# Speed vs revenue calculator

Estimate how much revenue you gain by making pages or checkout faster.

## How it works

Each extra 100 ms lowers conversion by a small, compounding share. Speeding up raises it by the same rule, applied to your sessions and order value.

```
conversion at target = conversion × (1 + loss)^(Δms ÷ 100)
```

## Questions

### Is 1% per 100 ms right for us?

It’s a widely quoted rule of thumb. Your own data, from comparing fast and slow sessions, is better.

### Which page matters most?

Usually checkout and product pages: delays there sit right before the money.

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