---
category: Utilities
---

# useToNumber

Reactively convert a string ref to number.

## Usage

```ts
import { useToNumber } from '@vueuse/core';
import { shallowRef } from 'vue';

const str = shallowRef('123');
const number = useToNumber(str);

number.value; // 123
```

## Type Declarations

```ts
export interface UseToNumberOptions {
  /**
   * Method to use to convert the value to a number.
   *
   * Or a custom function for the conversion.
   *
   * @default 'parseFloat'
   */
  method?: 'parseFloat' | 'parseInt' | ((value: string | number) => number);
  /**
   * The base in mathematical numeral systems passed to `parseInt`.
   * Only works with `method: 'parseInt'`
   */
  radix?: number;
  /**
   * Replace NaN with zero
   *
   * @default false
   */
  nanToZero?: boolean;
}
/**
 * Reactively convert a string ref to number.
 *
 * @__NO_SIDE_EFFECTS__
 */
export declare function useToNumber(
  value: MaybeRefOrGetter<number | string>,
  options?: UseToNumberOptions,
): ComputedRef<number>;
```