Availability Formula Calculator
Calculate system availability from MTBF and MTTR values. Use the standard availability formula A = MTBF / (MTBF + MTTR) for SRE planning.
Free Reliability Calculators
16 toolsUptime, SLA, MTTR, and error budget calculators. Browse our free reliability tools below — no sign-up required.
Change Failure Rate Calculator
Calculate change failure rate from failed and total deployments. Classify your DORA tier and benchmark software delivery quality.
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.
Failure Rate Calculator
Calculate failure rate (lambda) from operating hours and failures. Convert between failure rate, MTBF, and FIT rate for reliability.
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.
MTBF Calculator (Mean Time Between Failures)
Calculate Mean Time Between Failures for repairable systems. Measure system reliability from operating hours and failure count.
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.