changefailurerate.com

Change failure rate calculator: 90-day window

The quarterly cadence. Statistically powerful, freshness-adverse.

OW
Oliver Wakefield-Smith
Founder, Digital Signet. Built siemcost / monitoringcost / itbudgetcalculator.
Updated 21 Jun 2026
Direct answer
90-day windows are appropriate for quarterly board reporting and low-deploy teams (under 5 deploys per week). They mirror the DORA survey cadence DORA 20242024 but lag tactical signal by up to 8 weeks.
Window:
0%25%50%+
14.3%
37th percentile vs 2025 DORA distribution
42
Failed
334
Total deploys
across 90 day window
Annual engineering burn at this CFR
$186,960/yr
Customer-impact churn estimate: $447,720/yr at 35% customer-facing failure rate.

Where your team plots vs DORA cohort

CFR (y) by deploys per week (x). Elite teams sit bottom-right: high throughput, low failure.

0%10%20%30%40%010204060youdeploys per weekCFR %
elite cohort high medium low your team

Would a DORA vendor pay back at this CFR?

Assumes a 40% CFR reduction (the published Sleuth median, scaled). Quote-only vendors do not display a per-seat rate.

Sleuth
pricing source
Free tier (up to 10 developers, basic DORA metrics)
Vendor / mo
$4,500
Burn saved / mo
$6,232
Payback
0.7 mo
LinearB
pricing source
Essentials $29/user/month (annual, includes 1,000 credits)
Vendor / mo
$5,220
Burn saved / mo
$6,232
Payback
0.8 mo
Jellyfish
pricing source
Quote-only (typical deals $30K-$100K+ ARR)
Quote-only vendor. We do not infer per-seat rates for this site; contact sales for a published number.
Faros AI
pricing source
Faros CE: free self-hosted. Faros AI hosted: contact sales.
Quote-only vendor. We do not infer per-seat rates for this site; contact sales for a published number.
DX
pricing source
Quote-only (positioning to 500+ engineer orgs)
Quote-only vendor. We do not infer per-seat rates for this site; contact sales for a published number.
Swarmia
pricing source
$20/developer/month (published)
Vendor / mo
$3,600
Burn saved / mo
$6,232
Payback
0.6 mo
Pluralsight Flow (Appfire)
pricing source
Quote-only (Appfire-managed)
Quote-only vendor. We do not infer per-seat rates for this site; contact sales for a published number.
Haystack
pricing source
Quote-only (per developer)
Quote-only vendor. We do not infer per-seat rates for this site; contact sales for a published number.

The staleness trade-off

A 90-day CFR is structurally stable but slow to reflect change. If you ship a CI improvement on day 1, the headline metric will not fully reflect it until day 90. Pair the 90-day with a 30-day trailing window to keep tactical signal alive.

Board-deck framing

For a Series-C board deck: report the 90-day headline number, the 30-day trend line, and the DORA percentile band. Anchor "improvement vs prior quarter" against the rolling 90-day so the comparison is apples-to-apples DORA 2024 Report2024.

Continue reading