Uptime, SLA, MTTR, and error budget calculators. Browse our free reliability tools below — all calculators are instant, accurate, and require no sign-up.
Change Failure Rate Calculator — Calculate change failure rate from failed and total deployments. Classify your DORA tier and benchmark software delivery quality.
Availability Formula Calculator — Calculate system availability from MTBF and MTTR values. Use the standard availability formula A = MTBF / (MTBF + MTTR) for SRE planning.
Composite SLA Calculator — Calculate composite availability for dependent services. Multiply individual SLAs to find true end-to-end system availability.
Deployment Frequency Calculator — Calculate deployment frequency and classify your DORA tier. Convert total deployments over a period into daily, weekly, and monthly rates.
DORA Metrics Calculator — Classify your team as Elite, High, Medium, or Low using all four DORA metrics. Measure deployment frequency, lead time, CFR, and MTTR.
Downtime Duration Calculator — Calculate exact downtime duration from uptime percentage and time period. Convert availability to hours, minutes, and seconds of downtime.
Error Budget Burn Rate Calculator — Calculate how fast your error budget is being consumed. Determine burn rate, time to exhaustion, and set multi-window alert thresholds.
Error Budget Calculator — Calculate your SRE error budget from SLO targets. Convert reliability objectives into allowed downtime minutes per month, quarter, and year.
Lead Time for Changes Calculator — Calculate lead time for changes from commit to deploy. Classify your DORA tier and optimize your software delivery pipeline speed.
Failure Rate Calculator — Calculate failure rate (lambda) from operating hours and failures. Convert between failure rate, MTBF, and FIT rate for reliability.
MTTF Calculator (Mean Time to Failure) — Calculate Mean Time to Failure from total operating hours and number of failures. Essential for non-repairable component reliability analysis.
MTTR Calculator (Mean Time to Repair) — Calculate Mean Time to Repair from total repair time and number of repairs. Measure and improve your incident resolution speed.
Service Recovery Time Calculator — Calculate service recovery time from incident detection to resolution. Classify your DORA restoration tier and benchmark recovery speed.
SLA Availability Calculator — Calculate service availability percentage from total time and downtime. Verify SLA compliance and track uptime performance metrics.
Uptime Nines Calculator — Convert availability nines (99.9%, 99.99%) to allowed downtime per year, month, week, and day. Plan SLA targets accurately.