[API reference](https://evolu.dev/docs/api-reference) › [@evolu/common](https://evolu.dev/docs/api-reference/common) › [Schedule](https://evolu.dev/docs/api-reference/common/Schedule) › exponential

```ts
function exponential(
  base: Duration,
  factor?: number,
): Schedule<
  number &
    Brand<"Int"> &
    Brand<"NonNegative"> &
    Brand<"LessThan281474976710655"> &
    Brand<"Millis">
>;
```

Defined in: [packages/common/src/Schedule.ts:239](https://github.com/evoluhq/evolu/blob/e7144e2bbe9069362b62dec1b64a8aa922b8f1b0/packages/common/src/Schedule.ts#L239)

Exponential backoff schedule.

Computes delay as `base * factor^(attempt - 1)`:

- Attempt 1: `base`
- Attempt 2: `base * factor`
- Attempt 3: `base * factor²`
- ...

Never stops — combine with [take](https://evolu.dev/docs/api-reference/common/Schedule/functions/take) or [maxElapsed](https://evolu.dev/docs/api-reference/common/Schedule/functions/maxElapsed) to limit.

### Example

```ts
// 100ms, 200ms, 400ms, 800ms, ...
const exp = exponential("100ms");

// 100ms, 150ms, 225ms, 338ms, ... (gentler growth)
const gentle = exponential("100ms", 1.5);
```