Developer Experience Tools
Inner Loop Time Calculator
Enter inner loop time, iteration count, and team size to compute daily wasted time and annual cost of a slow development feedback cycle.
No data is transmitted — everything runs locallyTool
Example — Representative default scenario — build min 3 · test min 6 · runs per day 18.
Daily loop time/dev
150 min
90s × 100 iterations
Team monthly loss
825 hrs
15 engineers × 22 days
Annual cost
$1,485,000
at $150/hr loaded
If optimized to 10s
17 min/day
benchmark inner loop target
About this tool
Inner Loop Time Calculator
The Inner Loop Time Calculator computes daily wasted time, annual engineering cost, and flow state impact from inner loop duration and iteration frequency.
• Quantify daily time lost to a 90-second build cycle
• Calculate annual cost of inner loop slowness across a team
• Build ROI case for investing in faster local builds
• Model time savings from reducing inner loop from 90s to 15s
Affiliate disclosure
Uptime, incident, and on-call management. Better Stack provides status pages, incident management, and on-call scheduling for engineering teams.
View dev loop with Better Stack
External site · Independent provider · We may receive a commission · Not a recommendation
FAQ
What does this tool tell you?
The Inner Loop Time Calculator computes daily wasted time, annual engineering cost, and flow state impact from inner loop duration and iteration frequency.
What affects the result most?
Inner loop: code → build → test → run cycle on local machine — repeated hundreds of times per day. Outer loop: commit → CI → review → deploy — once per feature/fix. Inner loop target: <10s for hot reload, <60s for full rebuild — above 60s breaks flow state.
How should I use the result?
The calculation is deterministic — the same inputs always produce the same output — so the most useful workflow is to vary one input at a time and see which factor moves the result most. That tells you where to focus your attention before committing to a decision.
Related tools