What is a latency budget?

A latency budget is the maximum time allocated for a request to travel through your entire system — from the client through all microservices, databases, and external APIs back to the client. It ensures your system meets its SLA (Service Level Agreement) target.

How is the p95 latency estimated?

The p95 estimate uses a configurable multiplier (default 1.4x) applied to the median total latency. In real systems, tail latencies are typically 1.3x to 2x higher than median due to garbage collection, network jitter, connection pool exhaustion, and other factors.

How does the cache hit rate affect latency?

The cache hit rate reduces the effective database latency proportionally. For example, a 60% cache hit rate means only 40% of requests hit the database, reducing the DB contribution to total latency by 60%. This is calculated as: effective_db_time = db_time × (1 - cache_hit_rate / 100).

Is my data sent to any server?

No. All calculations run entirely in your browser using client-side JavaScript. No data is sent to any server. You can verify this in your browser's network tab.

Engineering-Grade Latency Planning

Model Your
Latency Budget

Can your system meet a 200ms SLA? Model microservice chains, caching, network hops, and tail latency to find out — before you ship.

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Path Modeling

Configure services, network hops, DB queries, and external APIs to model a real request path.

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SLA Verdict

Instant SLA compliance check with headroom analysis, p95 estimates, and bottleneck detection.

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What-If Analysis

Simulate horizontal scaling, cache tuning, retry amplification, and traffic spikes.

Configuration

Target SLA

Services in Path

Avg Service Time

Network per Hop

DB Query Time

Cache Hit Rate

External API

p95 Multiplier

Estimated Latency

201ms

SLA Violated

Headroom

<1ms

p95 Estimate

281ms

SLA Violated

Latency Breakdown

Service Processing125ms(62.2%)

Network Hops40ms(19.9%)

Database (cache-adjusted)16ms(8.0%)

External API20ms(10.0%)

Primary Bottleneck

Service Processing

Budget Allocation

Component	Latency	% of SLA
Processing	125ms	62.5%
Network	40ms	20.0%
Database	16ms	8.0%
External API	20ms	10.0%
Total	201ms	100.5%

Frequently Asked Questions

Everything you need to know about Latency Budget Calculator.

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Path Modeling

SLA Verdict

What-If Analysis

Frequently Asked Questions

Model Your
Latency Budget