# How I compare benchmark results with ratios

A beginner-friendly guide to comparing measured values, fastest result, ratios, and avoiding misleading benchmark conclusions.

- Date: 2026-09-27
- URL: https://ilham.dev/posts/how-to-compare-benchmark-results-with-ratios/
- Markdown: https://ilham.dev/posts/how-to-compare-benchmark-results-with-ratios/index.md
- Tags: benchmark, performance, math, tools
- Reading time: 2 min


Benchmark comparison is easier when every result is compared against the fastest or baseline value.

The [Benchmark Builder](/tools/benchmark-builder/) tool handles the repetitive part so I can focus on checking whether the result makes sense.

## The simple idea

Benchmark comparison is easier when every result is compared against the fastest or baseline value.

I still treat the output as something to review, especially when it affects money, dates, privacy, or production data.

## Step 1: Enter each measured value

Enter each measured value.

## Step 2: Label each result clearly

Label each result clearly.

## Step 3: Choose whether lower or higher is better

Choose whether lower or higher is better.

## Step 4: Compare ratios, not only raw differences

Compare ratios, not only raw differences.

## Step 5: Repeat measurements before trusting tiny differences

Repeat measurements before trusting tiny differences.

## Step 6: Watch for warmup, cache, and background load effects

Watch for warmup, cache, and background load effects.

## Step 7: Use benchmarks to guide decisions, not to prove more than they measured

Use benchmarks to guide decisions, not to prove more than they measured.

## My checklist

Before I trust the result, I check:

- Enter each measured value.
- Label each result clearly.
- Choose whether lower or higher is better.
- Compare ratios, not only raw differences.
- Repeat measurements before trusting tiny differences.
- Watch for warmup, cache, and background load effects.
- Use benchmarks to guide decisions, not to prove more than they measured.

A small tool is most useful when it makes the work visible and easy to verify.