Apdex Score Calculator
Calculate your Application Performance Index (Apdex) score from satisfied, tolerating, and frustrated user counts with a custom threshold.
Free Performance Calculators
19 toolsLatency, throughput, and page speed calculators. Browse our free performance tools below — no sign-up required.
Bandwidth Calculator
Calculate required bandwidth from file size, concurrent transfers, and time window. Plan network capacity for file-heavy applications.
Cache Hit Ratio Calculator
Calculate cache hit ratio from hits and misses. Measure caching efficiency and estimate the performance benefit of your cache layer.
CDN Hit Ratio Calculator
Calculate CDN cache hit ratio and origin offload percentage. Measure how effectively your CDN serves content from edge locations.
Concurrent Users Calculator
Estimate concurrent active users from session data. Calculate simultaneous users from active sessions, duration, and time period.
Connection Pool Sizing Calculator
Calculate optimal database connection pool size from concurrent requests, query time, and overhead. Prevent pool exhaustion and optimize resources.
Core Web Vitals Calculator
Check your Core Web Vitals scores against Google thresholds. Evaluate LCP, FID/INP, and CLS values for good, needs improvement, or poor.
Database Query Optimization Calculator
Calculate query optimization improvement percentage and annual time savings. Measure the impact of database query tuning on performance.
Download & Upload Time Calculator
Calculate file download and upload time from file size, bandwidth, and protocol overhead. Estimate transfer times for any connection speed.
GC Pause Impact Calculator
Calculate garbage collection overhead and throughput impact. Estimate the percentage of runtime spent in GC and effective application throughput.
Latency Percentiles Calculator
Calculate latency percentiles (p50, p90, p95, p99) from response time samples. Understand your service latency distribution for SLOs.
Lighthouse Score Estimator
Estimate your Lighthouse performance score from FCP, SI, LCP, TBT, and CLS metrics using official scoring weights for version 10+.
Load Test Sizing Calculator
Calculate target virtual users and ramp-up plans for load tests. Size your performance tests from peak concurrent users with safety factors.
Page Load Time Estimator
Estimate total page load time from page weight, bandwidth, DNS, TLS, TTFB, and render time. Plan optimization targets for faster pages.
Page Response Time Impact Calculator
Calculate how page load latency affects revenue and conversions. Estimate revenue loss per second of added delay for your website.
Page Weight Calculator
Calculate total page weight from HTML, CSS, JS, images, fonts, media, and third-party resources. Optimize your page size for faster loads.
Requests Per Second Calculator
Calculate average and peak requests per second from total requests and time period. Estimate peak RPS with configurable multipliers.
Thread Pool Sizing Calculator
Calculate optimal thread pool size for CPU-bound and I/O-bound workloads. Use the cores+1 and wait/service ratio formulas for accurate sizing.
Throughput Capacity Calculator
Calculate max throughput using Little's Law from average response time and concurrent workers. Plan server capacity for peak loads.