alone.
LIVE COHORT
Compound bridge →Scene preset
Prefer remaining start-of-year logos, not a total that mixes new signups.
COHORT BRIDGE
Start
1,000
Lost
150
End
850
Annual churn
15.00%
Retention
85.00%
COMPOUND MONTHLY PEEL
Naive understates compound by 0.10% pts. Same year story; different monthly claim.
Updates as you type. Share writes the URL; typing does not. Educational SaaS sketch, not financial or audit advice.
Annual logo churn
15.00%
Watch band · retention 85.00%
Annual churn is lost logos over the year-start book. The compound monthly peel shows the steady monthly rate that would reproduce this year. Do not use annual ÷ 12 as that monthly rate.
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