API Response Time Calculator

Estimate your endpoint's theoretical response time by summing database queries, external API calls, cache lookups, and processing overhead. Spot bottlenecks before they hit production.

Latency Sources

Add each operation in your request pipeline with its count and average latency.

@ms

= 15ms

@ms

= 200ms

@ms

= 2ms

@ms

= 10ms

Overhead

Network round-trip (ms)

Serialization / middleware (ms)

Estimated Response Time

252ms

Good

Under 300ms. Acceptable for most user-facing APIs.

Breakdown

Database queries (3×5ms)15ms

External API calls (1×200ms)200ms

Cache lookups (Redis) (2×1ms)2ms

Business logic / CPU (1×10ms)10ms

Network overhead20ms

Serialization / middleware5ms

Total252ms